Python中的文本替换

文本替换是字符串的基本操作，Python的str提供了replace方法：

class="lazy" data-src = '那个人看起来好像一条狗，哈哈'
print(class="lazy" data-src.replace('，哈哈', '.'))

上面代码最后的输出结果是：

那个人看起来好像一条狗.

对于习惯了Java中的replace，Python的replace用起来有些不适应，因为后者不支持直接使用正则表达式。要实现通过正则表达式的替换，可以配合Python的正则表达式模块使用。比如：

"""
替换掉字符串value内竖线之后的的内容
"""
import re

class="lazy" data-src = '[{"name":"date","value":"2017数据"},{"name":"年收入","value":"3000|{"url":"http://www.abc.com/chart/income","x":"0","y":"456.172820"}"},{"name":"税款","value":"-"},{"name":"人数","value":"3419"},{"name":"部门","value":"27|{"url":"http://www.abc.com/department/list","x":"0","y":"155.852820"}"},{"name":"部门营收","value":"-"}]'

#通过则表达式查找，如果有多个匹配，只能获取到最后一个
matches = re.search('\|{.*?"}', class="lazy" data-src)
while matches is not None:
    class="lazy" data-src = class="lazy" data-src.replace(matches.group(0), '')
    matches = re.search('\|{.*?"}', class="lazy" data-src)

print(class="lazy" data-src)

最后的结果：

[{"name":"date","value":"2017数据"},{"name":"年收入","value":"3000"},{"name":"税款","value":"-"},{"name":"人数","value":"3419"},{"name":"部门","value":"27"},{"name":"部门营收","value":"-"}]