Mac的终端下安装pip

首先，查看python的版本

% python -V
Python 2.7.18

% cd /tmp

然后，下载文件get-pip.py

% curl https://bootstrap.pypa.io/pip/2.7/get-pip.py -o get-pip.py% Total    % Received % Xferd  Average Speed   Time    Time     Time  CurrentDload  Upload   Total   Spent    Left  Speed
100 1863k  100 1863k    0     0  21633      0  0:01:28  0:01:28 --:--:-- 17463

安装pip

% sudo python get-pip.py
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support pip 21.0 will remove support for this functionality.
WARNING: The directory '/Users/tanhaoyun/Library/Caches/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting pip<21.0Downloading pip-20.3.4-py2.py3-none-any.whl (1.5 MB)|████████████████████████████████| 1.5 MB 19 kB/s
Installing collected packages: pip
Successfully installed pip-20.3.4

查看pip版本

% pip -V
pip 20.3.4 from /Library/Python/2.7/site-packages/pip (python 2.7)

pip安装成功。

接下来，安装requests模块

% pip install requests
Defaulting to user installation because normal site-packages is not writeable
Collecting requestsDownloading requests-2.27.1-py2.py3-none-any.whl (63 kB)|████████████████████████████████| 63 kB 228 kB/s
Collecting chardet<5,>=3.0.2; python_version < "3"Downloading chardet-4.0.0-py2.py3-none-any.whl (178 kB)|████████████████████████████████| 178 kB 19 kB/s
Collecting idna<3,>=2.5; python_version < "3"Downloading idna-2.10-py2.py3-none-any.whl (58 kB)|████████████████████████████████| 58 kB 13 kB/s
Collecting urllib3<1.27,>=1.21.1Downloading urllib3-1.26.9-py2.py3-none-any.whl (138 kB)|████████████████████████████████| 138 kB 15 kB/s
Collecting certifi>=2017.4.17Downloading certifi-2021.10.8-py2.py3-none-any.whl (149 kB)|████████████████████████████████| 149 kB 14 kB/s
Installing collected packages: chardet, idna, urllib3, certifi, requestsWARNING: The script chardetect is installed in '/Users/tanhaoyun/Library/Python/2.7/bin' which is not on PATH.Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed certifi-2021.10.8 chardet-4.0.0 idna-2.10 requests-2.27.1 urllib3-1.26.9

由于之前已经在python2中安装了pip，现在安装python3，重新安装一遍pip，命令为：

python3 -m pip install -U pip

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