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在用python做一个GUI界面时，想搞一个进度条实时显示下载进度，但查阅很多博客，最后的显示效果都类似下面这种：
这种效果在CMD界面看着还可以，但放到图形界面时就有点丑了，所以我用Canvas重新做了一个进度条，完美满足了我的要求，看着也比较舒服。
import time
import threading
from tkinter import *
def update_progress_bar():
for percent in range(1, 101):
hour = percent / 3600
minute = percent / 60
second = percent % 60
green_length = int(sum_length * percent / 100)
canvas_progress_bar.coords(canvas_shape, (0, 0, green_length, 25))
canvas_progress_bar.itemconfig(canvas_text, text='%02d:%02d:%02d' % (hour, minute, second))
var_progress_bar_percent.set('%0.2f %%' % percent)
time.sleep(1)
def run():
th = threading.Thread(target=update_progress_bar)
th.setDaemon(True)
th.start()
top = Tk()
top.title('Progress Bar')
top.geometry('800x500+290+100')
top.resizable(False, False)
top.config(bg='#535353')
# 进度条
sum_length = 630
canvas_progress_bar = Canvas(top, width=sum_length, height=20)
canvas_shape = canvas_progress_bar.create_rectangle(0, 0, 0, 25, fill='green')
canvas_text = canvas_progress_bar.create_text(292, 4, anchor=NW)
canvas_progress_bar.itemconfig(canvas_text, text='00:00:00')
var_progress_bar_percent = StringVar()
var_progress_bar_percent.set('00.00 %')
label_progress_bar_percent = Label(top, textvariable=var_progress_bar_percent, fg='#F5F5F5', bg='#535353')
canvas_progress_bar.place(relx=0.45, rely=0.4, anchor=CENTER)
label_progress_bar_percent.place(relx=0.89, rely=0.4, anchor=CENTER)
# 按钮
button_start = Button(top, text='开始', fg='#F5F5F5', bg='#7A7A7A', command=run, height=1, width=15, relief=GROOVE, bd=2, activebackground='#F5F5F5', activeforeground='#535353')
button_start.place(relx=0.45, rely=0.5, anchor=CENTER)
top.mainloop()
显示效果如下：
