pip3安装requests库

一开始保存，后面重新安装pip3.

# mahaiqiang @ MacBook-Pro in ~ [10:18:22] C:1
$ pip3 install requests
Traceback (most recent call last):
  File "/usr/local/bin/pip3", line 33, in <module>
    sys.exit(load_entry_point('pip==20.3.1', 'console_scripts', 'pip3')())
  File "/usr/local/bin/pip3", line 22, in importlib_load_entry_point
    for entry_point in distribution(dist_name).entry_points
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/metadata.py", line 524, in distribution
    return Distribution.from_name(distribution_name)
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/metadata.py", line 187, in from_name
    raise PackageNotFoundError(name)
importlib.metadata.PackageNotFoundError: pip

# mahaiqiang @ MacBook-Pro in ~ [10:18:28] C:1
$ pip3 --version
Traceback (most recent call last):
  File "/usr/local/bin/pip3", line 33, in <module>
    sys.exit(load_entry_point('pip==20.3.1', 'console_scripts', 'pip3')())
  File "/usr/local/bin/pip3", line 22, in importlib_load_entry_point
    for entry_point in distribution(dist_name).entry_points
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/metadata.py", line 524, in distribution
    return Distribution.from_name(distribution_name)
  File "/usr/local/Cellar/python@3.9/3.9.6/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/metadata.py", line 187, in from_name
    raise PackageNotFoundError(name)
importlib.metadata.PackageNotFoundError: pip

# mahaiqiang @ MacBook-Pro in ~ [10:20:21] C:1
$ curl https://bootstrap.pypa.io/get-pip.py | python3

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1892k  100 1892k    0     0   795k      0  0:00:02  0:00:02 --:--:--  795k
Collecting pip
  Downloading pip-21.2.1-py3-none-any.whl (1.6 MB)
     |████████████████████████████████| 1.6 MB 277 kB/s
Collecting setuptools
  Downloading setuptools-57.4.0-py3-none-any.whl (819 kB)
     |████████████████████████████████| 819 kB 3.7 MB/s
Collecting wheel
  Downloading wheel-0.36.2-py2.py3-none-any.whl (35 kB)
Installing collected packages: wheel, setuptools, pip
  WARNING: The script wheel is installed in '/usr/local/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/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.
  WARNING: The scripts pip, pip3 and pip3.9 are installed in '/usr/local/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/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 pip-21.2.1 setuptools-57.4.0 wheel-0.36.2

# mahaiqiang @ MacBook-Pro in ~ [10:20:50]
$ pip3 --version
pip 20.3.1 from /usr/local/lib/python3.9/site-packages/pip (python 3.9)

# mahaiqiang @ MacBook-Pro in ~ [10:21:02]
$ pip3 install requests
Collecting requests
  Downloading requests-2.26.0-py2.py3-none-any.whl (62 kB)
     |████████████████████████████████| 62 kB 240 kB/s
Collecting certifi>=2017.4.17
  Downloading certifi-2021.5.30-py2.py3-none-any.whl (145 kB)
     |████████████████████████████████| 145 kB 540 kB/s
Collecting charset-normalizer~=2.0.0
  Downloading charset_normalizer-2.0.3-py3-none-any.whl (35 kB)
Collecting idna<4,>=2.5
  Downloading idna-3.2-py3-none-any.whl (59 kB)
     |████████████████████████████████| 59 kB 1.8 MB/s
Collecting urllib3<1.27,>=1.21.1
  Downloading urllib3-1.26.6-py2.py3-none-any.whl (138 kB)
     |████████████████████████████████| 138 kB 1.4 MB/s
Installing collected packages: urllib3, idna, charset-normalizer, certifi, requests
  WARNING: The script normalizer is installed in '/usr/local/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/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-2021.5.30 charset-normalizer-2.0.3 idna-3.2 requests-2.26.0 urllib3-1.26.6

# mahaiqiang @ MacBook-Pro in ~ [10:21:17]
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