使用按钮

Question

因此，每次用户点击按钮时，我都会尝试将7天添加到日期中。 这是我的代码的简化版本：

import sys
if sys.version_info[0] == 2:  # Just checking your Python version to import Tkinter properly.
    import Tkinter as tk
    import ttk as ttk
else:
    import tkinter as tk
    from tkinter.ttk import ttk as ttk
import datetime
import calendar

def nextweek(cd, ow):
    newdate=(cd+ow)
    cd=newdate
    return cd
def printdate(cd):
    print cd

curdate = datetime.date(2016, 01, 04)
one_week = datetime.timedelta(weeks = 1)

root = tk.Tk()
bls = ttk.Style()
bls.configure('Black.TLabelframe', background="#222222")

dayframe = ttk.Button(root, text="Hello", command=lambda: nextweek(curdate, one_week))
dayframe.grid(row=1, column=1, padx=5)
dayframetest = ttk.Button(root, text="test", command=lambda: printdate(curdate))
dayframetest.grid(row=2, column=1, padx=5)
root.mainloop()

到目前为止我看到的所有例子都使用全局变量，有没有办法在不使curdate成为全局变量的情况下做到这一点？

Answer 1

通常最好使用面向对象的方法来创建tkinter应用程序。我已经对你的例子进行了修改，以便将curdate存储在App类中。

N.B。我在python3上测试过它。

import sys
if sys.version_info[0] == 2:  # Just checking your Python version to import Tkinter properly.
    import Tkinter as tk
    import ttk as ttk
else:
    import tkinter as tk
    import tkinter.ttk as ttk
import datetime
import calendar

class App(tk.Frame):
    def __init__(self,master=None,**kw):
        tk.Frame.__init__(self,master=master,**kw)
        bls = ttk.Style()
        bls.configure('Black.TLabelframe', background="#222222")

        self.dayframe = ttk.Button(self, text="Hello", command= self.nextweek)
        self.dayframe.grid(row=1, column=1, padx=5)
        self.dayframetest = ttk.Button(self, text="test", command= self.printdate)
        self.dayframetest.grid(row=2, column=1, padx=5)

        self.curdate = datetime.date(2016, 1, 4)
        self.one_week = datetime.timedelta(weeks = 1)

    def nextweek(self):
        self.curdate = (self.curdate + self.one_week)

    def printdate(self):
        print(self.curdate)


if __name__ == '__main__':
    root = tk.Tk()
    App(root).grid()
    root.mainloop()