Repository: spyder-ide/spyder

Issue:
Error when opening Preferences
## Description

### What steps will reproduce the problem?

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I Can't open setting, and it shows spyder has encontered an internal problem

### Traceback
```python-traceback
Traceback (most recent call last):
  File "C:\Users\Admin ACER\AppData\Local\Programs\Spyder\pkgs\spyder\plugins\preferences\plugin.py", line 276, in <lambda>
    lambda: self.open_dialog(main.prefs_dialog_size))
  File "C:\Users\Admin ACER\AppData\Local\Programs\Spyder\pkgs\spyder\plugins\preferences\plugin.py", line 256, in open_dialog
    container.create_dialog(
  File "C:\Users\Admin ACER\AppData\Local\Programs\Spyder\pkgs\spyder\plugins\preferences\widgets\container.py", line 63, in create_dialog
    page.initialize()
  File "C:\Users\Admin ACER\AppData\Local\Programs\Spyder\pkgs\spyder\plugins\preferences\api.py", line 80, in initialize
    self.setup_page()
  File "C:\Users\Admin ACER\AppData\Local\Programs\Spyder\pkgs\spyder\plugins\appearance\confpage.py", line 157, in setup_page
    self.update_combobox()
  File "C:\Users\Admin ACER\AppData\Local\Programs\Spyder\pkgs\spyder\plugins\appearance\confpage.py", line 240, in update_combobox
    combobox.addItem(self.get_option('{0}/name'.format(name)), name)
TypeError: arguments did not match any overloaded call:
  addItem(self, str, userData: Any = None): argument 1 has unexpected type 'float'
  addItem(self, QIcon, str, userData: Any = None): argument 1 has unexpected type 'float'
```

## Versions

* Spyder version: 5.3.2  (standalone)
* Python version: 3.8.10 64-bit
* Qt version: 5.15.2
* PyQt5 version: 5.15.7
* Operating System: Windows 10

### Dependencies

```
# Mandatory:
atomicwrites >=1.2.0                 :  1.4.1 (OK)
chardet >=2.0.0                      :  5.0.0 (OK)
cloudpickle >=0.5.0                  :  2.1.0 (OK)
cookiecutter >=1.6.0                 :  2.1.1 (OK)
diff_match_patch >=20181111          :  20200713 (OK)
intervaltree                         :  None (OK)
IPython >=7.31.1;<8.0.0              :  7.34.0 (OK)
jedi >=0.17.2;<0.19.0                :  0.18.1 (OK)
jellyfish >=0.7                      :  0.9.0 (OK)
jsonschema >=3.2.0                   :  4.7.2 (OK)
keyring >=17.0.0                     :  23.6.0 (OK)
nbconvert >=4.0                      :  6.5.0 (OK)
numpydoc >=0.6.0                     :  1.4.0 (OK)
paramiko >=2.4.0                     :  2.11.0 (OK)
parso >=0.7.0;<0.9.0                 :  0.8.3 (OK)
pexpect >=4.4.0                      :  4.8.0 (OK)
pickleshare >=0.4                    :  0.7.5 (OK)
psutil >=5.3                         :  5.9.1 (OK)
pygments >=2.0                       :  2.12.0 (OK)
pylint >=2.5.0;<3.0                  :  2.14.4 (OK)
pyls_spyder >=0.4.0                  :  0.4.0 (OK)
pylsp >=1.5.0;<1.6.0                 :  1.5.0 (OK)
pylsp_black >=1.2.0                  :  1.2.1 (OK)
qdarkstyle >=3.0.2;<3.1.0            :  3.0.3 (OK)
qstylizer >=0.1.10                   :  0.2.1 (OK)
qtawesome >=1.0.2                    :  1.1.1 (OK)
qtconsole >=5.3.0;<5.4.0             :  5.3.1 (OK)
qtpy >=2.1.0                         :  2.1.0 (OK)
rtree >=0.9.7                        :  1.0.0 (OK)
setuptools >=49.6.0                  :  63.1.0 (OK)
sphinx >=0.6.6                       :  5.0.2 (OK)
spyder_kernels >=2.3.2;<2.4.0        :  2.3.2 (OK)
textdistance >=4.2.0                 :  4.3.0 (OK)
three_merge >=0.1.1                  :  0.1.1 (OK)
watchdog                             :  2.1.9 (OK)
zmq >=22.1.0                         :  23.2.0 (OK)

# Optional:
cython >=0.21                        :  0.29.30 (OK)
matplotlib >=3.0.0                   :  3.5.2 (OK)
numpy >=1.7                          :  1.22.4 (OK)
pandas >=1.1.1                       :  1.4.3 (OK)
scipy >=0.17.0                       :  1.8.1 (OK)
sympy >=0.7.3                        :  1.10.1 (OK)

# Spyder plugins:
spyder_terminal.terminalplugin 1.2.2 :  1.2.2 (OK)
```



Discussion:
Hi @suryaanoragajy thank you for the feedback! Could you share with us your `spyder.ini` file? It should be at `C:\Users\<your user>\spyder-py3\config\spyder.ini`. Also, do you have custom syntax highlighting themes?

Any new info in order to reproduce this on our side is greatly appreciated. Let us know!
Note: I was able to reproduce this by naming a custom syntax highlighting theme with a number

Resolving patch:
diff --git a/spyder/plugins/appearance/confpage.py b/spyder/plugins/appearance/confpage.py
--- a/spyder/plugins/appearance/confpage.py
+++ b/spyder/plugins/appearance/confpage.py
@@ -245,7 +245,12 @@ def update_combobox(self):
 
         # Useful for retrieving the actual data
         for n in names + custom_names:
-            self.scheme_choices_dict[self.get_option('{0}/name'.format(n))] = n
+            # Make option value a string to prevent errors when using it
+            # as widget text.
+            # See spyder-ide/spyder#18929
+            self.scheme_choices_dict[
+                str(self.get_option('{0}/name'.format(n)))
+            ] = n
 
         if custom_names:
             choices = names + [None] + custom_names
@@ -258,7 +263,11 @@ def update_combobox(self):
         for name in choices:
             if name is None:
                 continue
-            combobox.addItem(self.get_option('{0}/name'.format(name)), name)
+            # Make option value a string to prevent errors when using it
+            # as widget text.
+            # See spyder-ide/spyder#18929
+            item_name = str(self.get_option('{0}/name'.format(name)))
+            combobox.addItem(item_name, name)
 
         if custom_names:
             combobox.insertSeparator(len(names))
@@ -379,9 +388,11 @@ def delete_scheme(self):
         if answer == QMessageBox.Yes:
             # Put the combobox in Spyder by default, when deleting a scheme
             names = self.get_option('names')
-            self.set_scheme('spyder')
-            self.schemes_combobox.setCurrentIndex(names.index('spyder'))
-            self.set_option('selected', 'spyder')
+            default_theme = 'spyder'
+            if self.is_dark_interface():
+                default_theme = 'spyder/dark'
+            self.schemes_combobox.setCurrentIndex(names.index(default_theme))
+            self.set_option('selected', default_theme)
 
             # Delete from custom_names
             custom_names = self.get_option('custom_names', [])
diff --git a/spyder/plugins/preferences/api.py b/spyder/plugins/preferences/api.py
--- a/spyder/plugins/preferences/api.py
+++ b/spyder/plugins/preferences/api.py
@@ -241,6 +241,11 @@ def load_from_conf(self):
             data = self.get_option(option, default, section=sec)
             if getattr(lineedit, 'content_type', None) == list:
                 data = ', '.join(data)
+            else:
+                # Make option value a string to prevent errors when using it
+                # as widget text.
+                # See spyder-ide/spyder#18929
+                data = str(data)
             lineedit.setText(data)
             lineedit.textChanged.connect(lambda _, opt=option, sect=sec:
                                          self.has_been_modified(sect, opt))


Test patch: