here is a example 9-18.pp3e\gui\tour\entry2.py from the book "programming
python(third edition)",
i revise it as following,change the "fetch(entries)" to "fetch(event,entries)"
,and add ,event.widget
to understand lambda is my goal,
there is a question i can't solve,when i click button ,wrong output :
TypeError: <lambda>() takes exactly 1 argument (0 given)
would you kind to tell me how to revise it?
command= (lambda event: fetch(event,ents)) #it is wrong ,but i don't know
how to revise it?
from Tkinter import *
from quitter import Quitter
fields = 'Name', 'Job', 'Pay'
def fetch(event,entries):
for entry in entries:
print 'Input => "%s"' % entry.get() ,event.widget # get text
def makeform(root, fields):
entries = []
for field in fields:
row = Frame(root) # make a new row
lab = Label(row, width=5, text=field) # add label, entry
ent = Entry(row)
row.pack(side=TOP, fill=X) # pack row on top
lab.pack(side=LEFT)
ent.pack(side=RIGHT, expand=YES, fill=X) # grow horizontal
entries.append(ent)
return entries
if __name__ == '__main__':
root = Tk()
ents = makeform(root, fields)
root.bind('<Return>', (lambda event,entries=ents: fetch(event,ents)))
Button(root, text='Fetch',
command= (lambda event: fetch(event,ents))).pack(side=LEFT)
Quitter(root).pack(side=RIGHT)
root.mainloop()_______________________________________________
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