Code

 1 from tkinter import *
 2 from tkinter import ttk
 3 
 4 
 5 def calculate(*args):
 6     try:
 7         value = float(feet.get())
 8         meters.set((0.3048 * value * 10000.0 + 0.5) / 10000.0)
 9     except ValueError:
10         pass
11 
12 
13 root = Tk()
14 root.title("Feet to Meters")
15 mainframe = ttk.Frame(root, padding="3 3 12 12")
16 # mainframe = ttk.Frame(root)
17 mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
18 mainframe.columnconfigure(0, weight=1)
19 mainframe.rowconfigure(0, weight=1)
20 feet = StringVar()
21 meters = StringVar()
22 feet_entry = ttk.Entry(mainframe, width=7, textvariable=feet)
23 feet_entry.grid(column=2, row=1, sticky=(W, E))
24 ttk.Label(mainframe, textvariable=meters).grid(column=2, row=2, sticky=(W, E))
25 ttk.Button(mainframe, text="Calculate", command=calculate).grid(column=3, row=3,
26                                                                 sticky=W)
27 ttk.Label(mainframe, text="feet").grid(column=3, row=1, sticky=W)
28 ttk.Label(mainframe, text="is equivalent to").grid(column=1, row=2, sticky=E)
29 ttk.Label(mainframe, text="meters").grid(column=3, row=2, sticky=W)
30 for child in mainframe.winfo_children(): child.grid_configure(padx=5, pady=5)
31 
32 for child in mainframe.winfo_children():
33     print(child)
34 feet_entry.focus()
35 root.bind('<Return>', calculate)
36 root.mainloop()

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FeetToMeters

 1 from tkinter import *
 2 from tkinter import ttk
 3 
 4 
 5 class FeetToMeters:
 6 
 7     def __init__(self, root):
 8         root.title("Feet to Meters")
 9         mainframe = ttk.Frame(root, padding="3 3 12 12",relief="groove",borderwidth=3)  # padding=(左,上,右,下)
10         mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
11         root.columnconfigure(0, weight=1)
12         root.rowconfigure(0, weight=1)
13 
14         self.feet = StringVar(value=1)
15         feet_entry = ttk.Entry(mainframe, width=7, textvariable=self.feet)
16         feet_entry.grid(column=2, row=1, sticky=(W, E))
17         self.meters = StringVar()
18 
19         ttk.Label(mainframe, textvariable=self.meters).grid(column=2, row=2, sticky=(W, E))
20         ttk.Button(mainframe, text="Calculate", command=self.calculate).grid(column=3, row=3, sticky=W)
21 
22         ttk.Label(mainframe, text="feet").grid(column=3, row=1, sticky=W)
23         ttk.Label(mainframe, text="is equivalent to").grid(column=1, row=2, sticky=E)
24         ttk.Label(mainframe, text="meters").grid(column=3, row=2, sticky=W)
25 
26         for child in mainframe.winfo_children():
27             child.grid_configure(padx=5, pady=5)   # 各组件之间上下左右的间距为5 ;
28 
29         feet_entry.focus()  # 窗口打开后光标自动移动到 输入框 ;
30         root.bind("<Return>", self.calculate)
31 
32     def calculate(self, *args):
33         try:
34             value = float(self.feet.get())
35             self.meters.set(int(0.3048 * value * 10000.0 + 0.5) / 10000.0)
36         except ValueError:
37             pass
38 
39 
40 if __name__ == '__main__':
41     root = Tk()
42     FeetToMeters(root)
43     root.mainloop()

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