Python 时间已过不准确显示

Question

我正在尝试创建一个 Tkinter GUI，它记录按钮之间按下的时间，然后将元组输出附加到列表中，但是它将时间差记录为 1625044470.590308。我不知道这个数字是什么意思，所以如果有人理解这个奇怪的错误帮助，将不胜感激。 我的代码：

import time
from tkinter import *

initial = 0
top = Tk()
command_time_list = []
master_list = []
print(command_time_list)
#start forward
def start_time_forward():
   global initial
   print("Timer Start")
   initial = time.time()
   return initial

def stop_time_forward():
   final = time.time()
   time_elapsed = final - initial
   command_time_list.append('a')
   command_time_list.append(time_elapsed)
   command_time_tuple = tuple(command_time_list)
   return command_time_tuple

command_time_tuple = stop_time_forward()
def append():
    master_list.append(command_time_tuple)
    print(master_list)

forward_start = Button(top, text ="Forward Time Start", command = start_time_forward)
forward_end = Button(top, text ="Forward Time Stop", command = stop_time_forward)
append = Button(top, text="append path pair", command=append)

Answer 1

Pythom 时间方法以浮点数形式返回时间，以自纪元以​​来的秒数表示，以 UTC 为单位。你的错误是忘记了全局，而且初始值不能为 0，如果是这样，那么你将从纪元开始获得时间 您将在第 27 行拥有

command_time_tuple = stop_time_forward() 

time_elapsed = 最终 - 0 其中 final 是 time.time() 以秒为单位返回自纪元以来的时间

command_time_tuple = stop_time_forward() # t0 时的值

import time
from tkinter import *

initial = time.time() #0
top = Tk()
command_time_list = []
master_list = []
print(command_time_list)
#start forward
def start_time_forward():
   global initial #like you used global here to be able to change global value
   print("Timer Start")
   initial = time.time()
   return initial

def stop_time_forward():
   final = time.time()
   time_elapsed = final - initial
   command_time_list.append('a')
   command_time_list.append(time_elapsed)
   ##!!!!! you must use global here too because  command_time_tuple is global variable !!!!!!!!!
   global command_time_tuple
   
   command_time_tuple = tuple(command_time_list) # value at t_new
   return command_time_tuple

command_time_tuple = stop_time_forward() # value at t0
def append():
    #now each time this function will be run it will append master_list with the new at t_new not with t0
    master_list.append(command_time_tuple)
    print(master_list)

forward_start = Button(top, text ="Forward Time Start", command = start_time_forward)
forward_end = Button(top, text ="Forward Time Stop", command = stop_time_forward)
append = Button(top, text="append path pair", command=append)
append.pack()
forward_end.pack()
forward_start.pack()

Answer 2

我相信这就是您想要实现的目标：

import time
from tkinter import *

initial = 0
master_list = []
command_time_list: tuple = tuple()
top = Tk()
top.geometry("600x300")

def start_time_forward():
    global initial
    initial = time.time()
    print("updated")

def stop_time_forward():
    global command_time_list
    time_elapsed = time.time() - initial
    command_time_list = ('a', time_elapsed)


def append():
    global command_time_list
    # Added an if statement to make sure that the user hits the stop button
    if command_time_list:
        master_list.append(command_time_list)
    print(master_list)
    command_time_list = tuple()

forward_start = Button(top, text="Forward Time Start", command=start_time_forward)
forward_end = Button(top, text="Forward Time Stop", command=stop_time_forward)
append = Button(top, text="append path pair", command=append)
forward_start.pack()
forward_end.pack()
append.pack()
top.mainloop()