在python3 + gtk3中获取文本

Question

This is possibly more a python3 question the a gtk3 . In this following bit of code, print(numele) is working correctly, ie the connect function self.nument.connect("activate",self.get_nument) is ok.

from gi.repository import Gtk, GObject

class EntryWindow(Gtk.Window):

  def __init__(self):
    Gtk.Window.__init__(self, title="Entry Demo")
    self.set_size_request(100, 50)

    grid=Gtk.Grid()
    self.add(grid)

#Create Entry nument
    self.nument = Gtk.Entry()
    self.numlab = Gtk.Label()
    self.numlab.set_text("Number Of Element")
    self.nument.set_text("Number Of Element")
    self.nument.set_editable("TRUE")
    grid.attach(self.numlab, 0,2,1,1)      
    grid.attach(self.nument, 1,2,1,1)      
#Connect Entry nument
    self.nument.connect("activate",self.get_nument)

#Create Entry from numele
    for i in range(1,numele+1):
      self.entry = Gtk.Entry()
      self.entry.set_text("Hello World")
      self.entry.set_editable("FALSE")
      grid.attach(self.entry, 0,2+i,1,1)


    def get_nument(self,entry):
      numele= self.nument.get_text()
      print(numele)

win = EntryWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

But, in the for loop , it can not access the numele value.

 $python3 hw3.py 
Traceback (most recent call last):
  File "hw3.py", line 35, in <module>
    win = EntryWindow()
  File "hw3.py", line 24, in __init__
    for i in range(1,numele+1):
NameError: global name 'numele' is not defined

I am new to python. So, I am expecting numele is private to the function get_nument. What is the best way to use it outside the function(ie public)?

Kindly Help.

EDIT: after ptomato's reply I tried exactly that, with:

#Connect Entry nument
    self.nument.connect("activate",self.get_nument)
    print(self.numele)

and defining the function as:

def get_nument(self,entry): self.numele= self.nument.get_text()

Only to have error:

$ python3 test.py
Traceback (most recent call last):
  File "test.py", line 35, in <module>
    win = EntryWindow()
  File "test.py", line 21, in __init__
    self.nument.connect("activate",self.get_nument)
AttributeError: 'EntryWindow' object has no attribute 'get_nument'

Answer 1

You have exactly the right idea. The numele variable is locally scoped, so it gets deleted at the end of the function. Either return the value from your function, or store it self.numele instead. That stores it in your EntryWindow object so that it persists beyond the scope of the function.

PS. You might need to do int(numele) before you can use it in the range() call...

Answer 2

The code has several mistakes and I am not sure what you want to achieve. You probably want to have some Gtk.Entries based on the number from the first entry. Therefore, you have to move the for-loop into the get_nument method. This will still throw an error because get_nument is too much indented. Moreover, you need to convert the string from the Gtk.Entry to an integer. Finally, the grid has to be an attribute to be accessible for get_nument .

The result should look like this:

from gi.repository import Gtk, GObject

class EntryWindow(Gtk.Window):

    def __init__(self):
        Gtk.Window.__init__(self, title="Entry Demo")
        self.set_size_request(100, 50)

        self.grid=Gtk.Grid()
        self.add(self.grid)

        #Create Entry nument
        self.nument = Gtk.Entry()
        self.numlab = Gtk.Label()
        self.numlab.set_text("Number Of Element")
        self.nument.set_editable("TRUE")
        self.grid.attach(self.numlab, 0,2,1,1)
        self.grid.attach(self.nument, 1,2,1,1)
        #Connect Entry nument
        self.nument.connect("activate",self.get_nument)



    def get_nument(self,entry):
        numele= self.nument.get_text()
        print(numele)
        #Create Entry from numele
        for i in range(1,int(numele)+1):
            entry = Gtk.Entry()
            entry.set_text("Hello World")
            entry.set_editable("FALSE")
            entry.show()
            self.grid.attach(entry, 0,2+i,1,1)

win = EntryWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()

This code still has problems, for example if a lower number is entered, the entries are not removed from the grid.