Python string find

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本文深入探讨了Python中字符串find()方法的功能、语法、参数、返回值以及使用实例，帮助开发者了解如何在字符串中搜索特定子串。

Python String find() Method

Description

It determines if string str occurs in string, or in a substring of string if starting index beg and ending index end are given.

Syntax

str.find(str, beg=0 end=len(string))

Parameters

str -- This specifies the string to be searched.
beg -- This is the starting index, by default its 0.
end -- This is the ending index, by default its equal to the lenght of the string.

Return Value

Index if found and -1 otherwise.

Example

#!/usr/bin/python

str1 = "this is string example....wow!!!";
str2 = "exam";

print str1.find(str2)
print str1.find(str2, 10)
print str1.find(str2, 40)