CODEWITHSUNDEEP
pythonqtqt4pyqtpyqt4
j b
j b

Reputation: 5306

Why is PyQt connect() syntax so verbose?

I'm just learning PyQt and looking at the Signals and Slots mechanism. I'm a bit baffled by the verbose syntax. Why do we have:

self.connect(dial, SIGNAL("valueChanged(int)"), spinbox.setValue)

I would much prefer to write the following:

self.connect(dial.valueChanged, spinbox.setValue)

Can anyone tell me why the connect() syntax needs to be so explicit/verbose?

Upvotes: 8

Views: 2702

Answers (3)

Ramchandra Apte
Ramchandra Apte

Reputation: 4079

An even shorter way is to assign the signal name to the function in the keyword arguments of the constructor e.g. QDial(valueChanged=spinbox.setValue). PyQt will automatically connect the valueChanged() signal to spinbox.setValue().

Upvotes: 1

danodonovan
danodonovan

Reputation: 20373

Luper's answer is much better than this one, but for the sake of completeness...

The ugly "old style" syntax is an anachronism from the C++ world - just look at the syntax those guys have to work with! Yucky...

Upvotes: 2

Luper Rouch
Luper Rouch

Reputation: 9502

You can use PyQt's new style signals which are less verbose:

self.connect(dial, SIGNAL("valueChanged(int)"), spinbox.setValue)

Becomes:

dial.valueChanged.connect(spinbox.setValue)

Upvotes: 28

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