crypt — 用于校验 Unix 口令的函数
crypt
imghdr
源代码： Lib/imghdr.py
Deprecated since version 3.11, will be removed in version 3.13: The imghdr 模块被弃用 (见 PEP 594 for details and alternatives).
The imghdr 模块确定文件或字节流中包含的图像类型。
The imghdr 模块定义以下函数：
Test the image data contained in the file named file and return a string describing the image type. If h is provided, the file argument is ignored and h is assumed to contain the byte stream to test.
3.6 版改变： 接受 像路径对象 .
The following image types are recognized, as listed below with the return value from what() :
what()
值
图像格式
'rgb'
'gif'
'pbm'
'pgm'
'ppm'
'tiff'
'rast'
'xbm'
'jpeg'
'bmp'
'png'
'webp'
'exr'
Added in version 3.5: The exr and webp 格式被添加。
You can extend the list of file types imghdr can recognize by appending to this variable:
A list of functions performing the individual tests. Each function takes two arguments: the byte-stream and an open file-like object. When what() is called with a byte-stream, the file-like object will be None .
None
The test function should return a string describing the image type if the test succeeded, or None if it failed.
范例：
>>> import imghdr >>> imghdr.what('bass.gif') 'gif'
mailcap — Mailcap 文件处理
mailcap
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