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Regex solution in Clear category for Sort by Extension by sur191
import re
def sort_by_ext(files: list[str]) -> list[str]:
prog = re.compile(r"(\w*)(\.\w*)$")
def ext_key(file):
match = prog.search(file)
# first files without extension, then sort by extension, then sort by name
return (bool(match.group(1)), match.group(2), match.group(1))
return sorted(files, key=ext_key)
print("Example:")
print(sort_by_ext(["1.cad", "1.bat", "1.aa"]))
# These "asserts" are used for self-checking
assert sort_by_ext(["1.cad", "1.bat", "1.aa"]) == ["1.aa", "1.bat", "1.cad"]
assert sort_by_ext(["1.cad", "1.bat", "1.aa", "2.bat"]) == [
"1.aa",
"1.bat",
"2.bat",
"1.cad",
]
assert sort_by_ext(["1.cad", "1.bat", "1.aa", ".bat"]) == [
".bat",
"1.aa",
"1.bat",
"1.cad",
]
assert sort_by_ext(["1.cad", "1.bat", ".aa", ".bat"]) == [
".aa",
".bat",
"1.bat",
"1.cad",
]
assert sort_by_ext(["1.cad", "1.", "1.aa"]) == ["1.", "1.aa", "1.cad"]
assert sort_by_ext(["1.cad", "1.bat", "1.aa", "1.aa.doc"]) == [
"1.aa",
"1.bat",
"1.cad",
"1.aa.doc",
]
assert sort_by_ext(["1.cad", "1.bat", "1.aa", ".aa.doc"]) == [
"1.aa",
"1.bat",
"1.cad",
".aa.doc",
]
print("The mission is done! Click 'Check Solution' to earn rewards!")
May 16, 2025
