My current understanding of Python's built-in functions and dunder or magic methods is that they are linked to each other. For example, if you create a list object and use the len-function the list object's dunder method __len__ is finally called. a = [1,2,3] len(a) # is equal to a.__len__() However, this seams different with a string object and integer conversion. a = "3" i = int(a) # --> don't call a.__int__() print(dir(a)) # --> __int__() event don't exist I always thought that the built-in functions only work if the equivalent dunder method exists. But that doesn't seem to be the case. Why and how does the conversion really work? Continue reading...
