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Fix zero padding for string format specs #8407

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Merged
youknowone merged 2 commits into from
Jul 29, 2026
Merged

Fix zero padding for string format specs #8407

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88f8958
Fix zero padding for string format specs
shAn-kor Jul 26, 2026
6ac3491
Add string alignment format regression test
shAn-kor Jul 27, 2026
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Add string alignment format regression test 
Assisted-by: Codex:gpt-5
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@shAn-kor
shAn-kor committed Jul 27, 2026
commit 6ac349104c082d4d19ad63e283918ececc6e0e36
8 changes: 8 additions & 0 deletions extra_tests/snippets/builtin_format.py
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Expand Up @@ -24,6 +24,14 @@ def test_zero_padding():

test_zero_padding()

try:
format("result", "=8s")
except ValueError as error:
if str(error) != "'=' alignment not allowed in string format specifier":
raise AssertionError(f"unexpected error message: {error}") from error
else:
raise AssertionError("expected ValueError for '=8s' string format specifier")

assert "{:,}".format(100) == "100"
assert "{:,}".format(1024) == "1,024"
assert "{:_}".format(65536) == "65_536"
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