Python cookbook Study Notes [Replace multiple strings at a time]

Import re
Def multiple_replace (text, adict ):
Rx = re. compile ('|'. join (map (re. escape, adict )))
Def one_xlat (match ):
Return adict [match. group (0)]
Return rx. sub (one_xlat, text)

Print multiple_replace ('abc123erts', {'A': 'A', 'B': 'B '})

The basic principle is that we use the string to be replaced as the key of a dictionary, and the corresponding string to be replaced as its value.

Connect each key with the | sign, use the compile method of the re module to generate a regular expression, and then call the sub (note that the sub of the rx is called instead of the re module) method to replace the regular expression, here we pass in a callback function one_xlat for the sub method,

This function is called every time a replacement string is matched, and the corresponding value in the dictionary is returned to complete replacement of multiple strings at a time!