Demonstrates global variables
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def read_global():
print "From inside the local namespace of read_global(), value is:", value
def shadow_global():
value = -10
print "From inside the local namespace of shadow_global(), value is:", value
def change_global():
global value
value = -10
print "From inside the local namespace of change_global(), value is:", value
# main
# value is a global variable because we're in the global namespace here
value = 10
print "In the global namespace, value has been set to:", value, "n"
read_global()
print "Back in the global namespace, value is still:", value, "n"
shadow_global()
print "Back in the global namespace, value is still:", value, "n"
change_global()
print "Back in the global namespace, value has now changed to:", value
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