如何启动ttk.Progressbar? [英] How to start ttk.Progressbar?
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问题描述
我无法启动进度栏。我搜寻了互联网上的答案,并尝试了数小时的多种方法,但由于以下错误而受到奖励:
I am having trouble with getting the progressbar to start. I have scoured the internet for answers, and have tried multiple ways for hours, but have been rewarded with errors such as:
TypeError: unbound method start() must be called with Progressbar instance as first argument (got nothing instead)
TypeError: unbound method start() must be called with Progressbar instance as first argument (got NoneType instance instead)
AttributeError: 'NoneType' object has no attribute 'stop'
(基本上)是我的代码:
Here is (essentially) my code:
from Tkinter import *
import ttk
def foo():
#make progressbar start here
do_stuff()
#make progressbar end here
root = Tk()
root.title("foo")
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
mainframe.columnconfigure(0, weight=1)
mainframe.rowconfigure(0, weight=1)
prog = ttk.Progressbar(mainframe, mode='indeterminate').grid(column=1, row=100, sticky=W)
ttk.Button(mainframe, text="Check", command=foo).grid(column=1, row=100, sticky=E)
for child in mainframe.winfo_children():
child.grid_configure(padx=5, pady=5)
root.bind('<Return>', check)
root.mainloop()
推荐答案
您的prog变量不包含进度条,因为您调用了返回无值的网格方法。确实可以解释
Your prog variable does not contain the progressbar because you call the grid method which does return None. That does explain the
AttributeError: 'NoneType' object has no attribute 'stop'
将代码更改为
prog = ttk.Progressbar(mainframe, mode='indeterminate')
prog.grid(column=1, row=100, sticky=W)
之后,您可以通过以下方式在foo中启动进度栏:
after that you can start the Progressbar in foo via
prog.start()
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