PyQt generate Button-Connectors

Question

I want to generate automatically the button-connections... but dont work:

    self._ = {}
    j = 0
    for i in self.btn:
        self._[i] = 'self._' + repr(j)
        print self._[i]
        self.button[i].clicked.connect(self._[i])
        j += 1

should bind the button[i] at the function _j ( def _1(self): / def _2(self): / ... but at execute:

connect() slot argument should be a callable or a signal, not 'str'

how to fix it?

M4rtini · Accepted Answer · 2014-01-18T19:11:38.503

1

The error message says it all, you need to pass a function or signal. Try to use getattrto get the function the string is representing.

Something like this may work

self.button[i].clicked.connect(getattr(self, '_'.format(j)))

edited Jan 18 '14 at 19:11

answered Jan 18 '14 at 19:00

M4rtini

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What are the Prams of this function? the first is `self`, the second the `name of the function` but the third? – Tekkzz Jan 18 '14 at 19:05
There is no third argument there. – M4rtini Jan 18 '14 at 19:06
I have: `self.button[i].clicked.connect(setattr(self, self._[i]))` And the error: `TypeError: setattr expected 3 arguments, got 2` – Tekkzz Jan 18 '14 at 19:09
1

you wrote the wrong function, it should be getattr, not setattr. That was from the other answer. I made a edit now so reread the answer. – M4rtini Jan 18 '14 at 19:12

score 0 · Answer 2 · edited May 23 '17 at 11:49

Try creating an actual callable method instead of sending the string to connect():

def make_slot(self, i):
    print 'clicked %i' % i 

self._ = {}
for i in self.btn:
    slot = self.make_slot(i)
    self._[i] = slot
    self.button[i].clicked.connect(slot)

(The make_slot function is to prevent python late-binding quirkiness, see Creating functions in a loop about that)

Also, instead of building a dict, maybe you could add the slots directly to self:

setattr(self, 'on_button_%i_clicked' % i, slot) # perhaps more convenient?

That way, you could refer to them separately as self.on_button_42_clicked if you need too.

PyQt generate Button-Connectors

2 Answers2