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Use a slice to keep the first 10 characters of a Python string: text[:10]. It returns at most 10 characters and safely returns the whole string if it is shorter than 10.
Keep the first 10 characters
text = "Python makes string handling easy"
trimmed = text[:10]
print(trimmed)
# Python makIn text[:10], the start is omitted, so the slice begins at the start of the string. The stop position, 10, is excluded: the slice includes positions 0 through 9. A stop position beyond the string’s length is allowed, so a short input needs no special case.
text = "Python"
print(text[:10])
# PythonThis is a maximum, not a fixed length. A six-character input remains six characters; Python does not pad it. To check the result, use len(trimmed) or assert len(trimmed) <= 10. Python’s slice and string behavior is documented in the Python tutorial and standard types reference.
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Slicing returns a new string; it does not change the original, because Python strings are immutable. Assign the result if you want to use the shorter value:
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text = text[:10]Truncation is not whitespace stripping
“Trim” can mean either shortening a string or removing whitespace around it. Use slicing to truncate; use strip() to remove whitespace from both ends:
text = " Python programming "
text.strip()
# 'Python programming'
text.strip()[:10]
# 'Python pro'Order matters. text.strip()[:10] removes leading and trailing whitespace first, then keeps the first 10 characters. text[:10].strip() takes the first 10 characters first, then strips whitespace from that fragment. They can produce different results.
For only leading whitespace, use lstrip(); for only trailing whitespace, use rstrip(). Neither method limits the string’s length by itself.
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Add an ellipsis without exceeding 10 characters
Appending an ellipsis after taking 10 characters makes a result up to 13 characters long:
text[:10] + "..."If the total result must be no longer than 10 characters, reserve three positions for the ellipsis. Keep shorter strings unchanged:
def trim_with_ellipsis(text: str, limit: int = 10) -> str:
if limit < 0:
raise ValueError("limit must be non-negative")
if len(text) <= limit:
return text
if limit <= 3:
return "." * limit
return text[:limit - 3] + "..."
print(trim_with_ellipsis("Python makes string handling easy"))
# Python ...The output is at most 10 characters. When the input is already 10 characters or shorter, it is returned unchanged, so it may be shorter than 10. For a fixed limit of 10, the core expression for a longer input is text[:7] + "...".
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Keep the last 10 characters instead
Use a negative start index to take the tail of a string:
text = "ABCDEFGHIJKLM"
print(text[-10:])
# DEFGHIJKLMAs with a positive slice, a short string is returned whole. This is useful when the ending—such as an identifier suffix or filename extension—is what matters.
Use a variable limit
Replace the literal 10 with a variable when the limit depends on the context:
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limit = 10
trimmed = text[:limit]A small helper makes the rule reusable. If a negative limit should be treated as invalid rather than as Python’s valid negative-slice syntax, check it explicitly:
def truncate(text: str, limit: int) -> str:
if limit < 0:
raise ValueError("limit must be non-negative")
return text[:limit]Format a field to width 10
For ordinary truncation, text[:10] is the clearest choice. If you are formatting aligned output, string precision and field width can be combined:
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print(repr(f"{text:<10.10}"))
# 'Python 'Here, <10 sets a minimum field width of 10 and left-aligns the value; .10 caps the string precision at 10. A shorter value is padded with spaces, while a longer one is capped. To cap length without padding, f"{text:.10}" applies the precision alone. See the Python format specification. Width and padding are formatting concerns, not a replacement for the basic slice in ordinary string processing.
What counts as a character?
For a Python str, slicing and len() operate on Unicode code points, not encoded bytes or necessarily the visible symbols a person perceives as characters. Most plain text behaves as expected, but an emoji sequence, flag, or letter combined with a separate accent can contain multiple code points. A slice can split such a sequence—for example, taking only the first code point of "eu0301clair" can leave the base letter without its combining accent.
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If a limit means 10 user-perceived characters, use a grapheme-aware approach rather than assuming that 10 code points are 10 complete visible symbols. If it means 10 bytes, such as a UTF-8 storage limit, ordinary string slicing is not enough. Encode first and truncate the bytes carefully so the result does not end in the middle of a UTF-8 sequence:
def truncate_utf8_to_bytes(text: str, limit: int = 10) -> str:
if limit < 0:
raise ValueError("limit must be non-negative")
encoded = text.encode("utf-8")
if len(encoded) <= limit:
return text
end = limit
while end > 0:
try:
return encoded[:end].decode("utf-8")
except UnicodeDecodeError:
end -= 1
return ""This keeps the encoded result within the byte limit and avoids returning a partial code point. It does not guarantee a whole grapheme cluster: a combining mark or multi-code-point emoji sequence could still be cut at a valid code-point boundary. Python’s Unicode HOWTO explains the distinction between Unicode strings and encoded byte sequences. For APIs, files, databases, or display fields, check what the receiving system actually limits: code points, grapheme clusters, bytes, or visual columns.
Quick Recap
Common mistakes and quick reference
text[10]gets the single character at index 10 (the eleventh character), not the first 10. It raisesIndexErrorif that position does not exist. Usetext[:10]for a safe prefix slice.text[:10] + "..."can exceed a 10-character total. Reserve room for the suffix first.text.strip()removes surrounding whitespace; it does not truncate the string or remove internal whitespace.text.ljust(10)pads short strings but does not truncate a longer one on its own. See the Python tutorial’s string-formatting section.- Slicing an integer is not string truncation. Convert only if its string representation is the value you intend to use:
str(value)[:10]. Decide explicitly how to handleNoneor other non-string inputs.
| Need | Expression |
|---|---|
| First 10 characters | text[:10] |
| Last 10 characters | text[-10:] |
| Strip both ends, then take the first 10 | text.strip()[:10] |
At most 10 including ... |
text[:7] + "..." when the input exceeds 10 |
| Variable maximum | text[:limit] |
| Minimum width 10, capped at 10 | f"{text:<10.10}" |
| 10 UTF-8 bytes | Encode, truncate on a valid UTF-8 boundary, then decode |
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