Code analysis does not run due to missing 'pathlib'

Description

What steps will reproduce the problem?

1. Load python file into editor.
2. Select “Source->Run code analysis”
3. Receive error-message that an exception was thrown and that pathlib is missing.

Expected behavior: pathlib should be bundled with the Spyder installer.

Traceback

pylint error:

Traceback (most recent call last):
  File "D:\obj\windows-release\37amd64_Release\msi_python\zip_amd64\runpy.py", line 193, in _run_module_as_main
  File "D:\obj\windows-release\37amd64_Release\msi_python\zip_amd64\runpy.py", line 85, in _run_code
  File "C:\prog\spyder\pkgs\pylint\__main__.py", line 9, in <module>
    pylint.run_pylint()
  File "C:\prog\spyder\pkgs\pylint\__init__.py", line 21, in run_pylint
    from pylint.lint import Run as PylintRun
  File "C:\prog\spyder\pkgs\pylint\lint\__init__.py", line 75, in <module>
    from pylint.lint.parallel import check_parallel
  File "C:\prog\spyder\pkgs\pylint\lint\parallel.py", line 7, in <module>
    from pylint import reporters
  File "C:\prog\spyder\pkgs\pylint\reporters\__init__.py", line 25, in <module>
    from pylint import utils
  File "C:\prog\spyder\pkgs\pylint\utils\__init__.py", line 45, in <module>
    from pylint.utils.ast_walker import ASTWalker
  File "C:\prog\spyder\pkgs\pylint\utils\ast_walker.py", line 6, in <module>
    from astroid import nodes
  File "C:\prog\spyder\pkgs\astroid\__init__.py", line 46, in <module>
    from pathlib import Path
ModuleNotFoundError: No module named 'pathlib'

Versions

• Spyder version: 5.0.5
• Python version: 3.7.9
• Qt version: 5.12.10
• PyQt5 version: 5.12.3
• 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           :  1.6.0 (OK)
cookiecutter >=1.6.0          :  1.7.3 (OK)
diff_match_patch >=20181111   :  20200713 (OK)
intervaltree                  :  None (OK)
IPython >=7.6.0               :  7.24.1 (OK)
jedi =0.17.2                  :  0.17.2 (OK)
jsonschema >=3.2.0            :  3.2.0 (OK)
keyring >=17.0.0              :  23.0.1 (OK)
nbconvert >=4.0               :  6.1.0 (OK)
numpydoc >=0.6.0              :  1.1.0 (OK)
paramiko >=2.4.0              :  2.7.2 (OK)
parso =0.7.0                  :  0.7.0 (OK)
pexpect >=4.4.0               :  4.8.0 (OK)
pickleshare >=0.4             :  0.7.5 (OK)
psutil >=5.3                  :  5.8.0 (OK)
pygments >=2.0                :  2.9.0 (OK)
pylint >=1.0                  :  2.8.3 (OK)
pyls >=0.36.2;<1.0.0          :  0.36.2 (OK)
pyls_black >=0.4.6            :  0.4.7 (OK)
pyls_spyder >=0.3.2;<0.4.0    :  0.3.2 (OK)
qdarkstyle =3.0.2             :  3.0.2 (OK)
qstylizer >=0.1.10            :  0.2.0 (OK)
qtawesome >=1.0.2             :  1.0.3 (OK)
qtconsole >=5.1.0             :  5.1.0 (OK)
qtpy >=1.5.0                  :  1.9.0 (OK)
rtree >=0.9.7                 :  0.9.7 (OK)
setuptools >=39.0.0           :  57.0.0 (OK)
sphinx >=0.6.6                :  4.0.2 (OK)
spyder_kernels >=2.0.4;<2.1.0 :  2.0.4 (OK)
textdistance >=4.2.0          :  4.2.1 (OK)
three_merge >=0.1.1           :  0.1.1 (OK)
watchdog                      :  2.1.2 (OK)
zmq >=17                      :  22.1.0 (OK)

# Optional:
cython >=0.21                 :  0.29.23 (OK)
matplotlib >=2.0.0            :  3.4.2 (OK)
numpy >=1.7                   :  1.19.3 (OK)
pandas >=1.1.1                :  1.2.5 (OK)
scipy >=0.17.0                :  1.7.0 (OK)
sympy >=0.7.3                 :  1.8 (OK)

[ccordoba12]

Yeah, please do.

[ccordoba12]

Ok, could you take a look at this before the 5.1.0 release? I hope this is just a matter of including that package in our installer, so it won’t be too difficult.