在cmd窗口输入pip install requests 即可，如下
C:Usershorn1Desktoppython4>pip install requests
Collecting requests
Downloading requests-2.18.4-py2.py3-none-any.whl (88kB)
100% |████████████████████████████████| 92kB 253kB/s
Collecting certifi>=2017.4.17 (from requests)
Downloading certifi-2018.1.18-py2.py3-none-any.whl (151kB)
100% |████████████████████████████████| 153kB 724kB/s
Collecting chardet<3.1.0,>=3.0.2 (from requests)
Downloading chardet-3.0.4-py2.py3-none-any.whl (133kB)
100% |████████████████████████████████| 143kB 1.1MB/s
Collecting idna<2.7,>=2.5 (from requests)
Downloading idna-2.6-py2.py3-none-any.whl (56kB)
100% |████████████████████████████████| 61kB 1.3MB/s
Collecting urllib3<1.23,>=1.21.1 (from requests)
Downloading urllib3-1.22-py2.py3-none-any.whl (132kB)
100% |████████████████████████████████| 133kB 1.3MB/s
Installing collected packages: certifi, chardet, idna, urllib3, requests
Successfully installed certifi-2018.1.18 chardet-3.0.4 idna-2.6 requests-2.18.4 urllib3-1.22
You are using pip version 9.0.1, however version 9.0.3 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.