sys.stdout redirection issues

[RyanDion]

Description

What steps will reproduce the problem?

Create a tk window, put a textbox in it and a button that prints. Assign sys.stdout = somefunction that prints to the textbox try stepping through encounter error

Traceback

Exception in comms call get_cwd:
  File "D:\anaconda3\Lib\site-packages\spyder_kernels\comms\commbase.py", line 343, in _handle_remote_call
    return_value = self._remote_callback(
                   ^^^^^^^^^^^^^^^^^^^^^^
  File "D:\anaconda3\Lib\site-packages\spyder_kernels\comms\frontendcomm.py", line 265, in _remote_callback
    saved_stdout_write = current_stdout.write
                         ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'function' object has no attribute 'write'
Exception in comms call get_cwd:
  File "D:\anaconda3\Lib\site-packages\spyder_kernels\comms\commbase.py", line 343, in _handle_remote_call
    return_value = self._remote_callback(
                   ^^^^^^^^^^^^^^^^^^^^^^
  File "D:\anaconda3\Lib\site-packages\spyder_kernels\comms\frontendcomm.py", line 265, in _remote_callback
    saved_stdout_write = current_stdout.write
                         ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'function' object has no attribute 'write'
Exception in comms call get_cwd:
  File "D:\anaconda3\Lib\site-packages\spyder_kernels\comms\commbase.py", line 343, in _handle_remote_call
    return_value = self._remote_callback(
                   ^^^^^^^^^^^^^^^^^^^^^^
  File "D:\anaconda3\Lib\site-packages\spyder_kernels\comms\frontendcomm.py", line 265, in _remote_callback
    saved_stdout_write = current_stdout.write
                         ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'function' object has no attribute 'write'

Versions

• Spyder version: 5.4.3 (conda)
• Python version: 3.11.5 64-bit
• Qt version: 5.15.2
• PyQt5 version: 5.15.7
• 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                              :  2.2.1 (OK)
cookiecutter >=1.6.0                             :  1.7.3 (OK)
diff_match_patch >=20181111                      :  20200713 (OK)
intervaltree >=3.0.2                             :  3.1.0 (OK)
IPython >=7.31.1,<9.0.0,!=8.8.0,!=8.9.0,!=8.10.0 :  8.15.0 (OK)
jedi >=0.17.2,<0.19.0                            :  0.18.1 (OK)
jellyfish >=0.7                                  :  1.0.1 (OK)
jsonschema >=3.2.0                               :  4.17.3 (OK)
keyring >=17.0.0                                 :  23.13.1 (OK)
nbconvert >=4.0                                  :  6.5.4 (OK)
numpydoc >=0.6.0                                 :  1.5.0 (OK)
paramiko >=2.4.0                                 :  2.8.1 (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                                     :  5.9.0 (OK)
pygments >=2.0                                   :  2.15.1 (OK)
pylint >=2.5.0,<3.0                              :  2.16.2 (OK)
pylint_venv >=2.1.1                              :  2.3.0 (OK)
pyls_spyder >=0.4.0                              :  0.4.0 (OK)
pylsp >=1.7.2,<1.8.0                             :  1.7.2 (OK)
pylsp_black >=1.2.0                              :  1.2.1 (OK)
qdarkstyle >=3.0.2,<3.2.0                        :  3.0.2 (OK)
qstylizer >=0.2.2                                :  0.2.2 (OK)
qtawesome >=1.2.1                                :  1.2.2 (OK)
qtconsole >=5.4.2,<5.5.0                         :  5.4.2 (OK)
qtpy >=2.1.0                                     :  2.2.0 (OK)
rtree >=0.9.7                                    :  1.0.1 (OK)
setuptools >=49.6.0                              :  68.0.0 (OK)
sphinx >=0.6.6                                   :  5.0.2 (OK)
spyder_kernels >=2.4.3,<2.5.0                    :  2.4.4 (OK)
textdistance >=4.2.0                             :  4.2.1 (OK)
three_merge >=0.1.1                              :  0.1.1 (OK)
watchdog >=0.10.3                                :  2.1.6 (OK)
zmq >=22.1.0                                     :  23.2.0 (OK)

# Optional:
cython >=0.21                                    :  None (NOK)
matplotlib >=3.0.0                               :  3.7.2 (OK)
numpy >=1.7                                      :  1.24.3 (OK)
pandas >=1.1.1                                   :  2.0.3 (OK)
scipy >=0.17.0                                   :  1.11.1 (OK)
sympy >=0.7.3                                    :  1.11.1 (OK)

[dalthviz]

Hi @RyanDion., sorry for the late response and thank you for the feedback! I think the problem raises since Spyder uses sys.stdout when running from the IPython Console kernel (and your code reassing it then breaks things) 🤔

Maybe @ccordoba12 or @impact27 have some ideas about this? Maybe you have a more in depth explanation about the things that can and can't be done from code that interacts in some way with sys.stdout if run from the Spyder IPython Console?