4 ms·

Also see assignment expressions recently adopted in python 3.8: https://www.python.org/dev/peps/pep-0572/ https://www.python.org/dev/peps/pep-0572/

• sbergot 7y ago
  In Python things are a bit different because declarations and assignments are ambiguous.
  • empyrical 7y ago
    Also its addition to Python was controversial, to say the least. (I have been enjoying using it, however)
  • masklinn 7y ago
    They're not ambiguous, assignments are declarations unless the variable was pre-declared (via global or nonlocal). Assignment was specifically made a statement to avoid the confusion / typo risks of `=` v `==`.
    • sbergot 7y ago
      They are not ambiguous if you have the whole file in your head. This is why there are keywords like "global" & "nonlocal".
      • masklinn 7y ago
        > They are not ambiguous if you have the whole file in your head. They're not ambiguous period, python's `=` always performs a local declaration unless overridden via the keywords you mentioned. > This is why there are keywords like "global" & "nonlocal". It's the exact opposite of your statement: `global` and `nonlocal` indicate non-local bindings, because by default all bindings are local and you do not need to have "the whole file in your head".