Python String index() Method
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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