pip backtrack

[eight04]

I was trying to update prod dependencies of ptt-mail-backup

vpip update uao wcwidth --latest

It is fast while installing packages:

Requirement already satisfied: uao in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (0.1.1)
Collecting uao
  Downloading uao-0.2.0-py3-none-any.whl (229 kB)
     |████████████████████████████████| 229 kB 1.1 MB/s
Installing collected packages: uao
  Attempting uninstall: uao
    Found existing installation: uao 0.1.1
    Uninstalling uao-0.1.1:
      Successfully uninstalled uao-0.1.1
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
ptt-article-parser 0.5.0 requires uao<0.2,>=0.1, but you have uao 0.2.0 which is incompatible.
ptt-mail-backup 0.3.0 requires uao~=0.1.1, but you have uao 0.2.0 which is incompatible.
Successfully installed uao-0.2.0
Requirement already satisfied: wcwidth in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (0.1.9)
Collecting wcwidth
  Downloading wcwidth-0.2.5-py2.py3-none-any.whl (30 kB)
Installing collected packages: wcwidth
  Attempting uninstall: wcwidth
    Found existing installation: wcwidth 0.1.9
    Uninstalling wcwidth-0.1.9:
      Successfully uninstalled wcwidth-0.1.9
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
ptt-mail-backup 0.3.0 requires uao~=0.1.1, but you have uao 0.2.0 which is incompatible.
ptt-mail-backup 0.3.0 requires wcwidth~=0.1.7, but you have wcwidth 0.2.5 which is incompatible.
Successfully installed wcwidth-0.2.5

However, it did a 40 mins backtrack while running pip install -e .

Obtaining file:///C:/Users/eight04/dev/ptt-mail-backup
Requirement already satisfied: paramiko~=2.6 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from ptt-mail-backup==0.3.0) (2.7.2)
Requirement already satisfied: ptt-article-parser~=0.5.0 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from ptt-mail-backup==0.3.0) (0.5.0)
Requirement already satisfied: uao~=0.2.0 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from ptt-mail-backup==0.3.0) (0.2.0)
Requirement already satisfied: wcwidth~=0.2.5 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from ptt-mail-backup==0.3.0) (0.2.5)
Requirement already satisfied: cryptography>=2.5 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from paramiko~=2.6->ptt-mail-backup==0.3.0) (3.4.7)
Requirement already satisfied: pynacl>=1.0.1 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from paramiko~=2.6->ptt-mail-backup==0.3.0) (1.4.0)
Requirement already satisfied: bcrypt>=3.1.3 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from paramiko~=2.6->ptt-mail-backup==0.3.0) (3.2.0)
Requirement already satisfied: cffi>=1.1 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from bcrypt>=3.1.3->paramiko~=2.6->ptt-mail-backup==0.3.0) (1.14.5)
Requirement already satisfied: six>=1.4.1 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from bcrypt>=3.1.3->paramiko~=2.6->ptt-mail-backup==0.3.0) (1.16.0)
Requirement already satisfied: pycparser in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from cffi>=1.1->bcrypt>=3.1.3->paramiko~=2.6->ptt-mail-backup==0.3.0) (2.20)
Requirement already satisfied: safeprint~=0.2.0 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from ptt-article-parser~=0.5.0->ptt-mail-backup==0.3.0) (0.2.0)
Requirement already satisfied: docopt~=0.6.2 in c:\users\eight04\dev\ptt-mail-backup\.venv\lib\site-packages (from ptt-article-parser~=0.5.0->ptt-mail-backup==0.3.0) (0.6.2)
INFO: pip is looking at multiple versions of cryptography to determine which version is compatible with other requirements. This could take a while.
Collecting cryptography>=2.5
  Using cached cryptography-3.4.7-cp36-abi3-win32.whl (1.4 MB)
INFO: pip is looking at multiple versions of <Python from Requires-Python> to determine which version is compatible with other requirements. This could take a while.
  Downloading cryptography-3.4.6-cp36-abi3-win32.whl (1.4 MB)
     |████████████████████████████████| 1.4 MB 1.1 MB/s
  Downloading cryptography-3.4.5-cp36-abi3-win32.whl (1.4 MB)
     |████████████████████████████████| 1.4 MB 3.3 MB/s
  Downloading cryptography-3.4.4-cp36-abi3-win32.whl (1.4 MB)
     |████████████████████████████████| 1.4 MB 6.4 MB/s
  Downloading cryptography-3.4.3-cp36-abi3-win32.whl (1.4 MB)
     |████████████████████████████████| 1.4 MB 3.3 MB/s
  Downloading cryptography-3.4.2-cp36-abi3-win32.whl (1.4 MB)
     |████████████████████████████████| 1.4 MB 6.4 MB/s
  Downloading cryptography-3.4.1-cp36-abi3-win32.whl (1.4 MB)
     |████████████████████████████████| 1.4 MB 6.4 MB/s
Collecting setuptools-rust>=0.11.4
  Downloading setuptools_rust-0.12.1-py3-none-any.whl (22 kB)
INFO: pip is looking at multiple versions of cryptography to determine which version is compatible with other requirements. This could take a while.
Collecting cryptography>=2.5
  Downloading cryptography-3.4-cp36-abi3-win32.whl (1.4 MB)
     |████████████████████████████████| 1.4 MB 6.4 MB/s
INFO: pip is looking at multiple versions of <Python from Requires-Python> to determine which version is compatible with other requirements. This could take a while.
  Downloading cryptography-3.3.2-cp36-abi3-win32.whl (1.3 MB)
...

Ended with the following error:

ERROR: Cannot install cryptography==3.4.7 and paramiko because these package versions have conflicting dependencies.

The conflict is caused by:
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.4.7 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.4.6 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.4.5 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.4.4 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.4.3 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.4.2 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.4.1 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.4 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.3.2 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.3.1 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.3 depends on cffi>=1.12
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.2.1 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.2 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.1.1 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.1 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 3.0 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 2.9.2 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 2.9.1 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 2.9 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 2.8 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 2.7 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 2.6.1 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 2.6 depends on cffi!=1.11.3 and >=1.8
    bcrypt 3.1.3 depends on cffi>=1.1
    cryptography 2.5 depends on cffi!=1.11.3 and >=1.8

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

[eight04]

vpip/vpip/commands/install.py

Lines 86 to 89 in ad6bc73

	if result.incompat_update:
	# rebuild egg file to avoid incompatible errors
	# https://github.com/eight04/vpip/issues/19
	pip_api.install_editable()

Would it help if we don't call pip but setuptools directly?

python setup.py egg_info

It is also interesting that pip didn't backtrack at the first vpip install.