Spyder: TypeError: 'bool' object is not callable

[pnh81]

Description

What steps will reproduce the problem?

During startup, Spyder4 ('mainwindow.py') reports a type error where mod.PLUGIN_CLASS(self) appears to be calling a bool-type object.

Traceback

  File "c:\program files\python\lib\site-packages\spyder\app\mainwindow.py", line 985, in setup
    plugin = mod.PLUGIN_CLASS(self)
TypeError: 'bool' object is not callable

Versions

• Spyder version: 4.1.0
• Python version: 3.8.0
• Qt version: 5.12.6
• PyQt5 version: 5.12.3
• Operating System: Windows 10

Dependencies

# Mandatory:
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                  :  7.10.1 (OK)
jedi =0.14.1                   :  0.14.1 (OK)
nbconvert >=4.0                :  5.6.1 (OK)
numpydoc >=0.6.0               :  0.9.1 (OK)
paramiko >=2.4.0               :  2.7.0 (OK)
parso =0.5.2                   :  0.5.2 (OK)
pexpect >=4.4.0                :  4.7.0 (OK)
pickleshare >=0.4              :  0.7.5 (OK)
psutil >=5.3                   :  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)
qdarkstyle >=2.8               :  2.8 (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)
sphinx >=0.6.6                 :  2.2.2 (OK)
spyder_kernels >=1.9.0;<1.10.0 :  1.9.0 (OK)
watchdog                       :  None (OK)
zmq >=17                       :  18.1.1 (OK)

# Optional:
cython >=0.21                  :  0.29.15 (OK)
matplotlib >=2.0.0             :  3.2.0 (OK)
numpy >=1.7                    :  1.18.2 (OK)
pandas >=0.13.1                :  1.0.2 (OK)
scipy >=0.17.0                 :  1.4.1 (OK)
sympy >=0.7.3                  :  1.5.1 (OK)

[ccordoba12]

Do you have third-party plugins (like spyder-notebook or spyder-terminal) installed?

[pnh81]

Hi Carlos,

no third-party plugins were/are installed. Apart from the packages listed above, the following are also installed:

opencv-python
opencv-contrib-python
imutils
scikit-image
numba

Hope this helps to narrow down the causes for the issue.

Best,
Peter

[ccordoba12]

This could be a problem with Python 3.8. @dalthviz, please see if you can reproduce this one.

[dalthviz]

Notes:

• Installing using conda in Python 3.8 Spyder doesn't start (blank screen)
• Seems like OP has a conda installation to create the env but uses pip for actually installing the packages (has Qt 5.12.6)
• Maybe the issue is somehow related with pip installations (since #11867 uses pip too)

[pnh81]

Notes:

* Installing using conda in Python 3.8 Spyder doesn't start (blank screen)

* Seems like OP has a conda installation to create the env but uses pip for actually installing the packages (has Qt 5.12.6)

No usage of Conda whatsoever. Installation was done exclusively with pip.

* Maybe the issue is somehow related with pip installations (since #11867 uses pip too)

This appears to be a possible cause. A fresh install yielded the same problem.

[ccordoba12]

@pnh81, thanks for the update.

@dalthviz, please try with pip then.

[arnyeinstein]

I reinstalled with pip, but the problem remains. How can I found out which add-ins I have installed, so I could uninstall them?

[ccordoba12]

That list is available in Help > Dependencies in our 4.1.1 version.

[pnh81]

Update: Spyder 4.1.3 fixed the problem for me.

[ccordoba12]

Really great to hear @pnh81! I think this was caused by us not supporting Python 3.8 on Windows, which was fixed precisely in 4.1.3.

Therefore, I'm going to close this for now (we haven't seen any other reports similar to this one in a while either).