字符串处理笔记-查找指定字符在字符串中的位置

Python

index 和 find

str = "Position of a character"
str.index('s')

The difference is that find returns -1 when what you're looking for isn't found. index throws an exception.
Function str.find(sub[, start[, end]]) Return the lowest index in the string where substring sub is found, such that sub is contained in the range [start,
  end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if sub is not found.
And:
Function str.index(sub[, start[, end]]) Like  find(), but raise ValueError when the substring is not found.
例：

Windows 7

>>> s="中国路13号弄"
>>> s.find("号")
8

MAC OSX10.9.2

>>> s="中国路13号弄"
>>> s.find("号")
11

http://stackoverflow.com/questions/2294493/how-to-get-the-position-of-a-character-in-python