什么更快?两个列表理解还是一个和一个list.copy()

Question

以下哪个更快？

a = ['' for _ in range(len(x))]
b = ['' for _ in range(len(x))]

或

a = ['' for _ in range(len(x))]
b = a.copy()

提前感谢！

Answer 1

您可以使用定时装饰器轻松地看到：

from functools import wraps
from time import time
def timing(f):
@wraps(f)
def wrap(*args, **kw):
ts = time()
result = f(*args, **kw)
te = time()
print(f'func:{f.__name__} args:[{args}, {kw}] took: {te-ts} sec')
return result
return wrap
x = 10000000
@timing
def a(x):
a = ['' for _ in range(x)]
b = [i for i in a]
@timing
def b(x):
a = ['' for _ in range(x)]
b = a.copy()
a(x)
b(x)