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Tue Jul 4 16:16:59 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-July/066984.html

> Borrowing from Perl, the keyword 'my' is used to declare an explicitly
> scoped variable:
> 
>     def f1():
>        my x = 1
>        def f2():
>           x = 2   # Does not create a new x
> 
> In the above example, the statement 'my x = 1' declares that the scope
> of the variable 'x' is the outer function f1. Any assignment to x will
> modify the existing x, rather than creating a new definition.

-1, for this reason:

	def f()
		x = 2		# Does this create a local variable?

Today, the answer is yes.  Under this proposal, you can't answer the
question without inspecting the entire context in which f is defined.

For that reason, I would much rather have the first assignment in a block
say explicitly whether it is intended to create a local variable:

	def f1():
	   x = 1
	   def f2():
	      global x
	      x = 2    # Does not create a new x

This might even be abbreviated:

	def f1():
	   x = 1
	   def f2():
	      global x = 2   # Equivalent to the last example above

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Showing content from https://mail.python.org/pipermail/python-dev/2006-July/066984.html below:

[Python-Dev] Explicit Lexical Scoping (pre-PEP?)