python临时关闭warning警告

在python里，如果想产生一个警告，比如要建议调用者尽量不用某个老版本模块，写法如下：

import warnings

warnings.warn('deprecated', DeprecationWarning)

有时候我们就是需要调用三方的某个老版本模块或者函数，但是又不想看到警告，此时就需要临时性关闭警告：

import warnings

with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    #call some deprecated functions

这个在禁止做ssl安全性检查时非常有用：

import requests

with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    r = requests.get(url, verify=False)

否则就会出现安全性警告：

InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings