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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

标签:Python,基础

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