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Deleting a Variable

See original GitHub issue

Description

What steps will reproduce the problem?

I ran my program, then wanted to delete a variable in die variable manager manually. Left clickt, then this message popped up.

Used a lot of cpu power, before I got the message in the console: RuntimeWarning: overflow encountered in reduce. Maybe this had something to do with it

Traceback

  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\collectionseditor.py", line 791, in contextMenuEvent
    self.refresh_menu()
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\collectionseditor.py", line 708, in refresh_menu
    self.refresh_plot_entries(index)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\collectionseditor.py", line 713, in refresh_plot_entries
    is_list = self.is_list(key)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\collectionseditor.py", line 1476, in is_list
    return self.var_properties[name]['is_list']
KeyError: 'df_ahs'

Versions

Spyder version: 4.0.0
Python version: 3.7.4
Qt version: 5.9.6
PyQt5 version: 5.9.2
Operating System: Windows 10

Dependencies

cloudpickle >=0.5.0          :  1.2.2 (OK)
pygments >=2.0               :  2.5.2 (OK)
qtconsole >=4.6.0            :  4.6.0 (OK)
nbconvert >=4.0              :  5.6.1 (OK)
sphinx >=0.6.6               :  2.3.0 (OK)
pylint >=0.25                :  2.4.4 (OK)
psutil >=0.3                 :  5.6.7 (OK)
qtawesome >=0.5.7            :  0.6.0 (OK)
qtpy >=1.5.0                 :  1.9.0 (OK)
pickleshare >=0.4            :  0.7.5 (OK)
zmq >=17                     :  18.1.0 (OK)
chardet >=2.0.0              :  3.0.4 (OK)
numpydoc >=0.6.0             :  0.9.1 (OK)
spyder_kernels >=1.8.1;<2.0.0:  1.8.1 (OK)
qdarkstyle >=2.7             :  2.7 (OK)
atomicwrites >=1.2.0         :  1.3.0 (OK)
diff_match_patch >=20181111  :  20181111 (OK)
intervaltree                 :  None (OK)
watchdog                     :  None (OK)
keyring                      :  None (OK)
pexpect >=4.4.0              :  4.7.0 (OK)
pympler                      :  None (OK)
sympy >=0.7.3                :  1.5 (OK)
cython >=0.21                :  0.29.14 (OK)
IPython >=4.0                :  7.10.2 (OK)
matplotlib >=2.0.0           :  3.1.1 (OK)
pandas >=0.13.1              :  0.25.3 (OK)
numpy >=1.7                  :  1.17.4 (OK)
scipy >=0.17.0               :  1.3.2 (OK)
pyls >=0.31.2;<0.32.0        :  0.31.2 (OK)
rtree >=0.8.3                :  0.8.3 (OK)