Repository: spyder-ide/spyder

Issue:
AttributeError when opening numpy array from OS file explorer
## Description

### What steps will reproduce the problem?

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error prompt when trying to open a numpy file double cliking from file explorer. Spyder application was open at that time.

### Traceback
```python-traceback
Traceback (most recent call last):
  File "C:\Users\Iñaki\AppData\Local\Programs\Spyder\pkgs\spyder\app\mainwindow.py", line 1650, in open_external_file
    self.open_file(fpath, external=True)
  File "C:\Users\Iñaki\AppData\Local\Programs\Spyder\pkgs\spyder\app\mainwindow.py", line 1625, in open_file
    self.variableexplorer.import_data(fname)
AttributeError: 'VariableExplorer' object has no attribute 'import_data'
```

## Versions

* Spyder version: 5.1.3 
* Python version: 3.7.9
* Qt version: 5.12.10
* PyQt5 version: 5.12.3
* Operating System: Windows 10

### Dependencies

```

# Mandatory:
atomicwrites >=1.2.0          :  1.4.0 (OK)
chardet >=2.0.0               :  4.0.0 (OK)
cloudpickle >=0.5.0           :  1.6.0 (OK)
cookiecutter >=1.6.0          :  1.7.3 (OK)
diff_match_patch >=20181111   :  20200713 (OK)
intervaltree                  :  None (OK)
IPython >=7.6.0               :  7.27.0 (OK)
jedi >=0.17.2;<0.19.0         :  0.18.0 (OK)
jsonschema >=3.2.0            :  3.2.0 (OK)
keyring >=17.0.0              :  23.1.0 (OK)
nbconvert >=4.0               :  6.1.0 (OK)
numpydoc >=0.6.0              :  1.1.0 (OK)
paramiko >=2.4.0              :  2.7.2 (OK)
parso >=0.7.0;<0.9.0          :  0.8.2 (OK)
pexpect >=4.4.0               :  4.8.0 (OK)
pickleshare >=0.4             :  0.7.5 (OK)
psutil >=5.3                  :  5.8.0 (OK)
pygments >=2.0                :  2.10.0 (OK)
pylint >=2.5.0;<2.10.0        :  2.9.6 (OK)
pyls_spyder >=0.4.0           :  0.4.0 (OK)
pylsp >=1.2.2;<1.3.0          :  1.2.2 (OK)
pylsp_black >=1.0.0           :  None (OK)
qdarkstyle =3.0.2             :  3.0.2 (OK)
qstylizer >=0.1.10            :  0.2.1 (OK)
qtawesome >=1.0.2             :  1.0.3 (OK)
qtconsole >=5.1.0             :  5.1.1 (OK)
qtpy >=1.5.0                  :  1.11.0 (OK)
rtree >=0.9.7                 :  0.9.7 (OK)
setuptools >=49.6.0           :  57.5.0 (OK)
sphinx >=0.6.6                :  4.1.2 (OK)
spyder_kernels >=2.1.1;<2.2.0 :  2.1.1 (OK)
textdistance >=4.2.0          :  4.2.1 (OK)
three_merge >=0.1.1           :  0.1.1 (OK)
watchdog                      :  2.1.5 (OK)
zmq >=17                      :  22.2.1 (OK)

# Optional:
cython >=0.21                 :  0.29.24 (OK)
matplotlib >=2.0.0            :  3.4.3 (OK)
numpy >=1.7                   :  1.19.3 (OK)
pandas >=1.1.1                :  1.3.2 (OK)
scipy >=0.17.0                :  1.7.1 (OK)
sympy >=0.7.3                 :  1.8 (OK)
```



Discussion:
Hey @haritzi, thanks for reporting. This is a bug and we'll fix it in our next version (5.2.0) to be released in November.

Resolving patch:
diff --git a/spyder/app/mainwindow.py b/spyder/app/mainwindow.py
--- a/spyder/app/mainwindow.py
+++ b/spyder/app/mainwindow.py
@@ -47,7 +47,7 @@
 from qtpy.compat import from_qvariant
 from qtpy.QtCore import (QCoreApplication, Qt, QTimer, Signal, Slot,
                          qInstallMessageHandler)
-from qtpy.QtGui import QColor, QKeySequence, QIcon
+from qtpy.QtGui import QColor, QKeySequence
 from qtpy.QtWidgets import (QApplication, QMainWindow, QMenu, QMessageBox,
                             QShortcut, QStyleFactory)
 
@@ -1593,7 +1593,7 @@ def open_file(self, fname, external=False):
         if encoding.is_text_file(fname):
             self.editor.load(fname)
         elif self.variableexplorer is not None and ext in IMPORT_EXT:
-            self.variableexplorer.import_data(fname)
+            self.variableexplorer.get_widget().import_data(fname)
         elif not external:
             fname = file_uri(fname)
             start_file(fname)


Test patch: