python string index

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The function .index() returns the index (position) of a substring in a string (if found). Returns exception if not found.
It’s case sensitive. If you want to know at which character a substring inside a string starts, you need this function.

Syntax

The format is:


str.index(string)

or you can use this format


str.index(string,start,end)

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Parameters

Example

Parameter
string The string to search.
start Index to start searching (optional).
end Ending index (optional).


str = "Tip of the day: "
print( str.index("Tip") )

Result:

Example #2


str = "Tip of the day: "
print( str.index("Tip",5) ) # throws exception

Result:


Traceback (most recent call last):
  File “tmp.py”, line 2, in
    print( str.index(“Tip”) )
ValueError: substring not found

Posted in Documentation

2015-06-28

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