python之函數用法startswith()

# -*- coding: utf-8 -*-
#python 27
#xiaodeng
#python之函數用法startswith()
#http://www.runoob.com/python/att-string-startswith.html#startswith()
#說明：返回布爾值,用于檢查字符串是否是以指定子字符串開頭，如果是則返回 True，否則返回 False。
'''
startswith(...)S.startswith(prefix[, start[, end]]) -> boolprefix:前綴start：字符串的開始位置end：字符串結束位置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
#判斷字符串是否以指定字符串開頭
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

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