关于tkinter的entry控件文本插入

hacktor

写了个计算器程序，文本插入采用的是insert方法，但是这样插入的文本会出现在文本框首部。比如我先insert了1，再insert2，文本框显示的是21，请问有什么解决方法？

1. #!/usr/bin/python
   
2. #-*- coding:utf-8 -*-
   
3. 
   
4. import os, sys
   
5. try:
   
6.     from tkinter import *
   
7. except ImportError:  #Python 2.x
   
8.     PythonVersion = 2
   
9.     from Tkinter import *
   
10.     from tkFont import Font
    
11.     #Usage:showinfo/warning/error,askquestion/okcancel/yesno/retrycancel
    
12.     from tkMessageBox import *
    
13.     #Usage:f=tkFileDialog.askopenfilename(initialdir='E:/Python')
    
14.     #import tkFileDialog
    
15.     #import tkSimpleDialog
    
16.     #import tkinter.filedialog as tkFileDialog
    
17.     #import tkinter.simpledialog as tkSimpleDialog    #askstring()
    
18. 
    
19. 
    
20. #所有控件和控件绑定变量引用字典，使用这个字典是为了方便在其他函数中引用所有控件。
    
21. gComps = {}
    
22. 
    
23. 
    
24. def Command1_Cmd(event=None):
    
25.     Text1.insert(0,"1")
    
26.     pass
    
27. 
    
28. def Command2_Cmd(event=None):
    
29.     Text1.insert(0,"2")
    
30.     pass
    
31. 
    
32. def Command3_Cmd(event=None):
    
33.    Text1.insert(0,"3")
    
34.    pass
    
35. 
    
36. def Command4_Cmd(event=None):
    
37.     Text1.insert(0,"4")
    
38.     pass
    
39. 
    
40. def Command5_Cmd(event=None):
    
41.     Text1.insert(0,"5")
    
42.     pass
    
43. 
    
44. def Command6_Cmd(event=None):
    
45.     Text1.insert(0,"6")
    
46.     pass
    
47. 
    
48. def Command7_Cmd(event=None):
    
49.     Text1.insert(0,"7")
    
50.     pass
    
51. 
    
52. def Command8_Cmd(event=None):
    
53.     Text1.insert(0,"8")
    
54.     pass
    
55. 
    
56. def Command9_Cmd(event=None):
    
57.     Text1.insert(0,"9")
    
58.     pass
    
59. 
    
60. def Command_sub_Cmd(event=None):
    
61.     Text1.insert(0,"-")
    
62.     pass
    
63. 
    
64. def Command_equal_Cmd(event=None):
    
65.     res=Text1.get()
    
66.     Text1.insert(0,"=%d"%eval(res))
    
67.     pass
    
68. 
    
69. def Command_chu_Cmd(event=None):
    
70.     Text1.insert(0,"/")
    
71.     pass
    
72. 
    
73. def Command_cheng_Cmd(event=None):
    
74.     Text1.insert(0,"*")
    
75.     pass
    
76. 
    
77. def Command_add_Cmd(event=None):
    
78.     Text1.insert(0,"+")
    
79.     pass
    
80. 
    
81. 
    
82. def main(argv):
    
83.     top = Tk()
    
84.     top.title('计算器')
    
85.     top.geometry('483x468')
    
86.     gComps['top'] = top
    
87. 
    
88.     Text1Var = StringVar(value='')
    
89.     global Text1
    
90.     Text1 = Entry(top, text=Text1Var)
    
91.     Text1.place(x=24, y=16, width=353, height=57)
    
92.     gComps['Text1'] = Text1
    
93.     gComps['Text1Var'] = Text1Var
    
94. 
    
95.     Command1 = Button(top, text='1', command=Command1_Cmd)
    
96.     Command1.place(relx=0.05, rely=0.205, relwidth=0.201, relheight=0.173)
    
97.     gComps['Command1'] = Command1
    
98. 
    
99.     Command2 = Button(top, text='2', command=Command2_Cmd)
    
100.     Command2.place(relx=0.315, rely=0.205, relwidth=0.201, relheight=0.173)
     
101.     gComps['Command2'] = Command2
     
102. 
     
103.     Command3 = Button(top, text='3', command=Command3_Cmd)
     
104.     Command3.place(relx=0.58, rely=0.205, relwidth=0.201, relheight=0.173)
     
105.     gComps['Command3'] = Command3
     
106. 
     
107.     Command4 = Button(top, text='4', command=Command4_Cmd)
     
108.     Command4.place(relx=0.05, rely=0.462, relwidth=0.201, relheight=0.173)
     
109.     gComps['Command4'] = Command4
     
110. 
     
111.     Command5 = Button(top, text='5', command=Command5_Cmd)
     
112.     Command5.place(relx=0.315, rely=0.462, relwidth=0.201, relheight=0.173)
     
113.     gComps['Command5'] = Command5
     
114. 
     
115.     Command6 = Button(top, text='6', command=Command6_Cmd)
     
116.     Command6.place(relx=0.58, rely=0.462, relwidth=0.201, relheight=0.173)
     
117.     gComps['Command6'] = Command6
     
118. 
     
119.     Command7 = Button(top, text='7', command=Command7_Cmd)
     
120.     Command7.place(relx=0.05, rely=0.718, relwidth=0.201, relheight=0.173)
     
121.     gComps['Command7'] = Command7
     
122. 
     
123.     Command8 = Button(top, text='8', command=Command8_Cmd)
     
124.     Command8.place(relx=0.315, rely=0.718, relwidth=0.201, relheight=0.173)
     
125.     gComps['Command8'] = Command8
     
126. 
     
127.     Command9 = Button(top, text='9', command=Command9_Cmd)
     
128.     Command9.place(relx=0.58, rely=0.718, relwidth=0.201, relheight=0.173)
     
129.     gComps['Command9'] = Command9
     
130. 
     
131.     Command_sub = Button(top, text='-', command=Command_sub_Cmd)
     
132.     Command_sub.place(relx=0.828, rely=0.222, relwidth=0.135, relheight=0.122)
     
133.     gComps['Command_sub'] = Command_sub
     
134. 
     
135.     Command_equal = Button(top, text='=', command=Command_equal_Cmd)
     
136.     Command_equal.place(relx=0.828, rely=0.735, relwidth=0.135, relheight=0.156)
     
137.     gComps['Command_equal'] = Command_equal
     
138. 
     
139.     Command_chu = Button(top, text='%', command=Command_chu_Cmd)
     
140.     Command_chu.place(relx=0.828, rely=0.564, relwidth=0.135, relheight=0.122)
     
141.     gComps['Command_chu'] = Command_chu
     
142. 
     
143.     Command_cheng = Button(top, text='x', command=Command_cheng_Cmd)
     
144.     Command_cheng.place(relx=0.828, rely=0.393, relwidth=0.135, relheight=0.122)
     
145.     gComps['Command_cheng'] = Command_cheng
     
146. 
     
147.     Command_add = Button(top, text='+', command=Command_add_Cmd)
     
148.     Command_add.place(relx=0.828, rely=0.051, relwidth=0.135, relheight=0.122)
     
149.     gComps['Command_add'] = Command_add
     
150. 
     
151.     top.mainloop()
     
152.     try: top.destroy()
     
153.     except: pass
     
154. 
     
155. 
     
156. 
     
157. if __name__ == "__main__":
     
158.     main(sys.argv)
     

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hacktor

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