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Error when importing CSV file from Variable tab

See original GitHub issue

Description

What steps will reproduce the problem?

Importing CSV file from Variable tab will thow an error

Traceback

  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 576, in _set_step
    self.text_widget.get_comments())
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 478, in open_data
    skiprows, comments)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 411, in process_data
    comments)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 391, in _shape_text
    from numpy import nan
ImportError: cannot import name 'nan' from 'numpy' (unknown location)
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 576, in _set_step
    self.text_widget.get_comments())
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 478, in open_data
    skiprows, comments)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 411, in process_data
    comments)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 391, in _shape_text
    from numpy import nan
ImportError: cannot import name 'nan' from 'numpy' (unknown location)
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 576, in _set_step
    self.text_widget.get_comments())
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 478, in open_data
    skiprows, comments)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 411, in process_data
    comments)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 391, in _shape_text
    from numpy import nan
ImportError: cannot import name 'nan' from 'numpy' (unknown location)
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 576, in _set_step
    self.text_widget.get_comments())
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 478, in open_data
    skiprows, comments)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 411, in process_data
    comments)
  File "C:\ProgramData\Anaconda3\lib\site-packages\spyder\plugins\variableexplorer\widgets\importwizard.py", line 391, in _shape_text
    from numpy import nan
ImportError: cannot import name 'nan' from 'numpy' (unknown location)

Versions

Spyder version: 4.0.1
Python version: 3.7.5
Qt version: 5.9.6
PyQt5 version: 5.9.2
Operating System: Windows 10

Dependencies

atomicwrites >=1.2.0         :  1.3.0 (OK)
chardet >=2.0.0              :  3.0.4 (OK)
cloudpickle >=0.5.0          :  1.2.2 (OK)
diff_match_patch >=20181111  :  20181111 (OK)
intervaltree                 :  None (OK)
IPython >=4.0                :  7.11.1 (OK)
jedi =0.14.1                 :  0.14.1 (OK)
nbconvert >=4.0              :  5.6.1 (OK)
numpydoc >=0.6.0             :  0.9.2 (OK)
pexpect >=4.4.0              :  4.7.0 (OK)
pickleshare >=0.4            :  0.7.5 (OK)
psutil >=0.3                 :  5.6.7 (OK)
pygments >=2.0               :  2.5.2 (OK)
pylint >=0.25                :  2.4.4 (OK)
pyls >=0.31.2;<0.32.0        :  0.31.2 (OK)
zmq >=17                     :  18.1.0 (OK)
qdarkstyle >=2.7             :  2.7 (OK)
qtawesome >=0.5.7            :  0.6.0 (OK)
qtconsole >=4.6.0            :  4.6.0 (OK)
qtpy >=1.5.0                 :  1.9.0 (OK)
rtree >=0.8.3                :  0.8.3 (OK)
sphinx >=0.6.6               :  2.3.1 (OK)
spyder_kernels >=1.8.1;<2.0.0:  1.8.1 (OK)
watchdog                     :  None (OK)
cython >=0.21                :  None (NOK)
matplotlib >=2.0.0           :  None (NOK)
numpy >=1.7                  :  None (NOK)
pandas >=0.13.1              :  None (NOK)
scipy >=0.17.0               :  None (NOK)
sympy >=0.7.3                :  None (NOK)