Example of string replacement operation in Python-Python Tutorial-php.cn

Example of string replacement operation in Python

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Release： 2016-07-06 13:29:43

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For string replacement (interpolation), you can use string.Template, or you can use standard string concatenation.
string.Template indicates the replaced characters, using the "$" symbol, or within the string, using "${}"; use the string.substitute(dict) function when calling.
For standard string concatenation, use the "%()s" symbol. When calling, use the string%dict method.
Both can replace characters.

Code:

# -*- coding: utf-8 -*- 
 
import string 
 
values = {'var' : 'foo'} 
 
tem = string.Template(''''' 
Variable : $var 
Escape : $$ 
Variable in text : ${var}iable 
''') 
 
print 'TEMPLATE:', tem.substitute(values) 
 
str = ''''' 
Variable : %(var)s 
Escape : %% 
Variable in text : %(var)siable 
''' 
 
print 'INTERPOLATION:', str%values

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Output:

TEMPLATE:  
Variable : foo 
Escape : $ 
Variable in text : fooiable 
 
INTERPOLATION:  
Variable : foo 
Escape : % 
Variable in text : fooiable

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Regular expression (re) for continuous replacement (replace)
Continuous string replacement, you can use replace continuously, or you can use regular expressions.
Regular expression, through the dictionary style, the key is to be replaced, the value is to be replaced, and it can be replaced once.

Code

# -*- coding: utf-8 -*-

import re

my_str = "(condition1) and --condition2--"
print my_str.replace("condition1", "").replace("condition2", "text")

rep = {"condition1": "", "condition2": "text"}
rep = dict((re.escape(k), v) for k, v in rep.iteritems())
pattern = re.compile("|".join(rep.keys()))
my_str = pattern.sub(lambda m: rep[re.escape(m.group(0))], my_str)

print my_str

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Output:

() and --text--
() and --text--

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Related labels：

python string replace

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