4 ms·

This is required due to Python's semantics. You can't optimize that away unless the code is written to explicitly turn a global into a local.

• dalke 11y ago
  Here's an example of why mborch's statement is true: class A: def __init__(self, value=0): self.b = value def __str__(self): if self.b == 0: global a a = A(1) elif self.b == 1: import __builtin__, __main__ __builtin__.a = 2 del __main__.a return str(self.b) a = A() def foo(): print a print a print a foo() This generates: 1 2 3 but it's a different 'a' in all three cases; the last isn't even from the module's namespace.
  • stctgion 11y ago
    pretty sure that produces 0,1,2
    • dalke 11y ago
      Good catch! Yes, the output was from my first version. I rewrote it to be more explicit about changing the 'a' each time, and forgot to update the output section.