[Tutor] help, thanks very much.

[bill.wu]

i am new guy.
i ask a easy question.
 
why the first one have"x",the second one doesn't have "x". what is different? when write "x",when don't write "x".

in my point,the second one don't def variable.

(1)

def func(x):
    print 'x is', x
    x = 2
    print 'Changed local x to', x

x = 50
func(x)
print 'x is still', x (2)

def func():
    global x

    print 'x is', x
    x = 2
    print 'Changed local x to', x

x = 50
func()
print 'Value of x is', x 
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