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Python String index() Method

❮ String Methods

Example

Where in the text is the word "welcome"?:

txt = "Hello, welcome to my world."

x = txt.index("welcome")

print(x)
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Definition and Usage

The index() method finds the first occurrence of the specified value.

The index() method raises an exception if the value is not found.

The index() method is almost the same as the find() method, the only difference is that the find() method returns -1 if the value is not found. (See example below)

Syntax

string.index(value, start, end)

Parameter Values

Parameter Description
value Required. The value to search for
start Optional. Where to start the search. Default is 0
end Optional. Where to end the search. Default is to the end of the string

More Examples

Example

Where in the text is the first occurrence of the letter "e"?:

txt = "Hello, welcome to my world."

x = txt.index("e")

print(x)
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Example

Where in the text is the first occurrence of the letter "e" when you only search between position 5 and 10?:

txt = "Hello, welcome to my world."

x = txt.index("e", 5, 10)

print(x)
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Example

If the value is not found, the find() method returns -1, but the index() method will raise an exception:

txt = "Hello, welcome to my world."

print(txt.find("q"))
print(txt.index("q"))
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❮ String Methods