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Asked: 2026-05-16T03:58:24+00:00

If I call QApplication’s init without arguments i get TypeError: arguments did not match

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If I call QApplication’s init without arguments i get

TypeError: arguments did not match any overloaded call:
  QApplication(list-of-str): not enough arguments
  QApplication(list-of-str, bool): not enough arguments
  QApplication(list-of-str, QApplication.Type): not enough arguments
  QApplication(Display, int visual=0, int colormap=0): not enough arguments
  QApplication(Display, list-of-str, int visual=0, int cmap=0): not enough arguments

very interesting! How can I write a class like that?? I mean, every trick for this kind of function overloading I saw did not involve explicit signatures.

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1 Answer

  1. Editorial Team

    TypeError is just another Exception. You can take *args **kwargs, check those, and raise a TypeError yourself, specify the text displayed – e.g. listing the expected call.

    That being said, PyQt is a bunch of .pyd == native python extension, written in C or C++ (using Boost::Python). At least the latter supports “real” overloads afaik.

    Either way, you shouldn’t do this unless you have a really good reason. Python is duck-typed, embrace it.

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