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