哪个计数器更快 Python

Question

我想知道哪个计数器更快

1)

from threading import Thread
def c(output, i):
    if i in output:
        output[i] += 1
    else:
        output[i] = 1
def build(itera):
    output = {}
    for i in itera:
        Thread(target=c, args=(output, i)).start()
    return output

def build(itera):
    output = {}
    for i in itera:
        if i in output:
            output[i] += 1
        else:
            output[i] = 1
    return output

from collections import Counter
Counter("12342")

如果任何代码执行相同但速度更快所有三个代码块请告诉我

Answer 1

将此添加到您的代码中，看看哪个运行得更快：

from datetime import datetime

start = datetime.now()

#code here

end = datetime.now()

total = end - start

print(total.total_seconds())

Answer 2

用这个来找出哪些方法花费的时间最少：

import time

start = time.time()

***
 The code you want to test out
***

end = time.time()

time_taken = round(end - start), 2
print(time_taken)

输出以秒为单位。

使用timeit:

import timeit

def do_something():
  pass

timeit.timeit(f"{do_something()}")

哪个计数器更快 Python

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