python之函数用法startswith()

# -*- coding: utf-8 -*-
#python 27
#xiaodeng
#python之函数用法startswith()
#http://www.runoob.com/python/att-string-startswith.html

#startswith()
#说明：返回布尔值,用于检查字符串是否是以指定子字符串开头，如果是则返回 True，否则返回 False。
'''
startswith(...)
    S.startswith(prefix[, start[, end]]) -> bool
    prefix:前缀
    start：字符串的开始位置
    end：字符串结束位置

    Return True if S starts with the specified prefix, False otherwise.
    With optional start, test S beginning at that position.
    With optional end, stop comparing S at that position.
    prefix can also be a tuple of strings to try.
'''

#案例
#判断字符串是否以指定字符串开头
str='xiaodeng love python'
prefix='xiaodeng'
print str.startswith(prefix)#True
prefix='deng'
print str.startswith(prefix,4)#True
prefix='love'
print str.startswith(prefix,4,13)#True