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如何在 Linux 上识别 python、pip 和安装的模块位置？

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如何在 Linux 上识别 python、pip 和安装的模块位置？

我开始学习Python，但发现在Linux上很难理解。

uname -a
Linux machine-name 4.4.0-31-generic #50~14.04.1-Ubuntu SMP Wed Jul 13 01:07:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

which python
/usr/local/bin/python

which pip
/usr/local/bin/pip

pip --version
/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/primitives/constant_time.py:26: CryptographyDeprecationWarning: Support for your Python version is deprecated. The next version of cryptography will remove support. Please upgrade to a release (2.7.7+) that supports hmac.compare_digest as soon as possible.
  utils.PersistentlyDeprecated2018,
pip 18.1 from /usr/local/lib/python2.7/dist-packages/pip (python 2.7)

python
Python 2.7.16 (default, May  6 2020, 13:05:58) 
[GCC 4.8.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import urllib2
>>> os.path.abspath(urllib2.__file__)
'/usr/local/lib/python2.7/urllib2.pyc'

pip install requests
/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/primitives/constant_time.py:26: CryptographyDeprecationWarning: Support for your Python version is deprecated. The next version of cryptography will remove support. Please upgrade to a release (2.7.7+) that supports hmac.compare_digest as soon as possible.
  utils.PersistentlyDeprecated2018,
Requirement already satisfied: requests in ./dist-packages (2.22.0)
Requirement already satisfied: idna<2.9,>=2.5 in ./dist-packages (from requests) (2.8)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in ./dist-packages (from requests) (3.0.4)
Requirement already satisfied: certifi>=2017.4.17 in ./dist-packages (from requests) (2020.4.5.1)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in ./dist-packages (from requests) (1.25.9)

Python 2.7.16 (default, May  6 2020, 13:05:58) 
[GCC 4.8.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import requests
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named requests
>>>

pip install requests，表示已安装。但是当在交互模式下检查时，由于没有模块名称请求而出错。您能否帮助我了解这些模块正在哪些位置使用（此路径已在何处设置？）以及如何在该特定位置安装模块？

你能帮我么 ？

答案1

我假设您的 pip 版本没有安装适用于您的 python 版本的软件包。 （如 pip3 和 python 2.7）。如果您想强制 pip 使用 python3（或 python 2.7），请使用 安装模块pythonx.x -m pip install <module name>，其中 xx 是您所需的 python 版本

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