Features
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If there is no value corresponding to the local variable name in a function, the name can be found based on the LGB rule.
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Namespace: An area that contains the variable name
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Local scope: A namespace and local domain inside a function
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Global scope: Global domain outside a function
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Built-in scope: The domain related to the contents defined by Python and an internal domain
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LGB rule: The order of finding a variable name. local → global → built-in
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Example
Python
# Error: can't find simple_pi in circle_area
simple_pi = 3.14
def circle_area(r):
return r*r*simple_pi
# simple_pi should be declared as global if it is used in circle_area_ok
def circle_area_ok(r):
global simple_pi
return r*r*simple_pi
tp_log(str(circle_area(3.0)))
#expected result: 28.26