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For a non-empty Python string s, use s[0]. Python sequences start at index 0, and this returns a one-character str:
s = "Python"
first = s[0] # "P"If the string might be empty and you want an empty string rather than an error, use s[:1].
Get the first character with indexing
Python strings are zero-indexed, so the first element is at position 0. For any non-empty string, s[0] returns a string of length one. The Python built-in types reference explains that Python has no separate character type: indexing a string produces a string of length one.
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word = "Python"
first = word[0]
print(first) # PHandle an empty string
Indexing requires an element at the requested position. If s is "", then s[0] raises IndexError.
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| Expression | For a non-empty string | For an empty string | Use when |
|---|---|---|---|
s[0] |
Returns the first character as a one-character str. |
Raises IndexError. |
An empty input is invalid or should be handled explicitly. |
s[:1] |
Returns a one-character str. |
Returns "". |
An empty result is acceptable when the input is empty. |
For example, use a slice when an empty result is a valid outcome:
first_or_empty = s[:1]If an empty string signals invalid input, check for it and raise or handle an application-specific error instead of silently returning "". Python’s tutorial covers zero-based indexing and slice defaults.
Understand what Python means by a character
A Python str is an immutable sequence of Unicode code points. Therefore, s[0] returns one code point, not necessarily one complete symbol as a person sees it on screen. Some displayed symbols consist of multiple code points. If an interface must split text into user-perceived characters, use grapheme-aware Unicode processing rather than assuming each s[i] is a whole visual character.
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If the value is bytes rather than str, indexing it does not return a text character. Decode the bytes with the correct encoding first, then index the resulting string:
text = data.decode("utf-8")
first = text[0]Do not use str(data) as a substitute for decoding: without encoding arguments, it produces an informal representation of the bytes object, not decoded text.
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