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ModuleNotFoundError: No module named 'pip'

See original GitHub issue

Environment

pip version: 9.0.3
Python version: 3.6
OS: Windows Server 2016 Datacenter

Description My system admin installed Python 3.6 for me in my AWS workspace and i requested him to update the pip version to 18 but while he was trying to upgrade the version, he ran into error. All below-mentioned commands were executed from a Powershell window in Administrative mode:

Output

PS D:\python\3.6\scripts> pip install --upgrade pip
Collecting pip
  Downloading https://files.pythonhosted.org/packages/5f/25/e52d3f31441505a5f3af41213346e5b6c221c9e086a166f3703d2ddaf940
/pip-18.0-py2.py3-none-any.whl (1.3MB)
    100% |████████████████████████████████| 1.3MB 720kB/s
Installing collected packages: pip
  Found existing installation: pip 9.0.3
    Uninstalling pip-9.0.3:
Exception:
Traceback (most recent call last):
  File "d:\python\3.6\lib\shutil.py", line 544, in move
    os.rename(src, real_dst)
OSError: [WinError 17] The system cannot move the file to a different disk drive: 'd:\\python\\3.6\\scripts\\pip.exe' ->
 'C:\\Users\\sdgadmin\\AppData\\Local\\Temp\\pip-o9ithn08-uninstall\\python\\3.6\\scripts\\pip.exe'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "d:\python\3.6\lib\site-packages\pip\basecommand.py", line 215, in main
  File "d:\python\3.6\lib\site-packages\pip\commands\install.py", line 342, in run
  File "d:\python\3.6\lib\site-packages\pip\req\req_set.py", line 778, in install
  File "d:\python\3.6\lib\site-packages\pip\req\req_install.py", line 754, in uninstall
  File "d:\python\3.6\lib\site-packages\pip\req\req_uninstall.py", line 115, in remove
  File "d:\python\3.6\lib\site-packages\pip\utils\__init__.py", line 267, in renames
  File "d:\python\3.6\lib\shutil.py", line 559, in move
    os.unlink(src)
PermissionError: [WinError 5] Access is denied: 'd:\\python\\3.6\\scripts\\pip.exe'

PS D:\python\3.6\scripts> pip list
Traceback (most recent call last):
  File "d:\python\3.6\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "d:\python\3.6\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "D:\Python\3.6\Scripts\pip.exe\__main__.py", line 5, in <module>
ModuleNotFoundError: No module named 'pip'

PS D:\python\3.6\scripts> pip3 install --upgrade pip
Traceback (most recent call last):
  File "d:\python\3.6\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "d:\python\3.6\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "D:\Python\3.6\Scripts\pip3.exe\__main__.py", line 5, in <module>
ModuleNotFoundError: No module named 'pip'

PS D:\python\3.6\scripts> pip3 install --upgrade pip3
Traceback (most recent call last):
  File "d:\python\3.6\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "d:\python\3.6\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "D:\Python\3.6\Scripts\pip3.exe\__main__.py", line 5, in <module>
ModuleNotFoundError: No module named 'pip'

PS D:\python\3.6\scripts> pip install --upgrade pip
Traceback (most recent call last):
  File "d:\python\3.6\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "d:\python\3.6\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "D:\Python\3.6\Scripts\pip.exe\__main__.py", line 5, in <module>
ModuleNotFoundError: No module named 'pip'

PS D:\python\3.6\scripts> pip.exe install --upgrade pip
Traceback (most recent call last):
  File "d:\python\3.6\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "d:\python\3.6\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "D:\Python\3.6\Scripts\pip.exe\__main__.py", line 5, in <module>
ModuleNotFoundError: No module named 'pip'

Are we doing something wrong here? I also checked few links that suggested using easy_install. I tried that as well but ran into issues.

PS D:\python\3.6\scripts> .\easy_install.exe pip
Searching for pip
Reading https://pypi.python.org/simple/pip/
d:\python\3.6\lib\site-packages\setuptools\pep425tags.py:89: RuntimeWarning: Config variable 'Py_DEBUG' is unset, Python
 ABI tag may be incorrect
  warn=(impl == 'cp')):
d:\python\3.6\lib\site-packages\setuptools\pep425tags.py:93: RuntimeWarning: Config variable 'WITH_PYMALLOC' is unset, P
ython ABI tag may be incorrect
  warn=(impl == 'cp')):
Downloading https://files.pythonhosted.org/packages/5f/25/e52d3f31441505a5f3af41213346e5b6c221c9e086a166f3703d2ddaf940/p
ip-18.0-py2.py3-none-any.whl#sha256=070e4bf493c7c2c9f6a08dd797dd3c066d64074c38e9e8a0fb4e6541f266d96c
error: Download error for https://files.pythonhosted.org/packages/5f/25/e52d3f31441505a5f3af41213346e5b6c221c9e086a166f3
703d2ddaf940/pip-18.0-py2.py3-none-any.whl#sha256=070e4bf493c7c2c9f6a08dd797dd3c066d64074c38e9e8a0fb4e6541f266d96c: [SSL
: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:833)