4 ms·

Ah, yeah, compared to the examples in the video that makes so much sense in a normal day to day application. I commonly do the following operations without much

• reportgunner 4y ago
  [] + [] is more likely to happen than taking list.append(value) and defining a function that does list.append(value) and then returns whatever list.append(value) returns. Hint: list.append(value) returns None
  • xdennis 4y ago
    `[] + []` is unlikely to happen except by accident if you don't know that's how array concatenation is done in JavaScript. But wanting to provide default values of [] is quite common in Python. Seeing this workaround is quite common in Python: def func(arg=None): if arg is None: arg = [] ...
    • reportgunner 4y ago
      I'm talking about the following where we don't intend to do [] + [] but we feed some lists to some functions that do something to the lists and we end up with empty lists in some cases without inspecting the contents of a and b after we feed it to the functions. Why would you define a default argument of an empty list if you're not gonna check if it's a list and if it's empty? a = [1,2] someFunction(a) b = [3,4] someOtherFunction(b) a + b