Tkinter Entry only allows digit number

最新推荐文章于 2023-11-23 14:47:00 发布

原创最新推荐文章于 2023-11-23 14:47:00 发布 · 1.6k 阅读

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#Tkinter #python #entry

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本文介绍如何使用Python的Tkinter库实现输入验证，并详细解释了如何在Tkinter组件中应用验证命令来确保用户输入的数据符合特定条件，如只能输入数字。通过实例演示了如何配置验证命令和Tkinter Entry组件的验证过程。

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from Tkinter import *
def validatecontent(S):
    print "S='%s'" % S
    return (S.isdigit()==bool(S))   #can only input digit number,and must use this format  **S**==**S**
vcmd=(top.register(validatecontent),'%S')   #use S,the text string being inserted
# valid percent substitutions (from the Tk entry man page)
# %d = Type of action (1=insert, 0=delete, -1 for others)
# %i = index of char string to be inserted/deleted, or -1
# %P = value of the entry if the edit is
# %s = value of entry prior to editing
# %S = the text string being inserted or deleted, if any
# %v = the type of validation that is currently set
# %V = the type of validation that triggered the callback
#      (key, focusin, focusout, forced)
# %W = the tk name of the widget
entry2=Entry(top,textvariable=e2,validate='all',validatecommand=vcmd)
entry2.pack()