本想用安装一个 requests 库，发现安装报错了。看报错日志感觉是连接它的 pypi 库下载官网有问题，使用默认的 pip 库下载地址安装本来就很慢。
我就试了试，改了个阿里云的镜像地址，然后就好了，速度也变快了。
pip安装python库秒速下载：更改pip数据源。阿里云国外镜像。
报错信息：
C:\Users\Administrator>pip install requests WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status =None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.con nection.VerifiedHTTPSConnection object at 0x0354AE90>: Failed to establish a new connection: [WinError 10061] 由于目标计算机积极拒绝，无法连接。',)': /simple/re quests/ WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status =None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.con nection.VerifiedHTTPSConnection object at 0x03563D70>: Failed to establish a new connection: [WinError 10061] 由于目标计算机积极拒绝，无法连接。',)': /simple/re quests/ WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status =None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.con nection.VerifiedHTTPSConnection object at 0x03563F30>: Failed to establish a new connection: [WinError 10061] 由于目标计算机积极拒绝，无法连接。',)': /simple/re quests/ WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status =None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.con nection.VerifiedHTTPSConnection object at 0x03563A30>: Failed to establish a new connection: [WinError 10061] 由于目标计算机积极拒绝，无法连接。',)': /simple/re quests/ WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status =None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.con nection.VerifiedHTTPSConnection object at 0x03563950>: Failed to establish a new connection: [WinError 10061] 由于目标计算机积极拒绝，无法连接。',)': /simple/re quests/ ERROR: Could not find a version that satisfies the requirement requests (from ve rsions: none) ERROR: No matching distribution found for requests
改完镜像后的效果图：
C:\Users\Administrator>pip install requests Looking in indexes: https://mirrors.aliyun.com/pypi/simple/ Collecting requests Downloading https://mirrors.aliyun.com/pypi/packages/51/bd/23c926cd341ea6b7dd0 b2a00aba99ae0f828be89d72b2190f27c11d4b7fb/requests-2.22.0-py2.py3-none-any.whl ( 57kB) |█████████████████ | 30kB 2.0MB/s eta 0:00:0 |██████████████████████▌ | 40kB 2.7MB/s eta |████████████████████████████ | 51kB 3.4MB/s |████████████████████████████████| 61kB 4.1 MB/s Collecting certifi>=2017.4.17 Downloading https://mirrors.aliyun.com/pypi/packages/b9/63/df50cac98ea0d5b006c 55a399c3bf1db9da7b5a24de7890bc9cfd5dd9e99/certifi-2019.11.28-py2.py3-none-any.wh l (156kB) |█████████████████ | 81kB 5.5MB/s eta 0:00:0 |███████████████████ | 92kB 6.1MB/s eta 0:00 |█████████████████████ | 102kB 6.8MB/s eta 0 |███████████████████████ | 112kB 6.8MB/s eta |█████████████████████████ | 122kB 6.8MB/s e |███████████████████████████ | 133kB 6.8MB/s |█████████████████████████████▌ | 143kB 6.8M |███████████████████████████████▌| 153kB 6. |████████████████████████████████| 163kB 6. 8MB/s Collecting chardet<3.1.0,>=3.0.2 Downloading https://mirrors.aliyun.com/pypi/packages/bc/a9/01ffebfb562e4274b64 87b4bb1ddec7ca55ec7510b22e4c51f14098443b8/chardet-3.0.4-py2.py3-none-any.whl (13 3kB) |████████████████████████▌ | 102kB 6.8MB/s e |███████████████████████████ | 112kB 6.8MB/s |█████████████████████████████▌ | 122kB 6.8M |████████████████████████████████| 133kB 6. |████████████████████████████████| 143kB 6. 8MB/s Collecting idna<2.9,>=2.5 Downloading https://mirrors.aliyun.com/pypi/packages/14/2c/cd551d81dbe15200be1 cf41cd03869a46fe7226e7450af7a6545bfc474c9/idna-2.8-py2.py3-none-any.whl (58kB) |████████████████████████████████| 61kB ... Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in d:\pyt hon\lib\site-packages (from requests) (1.25.3) Installing collected packages: certifi, chardet, idna, requests Successfully installed certifi-2019.11.28 chardet-3.0.4 idna-2.8 requests-2.22.0
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