Question

tkinter模块的button控件不点击也运行command

想做个GUI爬虫，有个按钮，输入框。刚运行输入框无网页链接，按钮没按，就读取Entry控件，用在requsts的get中，报错。错误信息：Traceback (most recent call last): File "C:/Users/Lenovo/Desktop/a.py", line 17, in <module> button=Button(root,text="下载",font="微软雅黑",command=downlaod_song()) File "C:/Users/Lenovo/Desktop/a.py", line 6, in downlaod_song res=resq.get(ur) File "E:\python3.7.5\lib\site-packages\requests\api.py", line 75, in get return request('get', url, params=params, **kwargs) File "E:\python3.7.5\lib\site-packages\requests\api.py", line 60, in request return session.request(method=method, url=url, **kwargs) File "E:\python3.7.5\lib\site-packages\requests\sessions.py", line 510, in request prep = self.prepare_request(req) File "E:\python3.7.5\lib\site-packages\requests\sessions.py", line 453, in prepare_request hooks=merge_hooks(request.hooks, self.hooks), File "E:\python3.7.5\lib\site-packages\requests\models.py", line 313, in prepare self.prepare_url(url, params) File "E:\python3.7.5\lib\site-packages\requests\models.py", line 387, in prepare_url raise MissingSchema(error)requests.exceptions.MissingSchema: Invalid URL '': No schema supplied. Perhaps you meant http://?
源码可能看不清：
from tkinter import *
import requests as resq
abc=0
def downlaod_song():
ur=entry.get()
res=resq.get(ur)
root=Tk()
root.title('网易云音乐爬虫')
root.geometry("430x250+400+200")
label = Label(root,text="输入要爬取的URL:",font=('宋体',15))
label.grid()
entry=Entry(root,font=("微软雅黑",15))
entry.grid(row=0,column=1)
li=Listbox(root,font=('微软雅黑',10))
li.grid(row=1,column=0)
button=Button(root,text="下载",font="微软雅黑",command=downlaod_song())
button.grid(row=1,column=1)
root.mainloop()

Answer 1

from tkinter import *
root=Tk()
class count():
def __init__(self):
self.times=0
def __call__(self):
self.times+=1
def gettimes(self):
return self.times
aclick=count()
t=StringVar()
text=Entry(root,textvariable=t)
text.pack()
Button(root,command=aclick,text="buttona").pack()
Button(root,text="get buttona clicktimes",command=lambda:t.set("buttona click %d times"%aclick.gettimes())).pack()
root.mainloop()

追问

本人新手，都是按教程写的爬虫，能写一下注释喵？😁

Answer 2

我碰到过，因为对着书打没有出现过问题，那么肯定是自己的设置造成的。实际上command后面接的函数是不带( )这个的，你删去就好。不知道你解决了没有。

Answer 3

downlaod_song里面设置标志位控制就行