import requests
url=input().strip(' \t\n\r')
html = requests.get(url)

print(html.text)

import requests
url=input().strip(' \t\n\r')
html = requests.get(url)
html.encoding=('utf-8')
print(html.text)

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProxyError('Cannot connect to proxy.', OSError(0, 'Error'))': /pypi/simple/eyed3/ 

pip install requests -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

国内的pip源，如下：

阿里云 http://mirrors.aliyun.com/pypi/simple/

中国科技大学 https://pypi.mirrors.ustc.edu.cn/simple/

豆瓣(douban) http://pypi.douban.com/simple/

清华大学 https://pypi.tuna.tsinghua.edu.cn/simple/

中国科学技术大学 http://pypi.mirrors.ustc.edu.cn/simple/

>>>pip install pyqt5 #报错内容如下
ERROR: spyder 4.0.1 requires pyqtwebengine<5.13; python_version >= "3", which is not installed. 
ERROR: spyder 4.0.1 has requirement pyqt5<5.13; python_version >= "3", but you'll have pyqt5 5.15.6 which is incompatible.

>>>pip install spyder==*
ERROR: Could not find a version that satisfies the requirement spyder==* (from versions: 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5.2, 2.3.6, 2.3.7, 2.3.8, 2.3.9, 3.0.0b2, 3.0.0b3, 3.0.0b4, 3.0.0b5, 3.0.0b6, 3.0.0b7, 3.0.0, 3.0.1, 3.0.2, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.6, 3.2.7, 3.2.8, 3.3.0, 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.3.5, 3.3.6, 4.0.0b1, 4.0.0b2, 4.0.0b3, 4.0.0b4, 4.0.0b5, 4.0.0b6, 4.0.0b7, 4.0.0rc1, 4.0.0rc2, 4.0.0rc3, 4.0.0, 4.0.1, 4.1.0, 4.1.1, 4.1.2, 4.1.3, 4.1.4, 4.1.5, 4.1.6, 4.2.0, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5, 5.0.0a1, 5.0.0a2, 5.0.0a3, 5.0.0a4, 5.0.0a5, 5.0.0a6, 5.0.0a7, 5.0.0, 5.0.1, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.1.0, 5.1.1, 5.1.2, 5.1.3, 5.1.4, 5.1.5, 5.2.0, 5.2.1, 5.2.2, 5.3.0)
ERROR: No matching distribution found for spyder==*

>>>pip install spyder==5.3.0