Why does this UnboundLocalError occur (closure)?

closurespythonscopeglobal-variables
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What is the purpose of a self executing function in javascript?

javascriptclosuresiifeself-executing-function
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Local variables in nested functions

closurespythonscopenested-function
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How are lambdas useful? [closed]

closuresfunctionpythonlambda
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What are 'closures' in .NET?

.netclosures
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