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Optimization for pangram string (#2473)

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* optimization for pangram string

* fixup! Format Python code with psf/black push

* Update strings/check_pangram.py

Co-authored-by: Christian Clauss <cclauss@me.com>

* updating DIRECTORY.md

* Update strings/check_pangram.py

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>
This commit is contained in:
Du Yuanchao 2020-09-26 22:58:59 +08:00 committed by GitHub
parent 7446e69571
commit 8904af98a1
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1 changed files with 47 additions and 5 deletions
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52
strings/check_pangram.py
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@ -1,4 +1,6 @@
# Created by sarathkaul on 12/11/19
"""
wiki: https://en.wikipedia.org/wiki/Pangram
"""
def check_pangram(
@ -8,10 +10,16 @@ def check_pangram(
A Pangram String contains all the alphabets at least once.
>>> check_pangram("The quick brown fox jumps over the lazy dog")
True
>>> check_pangram("Waltz, bad nymph, for quick jigs vex.")
True
>>> check_pangram("Jived fox nymph grabs quick waltz.")
True
>>> check_pangram("My name is Unknown")
False
>>> check_pangram("The quick brown fox jumps over the la_y dog")
False
>>> check_pangram()
True
"""
frequency = set()
input_str = input_str.replace(
@ -24,7 +32,41 @@ def check_pangram(
return True if len(frequency) == 26 else False
if __name__ == "main":
check_str = "INPUT STRING"
status = check_pangram(check_str)
print(f"{check_str} is {'not ' if status else ''}a pangram string")
def check_pangram_faster(
input_str: str = "The quick brown fox jumps over the lazy dog",
) -> bool:
"""
>>> check_pangram_faster("The quick brown fox jumps over the lazy dog")
True
>>> check_pangram("Waltz, bad nymph, for quick jigs vex.")
True
>>> check_pangram("Jived fox nymph grabs quick waltz.")
True
>>> check_pangram_faster("The quick brown fox jumps over the la_y dog")
False
>>> check_pangram_faster()
True
"""
flag = [False] * 26
for char in input_str:
if char.islower():
flag[ord(char) - ord("a")] = True
return all(flag)
def benchmark() -> None:
"""
Benchmark code comparing different version.
"""
from timeit import timeit
setup = "from __main__ import check_pangram, check_pangram_faster"
print(timeit("check_pangram()", setup=setup))
print(timeit("check_pangram_faster()", setup=setup))
if __name__ == "__main__":
import doctest
doctest.testmod()
benchmark()