Repository: browniebroke/django-codemod (language: python)

Issue:
ParserSyntaxError when a module have a "from django.utils import timezone" import 
**Describe the bug**

I'm migrating a medium-sized codebase, and I found this strange behavior: if the code has a "`from django.utils import timezone`" import, a ParserSyntaxError is raised


```bash
$ pre-commit run -a
djcodemod................................................................Failed
- hook id: djcodemod
- exit code: 1

Running codemods: AssignmentTagTransformer, CookieDateTransformer, FixedOffsetTransformer, FloatRangeFormFieldTransformer, FloatRangeModelFieldTransformer, InlineHasAddPermissionsTransformer, ModelsPermalinkTransformer, OnDeleteTransformer, QuerySetPaginatorTransformer, SignalDisconnectWeakTransformer, URLResolversTransformer
Executing codemod...
Finished codemodding 62 files!
 - Transformed 62 files successfully.
 - Skipped 0 files.
 - Failed to codemod 0 files.
 - 0 warnings were generated.
Running codemods: AssignmentTagTransformer, CookieDateTransformer, FixedOffsetTransformer, FloatRangeFormFieldTransformer, FloatRangeModelFieldTransformer, InlineHasAddPermissionsTransformer, ModelsPermalinkTransformer, OnDeleteTransformer, QuerySetPaginatorTransformer, SignalDisconnectWeakTransformer, URLResolversTransformer
Executing codemod...
Codemodding /home/luzfcb/projects/big_project/foobar/tests/test_managers.py
Traceback (most recent call last):
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/base_parser.py", line 152, in _add_token
    plan = stack[-1].dfa.transitions[transition]
KeyError: ReservedString(import)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_cli.py", line 295, in _execute_transform
    output_tree = transformer.transform_module(input_tree)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_command.py", line 88, in transform_module
    tree = self._instantiate_and_run(transform, tree)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_command.py", line 58, in _instantiate_and_run
    return inst.transform_module(tree)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_codemod.py", line 108, in transform_module
    return self.transform_module_impl(tree_with_metadata)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_visitor.py", line 32, in transform_module_impl
    return tree.visit(self)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_nodes/module.py", line 91, in visit
    result = super(Module, self).visit(visitor)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_nodes/base.py", line 235, in visit
    leave_result = visitor.on_leave(self, with_updated_children)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/matchers/_visitors.py", line 512, in on_leave
    retval = CSTTransformer.on_leave(self, original_node, updated_node)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_visitors.py", line 72, in on_leave
    updated_node = leave_func(original_node, updated_node)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/visitors/_add_imports.py", line 393, in leave_Module
    *[
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/visitors/_add_imports.py", line 394, in <listcomp>
    parse_statement(
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/entrypoints.py", line 100, in parse_statement
    result = _parse(
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/entrypoints.py", line 51, in _parse
    result = parser.parse()
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/base_parser.py", line 111, in parse
    self._add_token(token)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/base_parser.py", line 187, in _add_token
    raise ParserSyntaxError(
libcst._exceptions.ParserSyntaxError: Syntax Error @ 1:7.
Incomplete input. Encountered 'import', but expected '.', '...', or 'NAME'.

from  import datetime
      ^

Failed to codemod /home/luzfcb/projects/big_project/foobar/tests/test_managers.py

```


**To Reproduce**



```bash
pipx install "django-codemod==1.5.5"

echo "from django.utils import timezone" > foobar.py

djcodemod run --deprecated-in 1.9 --deprecated-in 1.10 --deprecated-in 1.11 --deprecated-in 2.0 --deprecated-in 2.1 --deprecated-in 2.2 foobar.py

```


**Additional context**


ParserSyntaxError when a module have a "from django.utils import timezone" import 
**Describe the bug**

I'm migrating a medium-sized codebase, and I found this strange behavior: if the code has a "`from django.utils import timezone`" import, a ParserSyntaxError is raised


```bash
$ pre-commit run -a
djcodemod................................................................Failed
- hook id: djcodemod
- exit code: 1

Running codemods: AssignmentTagTransformer, CookieDateTransformer, FixedOffsetTransformer, FloatRangeFormFieldTransformer, FloatRangeModelFieldTransformer, InlineHasAddPermissionsTransformer, ModelsPermalinkTransformer, OnDeleteTransformer, QuerySetPaginatorTransformer, SignalDisconnectWeakTransformer, URLResolversTransformer
Executing codemod...
Finished codemodding 62 files!
 - Transformed 62 files successfully.
 - Skipped 0 files.
 - Failed to codemod 0 files.
 - 0 warnings were generated.
Running codemods: AssignmentTagTransformer, CookieDateTransformer, FixedOffsetTransformer, FloatRangeFormFieldTransformer, FloatRangeModelFieldTransformer, InlineHasAddPermissionsTransformer, ModelsPermalinkTransformer, OnDeleteTransformer, QuerySetPaginatorTransformer, SignalDisconnectWeakTransformer, URLResolversTransformer
Executing codemod...
Codemodding /home/luzfcb/projects/big_project/foobar/tests/test_managers.py
Traceback (most recent call last):
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/base_parser.py", line 152, in _add_token
    plan = stack[-1].dfa.transitions[transition]
KeyError: ReservedString(import)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_cli.py", line 295, in _execute_transform
    output_tree = transformer.transform_module(input_tree)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_command.py", line 88, in transform_module
    tree = self._instantiate_and_run(transform, tree)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_command.py", line 58, in _instantiate_and_run
    return inst.transform_module(tree)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_codemod.py", line 108, in transform_module
    return self.transform_module_impl(tree_with_metadata)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/_visitor.py", line 32, in transform_module_impl
    return tree.visit(self)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_nodes/module.py", line 91, in visit
    result = super(Module, self).visit(visitor)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_nodes/base.py", line 235, in visit
    leave_result = visitor.on_leave(self, with_updated_children)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/matchers/_visitors.py", line 512, in on_leave
    retval = CSTTransformer.on_leave(self, original_node, updated_node)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_visitors.py", line 72, in on_leave
    updated_node = leave_func(original_node, updated_node)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/visitors/_add_imports.py", line 393, in leave_Module
    *[
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/codemod/visitors/_add_imports.py", line 394, in <listcomp>
    parse_statement(
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/entrypoints.py", line 100, in parse_statement
    result = _parse(
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/entrypoints.py", line 51, in _parse
    result = parser.parse()
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/base_parser.py", line 111, in parse
    self._add_token(token)
  File "/home/luzfcb/.cache/pre-commit/repof_bg4wfe/py_env-python3/lib/python3.9/site-packages/libcst/_parser/base_parser.py", line 187, in _add_token
    raise ParserSyntaxError(
libcst._exceptions.ParserSyntaxError: Syntax Error @ 1:7.
Incomplete input. Encountered 'import', but expected '.', '...', or 'NAME'.

from  import datetime
      ^

Failed to codemod /home/luzfcb/projects/big_project/foobar/tests/test_managers.py

```


**To Reproduce**



```bash
pipx install "django-codemod==1.5.5"

echo "from django.utils import timezone" > foobar.py

djcodemod run --deprecated-in 1.9 --deprecated-in 1.10 --deprecated-in 1.11 --deprecated-in 2.0 --deprecated-in 2.1 --deprecated-in 2.2 foobar.py

```


**Additional context**




Discussion / hints:
Hi @luzfcb! Thanks for the report. That's a stange one, I cannot reproduce with the CLI installed in my development environment for the project, however, I'm able to do so if I install django-codemod with pipx, like you do.

I've removed a few options you've used and I tracked down the bug to `--deprecated-in 2.2`, and then to the `FixedOffsetTransformer` codemodder. You'd get the bug with this:

```
djcodemod run --codemod FixedOffsetTransformer foobar.py
```

I'll take a look, but in the meantime you can avoid passing `--deprecated-in 2.2`...
Hi @luzfcb! Thanks for the report. That's a stange one, I cannot reproduce with the CLI installed in my development environment for the project, however, I'm able to do so if I install django-codemod with pipx, like you do.

I've removed a few options you've used and I tracked down the bug to `--deprecated-in 2.2`, and then to the `FixedOffsetTransformer` codemodder. You'd get the bug with this:

```
djcodemod run --codemod FixedOffsetTransformer foobar.py
```

I'll take a look, but in the meantime you can avoid passing `--deprecated-in 2.2`...

Fix patch:
diff --git a/django_codemod/feature_flags.py b/django_codemod/feature_flags.py
new file mode 100644
index 00000000..aeb7b393
--- /dev/null
+++ b/django_codemod/feature_flags.py
@@ -0,0 +1,5 @@
+import os
+
+REPLACE_PARENT_MODULE_IMPORTED = (
+    os.getenv("EXPERIMENTAL_REPLACE_PARENT_MODULE_IMPORTED") == "1"
+)
diff --git a/django_codemod/visitors/base.py b/django_codemod/visitors/base.py
index 909b08d3..8cfb3cf6 100644
--- a/django_codemod/visitors/base.py
+++ b/django_codemod/visitors/base.py
@@ -22,6 +22,8 @@
 from libcst.codemod.visitors import AddImportsVisitor
 from libcst.metadata import ParentNodeProvider, Scope, ScopeProvider
 
+from django_codemod.feature_flags import REPLACE_PARENT_MODULE_IMPORTED
+
 
 class BaseDjCodemodTransformer(ContextAwareTransformer, ABC):
     deprecated_in: Tuple[int, int]
@@ -142,6 +144,8 @@ def _check_import_from_parent(
 
             from parent import module
         """
+        if not REPLACE_PARENT_MODULE_IMPORTED:
+            return None
         # First, exit early if 'import *' is used
         if isinstance(updated_node.names, ImportStar):
             return None
diff --git a/django_codemod/visitors/models.py b/django_codemod/visitors/models.py
index 3d4380f6..1411e97c 100644
--- a/django_codemod/visitors/models.py
+++ b/django_codemod/visitors/models.py
@@ -102,7 +102,7 @@ def decorator_matcher(self):
             return None
         if len(matchers_list) == 1:
             return matchers_list[0]
-        return m.OneOf(*[matcher for matcher in matchers_list])
+        return m.OneOf(*iter(matchers_list))
 
     def visit_FunctionDef(self, node: FunctionDef) -> Optional[bool]:
         for decorator in node.decorators:
@@ -145,7 +145,7 @@ def leave_Return(
             args = (
                 Arg(elem_0.value),
                 Arg(Name("None")),
-                *[Arg(el.value) for el in elem_1_3],
+                *(Arg(el.value) for el in elem_1_3),
             )
             return updated_node.with_changes(
                 value=Call(func=Name("reverse"), args=args)
diff --git a/poetry.lock b/poetry.lock
index 40d2ec5c..0b46f18e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -24,21 +24,21 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "attrs"
-version = "20.3.0"
+version = "21.2.0"
 description = "Classes Without Boilerplate"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
-docs = ["furo", "sphinx", "zope.interface"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
 
 [[package]]
 name = "babel"
-version = "2.9.0"
+version = "2.9.1"
 description = "Internationalization utilities"
 category = "main"
 optional = true
@@ -72,7 +72,7 @@ d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
 
 [[package]]
 name = "certifi"
-version = "2020.12.5"
+version = "2021.5.30"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = true
@@ -88,7 +88,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "click"
-version = "8.0.0"
+version = "8.0.1"
 description = "Composable command line interface toolkit"
 category = "main"
 optional = false
@@ -96,6 +96,7 @@ python-versions = ">=3.6"
 
 [package.dependencies]
 colorama = {version = "*", markers = "platform_system == \"Windows\""}
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
@@ -118,7 +119,7 @@ test = ["flake8 (==3.7.8)", "hypothesis (==3.55.3)"]
 
 [[package]]
 name = "coverage"
-version = "5.3.1"
+version = "5.5"
 description = "Code coverage measurement for Python"
 category = "dev"
 optional = false
@@ -137,7 +138,7 @@ python-versions = ">=3.6, <3.7"
 
 [[package]]
 name = "distlib"
-version = "0.3.1"
+version = "0.3.2"
 description = "Distribution utilities"
 category = "dev"
 optional = false
@@ -161,17 +162,17 @@ python-versions = "*"
 
 [[package]]
 name = "flake8"
-version = "3.8.4"
+version = "3.9.2"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 
 [package.dependencies]
 importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
-pycodestyle = ">=2.6.0a1,<2.7.0"
-pyflakes = ">=2.2.0,<2.3.0"
+pycodestyle = ">=2.7.0,<2.8.0"
+pyflakes = ">=2.3.0,<2.4.0"
 
 [[package]]
 name = "idna"
@@ -191,9 +192,9 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "importlib-metadata"
-version = "3.4.0"
+version = "4.5.0"
 description = "Read metadata from Python packages"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -203,22 +204,22 @@ zipp = ">=0.5"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
 
 [[package]]
 name = "importlib-resources"
-version = "5.1.0"
+version = "5.1.4"
 description = "Read resources from Python packages"
 category = "dev"
 optional = false
 python-versions = ">=3.6"
 
 [package.dependencies]
-zipp = {version = ">=0.4", markers = "python_version < \"3.8\""}
+zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "pytest-black (>=0.3.7)", "pytest-mypy"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-black (>=0.3.7)", "pytest-mypy"]
 
 [[package]]
 name = "iniconfig"
@@ -230,7 +231,7 @@ python-versions = "*"
 
 [[package]]
 name = "isort"
-version = "5.7.0"
+version = "5.8.0"
 description = "A Python utility / library to sort Python imports."
 category = "dev"
 optional = false
@@ -243,17 +244,17 @@ colors = ["colorama (>=0.4.3,<0.5.0)"]
 
 [[package]]
 name = "jinja2"
-version = "2.11.2"
+version = "3.0.1"
 description = "A very fast and expressive template engine."
 category = "main"
 optional = true
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-MarkupSafe = ">=0.23"
+MarkupSafe = ">=2.0"
 
 [package.extras]
-i18n = ["Babel (>=0.8)"]
+i18n = ["Babel (>=2.7)"]
 
 [[package]]
 name = "libcst"
@@ -274,14 +275,14 @@ dev = ["black (==20.8b1)", "codecov (>=2.1.4)", "coverage (>=4.5.4)", "fixit (==
 
 [[package]]
 name = "markdown-it-py"
-version = "1.0.0"
+version = "1.1.0"
 description = "Python port of markdown-it. Markdown parsing, done right!"
 category = "main"
 optional = true
 python-versions = "~=3.6"
 
 [package.dependencies]
-attrs = ">=19,<21"
+attrs = ">=19,<22"
 typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
 
 [package.extras]
@@ -294,11 +295,11 @@ testing = ["coverage", "psutil", "pytest (>=3.6,<4)", "pytest-benchmark (>=3.2,<
 
 [[package]]
 name = "markupsafe"
-version = "1.1.1"
+version = "2.0.1"
 description = "Safely add untrusted strings to HTML/XML markup."
 category = "main"
 optional = true
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+python-versions = ">=3.6"
 
 [[package]]
 name = "mccabe"
@@ -372,7 +373,7 @@ testing = ["beautifulsoup4", "coverage", "docutils (>=0.17.0,<0.18.0)", "pytest
 
 [[package]]
 name = "packaging"
-version = "20.8"
+version = "20.9"
 description = "Core utilities for Python packages"
 category = "main"
 optional = false
@@ -424,7 +425,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pycodestyle"
-version = "2.6.0"
+version = "2.7.0"
 description = "Python style guide checker"
 category = "dev"
 optional = false
@@ -432,7 +433,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pyflakes"
-version = "2.2.0"
+version = "2.3.1"
 description = "passive checker of Python programs"
 category = "dev"
 optional = false
@@ -440,7 +441,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pygments"
-version = "2.7.4"
+version = "2.9.0"
 description = "Pygments is a syntax highlighting package written in Python."
 category = "main"
 optional = false
@@ -456,7 +457,7 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "pytest"
-version = "6.2.1"
+version = "6.2.4"
 description = "pytest: simple powerful testing with Python"
 category = "dev"
 optional = false
@@ -478,7 +479,7 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "2.11.0"
+version = "2.12.1"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
@@ -487,17 +488,18 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 [package.dependencies]
 coverage = ">=5.2.1"
 pytest = ">=4.6"
+toml = "*"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests (==2.0.2)", "six", "pytest-xdist", "virtualenv"]
+testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
 
 [[package]]
 name = "pytest-mock"
-version = "3.5.1"
+version = "3.6.1"
 description = "Thin-wrapper around the mock package for easier use with pytest"
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
 pytest = ">=5.0"
@@ -507,7 +509,7 @@ dev = ["pre-commit", "tox", "pytest-asyncio"]
 
 [[package]]
 name = "pytz"
-version = "2020.5"
+version = "2021.1"
 description = "World timezone definitions, modern and historical"
 category = "main"
 optional = true
@@ -515,7 +517,7 @@ python-versions = "*"
 
 [[package]]
 name = "pyupgrade"
-version = "2.7.4"
+version = "2.19.4"
 description = "A tool to automatically upgrade syntax for newer versions."
 category = "dev"
 optional = false
@@ -526,15 +528,15 @@ tokenize-rt = ">=3.2.0"
 
 [[package]]
 name = "pyyaml"
-version = "5.3.1"
+version = "5.4.1"
 description = "YAML parser and emitter for Python"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
 
 [[package]]
 name = "regex"
-version = "2020.11.13"
+version = "2021.4.4"
 description = "Alternative regular expression module, to replace re."
 category = "dev"
 optional = false
@@ -560,7 +562,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 
 [[package]]
 name = "rich"
-version = "10.0.0"
+version = "10.3.0"
 description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
 category = "main"
 optional = false
@@ -571,14 +573,14 @@ colorama = ">=0.4.0,<0.5.0"
 commonmark = ">=0.9.0,<0.10.0"
 dataclasses = {version = ">=0.7,<0.9", markers = "python_version >= \"3.6\" and python_version < \"3.7\""}
 pygments = ">=2.6.0,<3.0.0"
-typing-extensions = ">=3.7.4,<4.0.0"
+typing-extensions = {version = ">=3.7.4,<4.0.0", markers = "python_version < \"3.8\""}
 
 [package.extras]
 jupyter = ["ipywidgets (>=7.5.1,<8.0.0)"]
 
 [[package]]
 name = "six"
-version = "1.15.0"
+version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
 category = "dev"
 optional = false
@@ -586,8 +588,8 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "snowballstemmer"
-version = "2.0.0"
-description = "This package provides 26 stemmers for 25 languages generated from Snowball algorithms."
+version = "2.1.0"
+description = "This package provides 29 stemmers for 28 languages generated from Snowball algorithms."
 category = "main"
 optional = true
 python-versions = "*"
@@ -625,13 +627,14 @@ test = ["pytest", "pytest-cov", "html5lib", "cython", "typed-ast"]
 
 [[package]]
 name = "sphinx-rtd-theme"
-version = "0.5.1"
+version = "0.5.2"
 description = "Read the Docs theme for Sphinx"
 category = "main"
 optional = true
 python-versions = "*"
 
 [package.dependencies]
+docutils = "<0.17"
 sphinx = "*"
 
 [package.extras]
@@ -663,11 +666,11 @@ test = ["pytest"]
 
 [[package]]
 name = "sphinxcontrib-htmlhelp"
-version = "1.0.3"
+version = "2.0.0"
 description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
 category = "main"
 optional = true
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.extras]
 lint = ["flake8", "mypy", "docutils-stubs"]
@@ -698,7 +701,7 @@ test = ["pytest"]
 
 [[package]]
 name = "sphinxcontrib-serializinghtml"
-version = "1.1.4"
+version = "1.1.5"
 description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
 category = "main"
 optional = true
@@ -710,7 +713,7 @@ test = ["pytest"]
 
 [[package]]
 name = "tokenize-rt"
-version = "4.0.0"
+version = "4.1.0"
 description = "A wrapper around the stdlib `tokenize` which roundtrips."
 category = "dev"
 optional = false
@@ -726,7 +729,7 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "tox"
-version = "3.21.1"
+version = "3.23.1"
 description = "tox is a generic virtualenv management and test command line tool"
 category = "dev"
 optional = false
@@ -749,7 +752,7 @@ testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "psutil (>=5.6.1)", "pytes
 
 [[package]]
 name = "typed-ast"
-version = "1.4.2"
+version = "1.4.3"
 description = "a fork of Python 2 and 3 ast modules with type comment support"
 category = "dev"
 optional = false
@@ -757,7 +760,7 @@ python-versions = "*"
 
 [[package]]
 name = "typing-extensions"
-version = "3.7.4.3"
+version = "3.10.0.0"
 description = "Backported and Experimental Type Hints for Python 3.5+"
 category = "main"
 optional = false
@@ -765,7 +768,7 @@ python-versions = "*"
 
 [[package]]
 name = "typing-inspect"
-version = "0.6.0"
+version = "0.7.1"
 description = "Runtime inspection utilities for typing module."
 category = "main"
 optional = false
@@ -777,7 +780,7 @@ typing-extensions = ">=3.7.4"
 
 [[package]]
 name = "urllib3"
-version = "1.26.2"
+version = "1.26.5"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "main"
 optional = true
@@ -790,7 +793,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
 name = "virtualenv"
-version = "20.3.1"
+version = "20.4.7"
 description = "Virtual Python Environment builder"
 category = "dev"
 optional = false
@@ -810,15 +813,15 @@ testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)",
 
 [[package]]
 name = "zipp"
-version = "3.4.0"
+version = "3.4.1"
 description = "Backport of pathlib-compatible object wrapper for zip files"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "jaraco.test (>=3.2.0)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
 
 [extras]
 docs = ["myst-parser", "Sphinx", "sphinx-rtd-theme"]
@@ -826,7 +829,7 @@ docs = ["myst-parser", "Sphinx", "sphinx-rtd-theme"]
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 python-versions = "^3.6"
-content-hash = "4a935b26de7aadc3c6b37b0634c73692c7480e7de19b3ccf790701b56f82eca3"
+content-hash = "2c7713910448e1ce78b621e57d264f4e337c6c3fce3c25903a3b493c287f1507"
 
 [metadata.files]
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@@ -842,94 +845,96 @@ atomicwrites = [
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+    {file = "zipp-3.4.1.tar.gz", hash = "sha256:3607921face881ba3e026887d8150cca609d517579abe052ac81fc5aeffdbd76"},
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diff --git a/pyproject.toml b/pyproject.toml
index 5670a5bc..c05eb1cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ djcodemod = "django_codemod.cli:djcodemod"
 [tool.poetry.dependencies]
 python = "^3.6"
 click = "<9"
-libcst = "<=0.3.19"
+libcst = "==0.3.19"
 pathspec = ">=0.6,<1"
 rich = "<11"
 


Test patch:
diff --git a/conftest.py b/conftest.py
new file mode 100644
index 00000000..8108e21a
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,8 @@
+import pytest
+
+
+@pytest.fixture()
+def parent_module_import_enabled(mocker):
+    yield mocker.patch(
+        "django_codemod.visitors.base.REPLACE_PARENT_MODULE_IMPORTED", True
+    )
diff --git a/tests/visitors/test_base.py b/tests/visitors/test_base.py
index 4f0758b9..24e396ce 100644
--- a/tests/visitors/test_base.py
+++ b/tests/visitors/test_base.py
@@ -60,6 +60,7 @@ def test_simple_substitution(self) -> None:
         """
         self.assertCodemod(before, after)
 
+    @pytest.mark.usefixtures("parent_module_import_enabled")
     def test_parent_module(self) -> None:
         before = """
             from django.dummy import module
@@ -87,6 +88,7 @@ def test_reference_without_call(self) -> None:
         """
         self.assertCodemod(before, after)
 
+    @pytest.mark.usefixtures("parent_module_import_enabled")
     def test_parent_reference_without_call(self) -> None:
         before = """
             from django.dummy import module
@@ -300,6 +302,7 @@ def test_simple_substitution(self) -> None:
         """
         self.assertCodemod(before, after)
 
+    @pytest.mark.usefixtures("parent_module_import_enabled")
     def test_parent_module(self) -> None:
         before = """
             from django.dummy import module
@@ -313,6 +316,7 @@ def test_parent_module(self) -> None:
         """
         self.assertCodemod(before, after)
 
+    @pytest.mark.usefixtures("parent_module_import_enabled")
     def test_parent_module_with_other(self) -> None:
         before = """
             from django.dummy import other_mod, module
@@ -327,6 +331,7 @@ def test_parent_module_with_other(self) -> None:
         """
         self.assertCodemod(before, after)
 
+    @pytest.mark.usefixtures("parent_module_import_enabled")
     def test_parent_module_import_alias(self) -> None:
         before = """
             from django.dummy import module as django_module
diff --git a/tests/visitors/test_models.py b/tests/visitors/test_models.py
index 1da9d01c..5214e0f7 100644
--- a/tests/visitors/test_models.py
+++ b/tests/visitors/test_models.py
@@ -1,3 +1,4 @@
+import pytest
 from parameterized import parameterized
 
 from django_codemod.visitors.models import (
@@ -369,6 +370,7 @@ class MyThing(Model):
         """
         self.assertCodemod(before, after)
 
+    @pytest.mark.usefixtures("parent_module_import_enabled")
     def test_simple_substitution(self) -> None:
         before = """
             from django.db import models
diff --git a/tests/visitors/test_timezone.py b/tests/visitors/test_timezone.py
index 97fa9340..ceef5420 100644
--- a/tests/visitors/test_timezone.py
+++ b/tests/visitors/test_timezone.py
@@ -75,3 +75,11 @@ def test_with_name_args(self) -> None:
         """
 
         self.assertCodemod(before, after)
+
+    def test_issue_421(self) -> None:
+        before = after = """
+        from django.utils import timezone
+
+        now = timezone.now()
+        """
+        self.assertCodemod(before, after)