以编程方式从repo安装pip会导致错误“没有这样的文件或目录”

Question

在win 10上，我正在安装py 3.6 venv。从终端

pip install --upgrade git+git://github.com/larochew/py_daemoniker.git@cfd8a669975c217f6df7063be8cb8fbc08b5f0df#egg=daemoniker

工作正常：

Connected to pydev debugger (build 192.5728.105)
  Running command git clone -q git://github.com/larochew/py_daemoniker.git 'C:\Users\user\AppData\Local\Temp\pip-install-g9do107m\daemoniker'
Collecting daemoniker
  Cloning git://github.com/larochew/py_daemoniker.git (to revision cfd8a669975c217f6df7063be8cb8fbc08b5f0df) to c:\users\user\appdata\local\temp\pip-install-g9do107m\daemoniker
  Running command git checkout -q cfd8a669975c217f6df7063be8cb8fbc08b5f0df
Installing collected packages: daemoniker
    Running setup.py install for daemoniker: started
    Running setup.py install for daemoniker: finished with status 'done'
Successfully installed daemoniker-0.2.3

但从代码来看：

try:
    from pip import main as pipmain
except:
    from pip._internal import main as pipmain

pipmain.main(['install', '--upgrade', 'git+git://github.com/larochew/py_daemoniker.git@cfd8a669975c217f6df7063be8cb8fbc08b5f0df#egg=daemoniker'])

结果：

Collecting daemoniker
  Cloning git://github.com/larochew/py_daemoniker.git (to revision cfd8a669975c217f6df7063be8cb8fbc08b5f0df) to c:\users\user\appdata\local\temp\pip-install-64iunozy\daemoniker
  Running command git clone -q git://github.com/larochew/py_daemoniker.git 'C:\Users\user\AppData\Local\Temp\pip-install-64iunozy\daemoniker'
  Running command git checkout -q cfd8a669975c217f6df7063be8cb8fbc08b5f0df
ERROR: Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: 'C:\\Users\\user\\AppData\\Local\\Temp\\pip-req-tracker-qu0hrtol\\9eeeef850bab53900fe60a86b33217ba700f6f3907aadc10a37ed11f'

尽管正常的软件包安装时没有错误

Answer 1

由于我需要在windows下通过代码静默地安装需求，下面的代码做到了这一点：

        subprocess.check_call(
            [executable, '-m', 'pip', 'install', ' upgrade', '-r', config['requirements_file']],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE
        )

如果没有stdout=subprocess.PIPE，来自pip的stdout将转到当前进程。这也不会在win中创建终端。由@sinoroc comment领导的Thnx