Python字符串替换，替换开头字符串，替换结尾字符串
import re
srcs = "hello 123, world, 456"
print(srcs)
pat = r'\d+'
dests = re.compile(pat).sub('888', srcs) //第一个参数根据正则表达式替换原始字符串
print(dests)
eliminate = re.compile('\d+')
text = eliminate.sub("888", "hello 123, world, 456")
print(text)
输出
hello 123, world, 456
hello 888, world, 888
hello 888, world, 888
替换结尾字符串：
servicename = re.sub('Interface' + '$', '', 'Interface_InterfaceserviceInterfaceInterface_Interface')
print(servicename)
//'$' 表示结尾，所以会替换结尾处的字符串
输出：
Interface_InterfaceserviceInterfaceInterface_
替换开头的字符串：
servicename = re.sub('^'+'Interface', '', 'Interface_InterfaceserviceInterfaceInterface_Interface')
print(servicename)
//'^' 表示开头，所以会替换开头处的字符串或
servicename = 'Interface_InterfaceserviceInterfaceInterface_Interface'.replace('Interface', '', 1)
print(servicename)// 后面这个1表示替换次数，1次就替换最开始匹配的字符串
输出：
_InterfaceserviceInterfaceInterface_Interface
_InterfaceserviceInterfaceInterface_Interface
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