Clash Royale CLAN TAG#URR8PPP

Which is faster between a list comprehension and using the list()

Trying to create a list of items using one of these methods:

from pathlib import Path

list_comprehension = [item for item in Path('.').iterdir()]

list_method = list(Path('.').iterdir())


Which is faster and how do I check for speed.

timeit

2 Answers
2

you can use timeit module to achieve it.

timeit

import timeit

first = """
from pathlib import Path

list_comprehension = [item for item in Path('.').iterdir()]
"""

second = """
from pathlib import Path

list_method = list(Path('.').iterdir())
"""

print(timeit.timeit(stmt=first, number=10000))
# 1.0698672000000329
print(timeit.timeit(stmt=second, number=10000))
# 1.0508478000000423


Use the following code to check the time

from pathlib import Path
from datetime import datetime
start_time = datetime.now()
list_comprehension = [item for item in Path('.').iterdir()]
print(datetime.now()- start_time)
start_time = datetime.now()
list_method = list(Path('.').iterdir())
print(datetime.now()- start_time)


EDIT:
You should use timeit for better result

import timeit

list_comprehension = '''
from pathlib import Path
a = [item for item in Path('.').iterdir()]'''

list_method = '''
from pathlib import Path
a = list(Path('.').iterdir())'''

print(timeit.timeit(list_comprehension, number=1000))
# 0.10110808495664969
print(timeit.timeit(list_method, number=1000))
# 0.05479578400263563


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