time.perf_counter()返回性能计数器的值（以秒的小数部分为单位),我的输出不符标准
import threading# 线程模块import time
def eat_breakfast():
time.sleep(3)
print("You eat breakfast")
def drink_coffee():
time.sleep(4)
print("You drank coffee")
def study():
time.sleep(5)
print("You finish studying")
x = threading.Thread(target=eat_breakfast, args=())
x.start()
y = threading.Thread(target=drink_coffee, args=())
y.start()
z = threading.Thread(target=study, args=())
z.start()
x.join() # thread synchronization(线程同步)
y.join() # thread synchronize and join(线程同步并加入)
z.join()
# eat_breakfast()
# drink_coffee()
# study()
print(threading.active_count())# 函数名活动计数
print(threading.enumerate())# 函数名枚举
print(time.perf_counter())# performance counter function(函数名性能计数器)
console window:
You eat breakfast
You drank coffee
You finish studying
1
[<_MainThread(MainThread, started 14744)>]
9517.6617491 视频教程输出只有5.1390643s，我的输出是9517.6617491s，这没道理呀{:10_245:}
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