def __init__(self, parent=None, **options):
Frame.__init__(self, parent, **options)
self.pack()
Label(self, text='Basic demos').pack()
for (key, value) in demos.items():
Button(self, text=key, command=value).pack(side=TOP, fill=BOTH)
Quitter(self).pack(side=TOP, fill=BOTH)
def __init__(self,parent=None):
Frame.__init__(self,parent)
self.pack()
Label(self,text='Basic demos').pack()
for (key,value)in demos.items():
func=(lambda key=key: self.printit(key))
Button(self,text=key,command=func).pack(side=TOP,fill=BOTH)
def __init__(self, parent=None, **options):
Frame.__init__(self, parent, **options)
self.pack()
Label(self, text='Basic demos').pack()
for (key,value) in demos.items():
Button(self, text=key, command=value).pack(side=TOP, fill=BOTH)
Quitter(self).pack(side=TOP, fill=BOTH)
def __init__(self,parent=None):
Frame.__init__(self,parent)
self.pack()
Label(self,text="Basic demos").pack()
for (key,value) in demos.items():
Button(self,text=key,command=value).pack(side=TOP,fill=BOTH)
from Tkinter import *
from dialogtable import demos
class Demo(Frame):
def __init__(self,parent=None):
Frame.__init__(self,parent)
self.pack()
Label(self,text='Basic demos').pack()
for (key,value)in demos.items():
func=(lambda key=key: self.printit(key))
Button(self,text=key,command=func).pack(side=TOP,fill=BOTH)
def printit(self,name):
print name,'returns =>',demos[name]()
if __name__=='__main__': Demo().mainloop()
note:the callback handler is an anoymous function made with a lambda now,In
practice, the lambda could appear within the call to Button itself because it
is an expression and it need not be assigned to a name,we alse can use it like
the following:
func=(lambda self =self,name=key: self.printit(name))
func=(lambda handler=self.printit,name=key: handler(name))
we can write the def function instead of lambda:
for (key,value) in demos.items():
def func(key=key): self.printit(key)
lambda is very import in widget .
lambda is used in Button,when the command call the
function(command=fuctionname(argument),if the function has argument,use the
lambda,if the function has no argument,you can use(command=function).lambda
make the command function to run with the argument.
