How python detects whether a string contains a string

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Index () syntax

Str.index (str, beg=0, end=len (string))

Parameter description:

Str: specifies the string to retrieve

Beg: start indexing. Default is 0.

End: ends the index, which defaults to the length of the string.

Examples of use:

#! / usr/bin/python

Str1 = "this is string example.wowning examples!"

Str2 = "exam"

Print str1.index (str2)

Print str1.index (str2, 10)

Print str1.index (str2, 40)

Return the result:

fifteen

fifteen

Traceback (most recent call last):

File "test.py", line 8, in

Print str1.index (str2, 40)

ValueError: substring not found

Shell returned 1

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