Even though it looks pretty simple, its was very confusing for me at the time.
So, lets have a look at the example below:
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In one code snippet, the global variableXgives anUnboundLocalError.
However, when we have a go at print the variable, it works.
The has to do with scoping.
When you make an assignment to a variable in a scope (e.g.
This is what happened in the first scenario when we didx += 1.
Or if we are lucky, we get an error and easily notice it.
But let me give you an example of what I mean.
Even today, I sometimes make this mistake.
In any case, its a bad situation to have.
A classic mistake is the following:
By simply creating a variable namedlistwe broke the access to thelistfunction.
This article was originally published onLive Code StreambyJuan Cruz Martinez, founder and publisher of Live Code Stream.
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