#### Is Pangram

R
p
```"""
wiki: https://en.wikipedia.org/wiki/Pangram
"""

def is_pangram(
input_str: str = "The quick brown fox jumps over the lazy dog",
) -> bool:
"""
A Pangram String contains all the alphabets at least once.
>>> is_pangram("The quick brown fox jumps over the lazy dog")
True
>>> is_pangram("Waltz, bad nymph, for quick jigs vex.")
True
>>> is_pangram("Jived fox nymph grabs quick waltz.")
True
>>> is_pangram("My name is Unknown")
False
>>> is_pangram("The quick brown fox jumps over the la_y dog")
False
>>> is_pangram()
True
"""
# Declare frequency as a set to have unique occurrences of letters
frequency = set()

# Replace all the whitespace in our sentence
input_str = input_str.replace(" ", "")
for alpha in input_str:
if "a" <= alpha.lower() <= "z":
return len(frequency) == 26

def is_pangram_faster(
input_str: str = "The quick brown fox jumps over the lazy dog",
) -> bool:
"""
>>> is_pangram_faster("The quick brown fox jumps over the lazy dog")
True
>>> is_pangram_faster("Waltz, bad nymph, for quick jigs vex.")
True
>>> is_pangram_faster("Jived fox nymph grabs quick waltz.")
True
>>> is_pangram_faster("The quick brown fox jumps over the la_y dog")
False
>>> is_pangram_faster()
True
"""
flag = [False] * 26
for char in input_str:
if char.islower():
flag[ord(char) - 97] = True
elif char.isupper():
flag[ord(char) - 65] = True
return all(flag)

def is_pangram_fastest(
input_str: str = "The quick brown fox jumps over the lazy dog",
) -> bool:
"""
>>> is_pangram_fastest("The quick brown fox jumps over the lazy dog")
True
>>> is_pangram_fastest("Waltz, bad nymph, for quick jigs vex.")
True
>>> is_pangram_fastest("Jived fox nymph grabs quick waltz.")
True
>>> is_pangram_fastest("The quick brown fox jumps over the la_y dog")
False
>>> is_pangram_fastest()
True
"""
return len({char for char in input_str.lower() if char.isalpha()}) == 26

def benchmark() -> None:
"""
Benchmark code comparing different version.
"""
from timeit import timeit

setup = "from __main__ import is_pangram, is_pangram_faster, is_pangram_fastest"
print(timeit("is_pangram()", setup=setup))
print(timeit("is_pangram_faster()", setup=setup))
print(timeit("is_pangram_fastest()", setup=setup))
# 5.348480500048026, 2.6477354579837993, 1.8470395830227062
# 5.036091582966037, 2.644472333951853,  1.8869528750656173

if __name__ == "__main__":
import doctest

doctest.testmod()
benchmark()
```