global Statement : global « Function « Python Tutorial

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Python Tutorial » Function » global 
10. 10. 2. global Statement
def foo():
    print "\ncalling foo()..."
    bar = 200
    print "in foo(), bar is", bar

bar = 100
print "in __main__, bar is", bar
foo()
print "\nin __main__, bar is (still)", bar

is_this_global = 'xyz'

def foo():
     global is_this_global
     this_is_local = 'abc'
     is_this_global = 'def'
     print this_is_local + is_this_global

foo()
print is_this_global
10. 10. global
10. 10. 1. only the most local and global namespaces can be modified
10. 10. 2. global Statement
10. 10. 3. Scoping example.
10. 10. 4. Demonstrates global variables
10. 10. 5. The global Statement
10. 10. 6. declare it in a global statement:
10. 10. 7. Within a function, you can't use both local and global versions of the same name
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