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If stack exists (which equates to False if stack is empty)
AND
The table lookup for the current iteration of x is equivalent to the element atop stack
It might be helpful to take a look at the .get() method:
get(key[, default])Return the value for key if key is in the dictionary, else default. If default is not given, it defaults to None, so that this method never raises a KeyError.
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That line is saying:
If stack exists (which equates to False if stack is empty)
AND
The table lookup for the current iteration of x is equivalent to the element atop stack
It might be helpful to take a look at the .get() method: get(key[, default]) Return the value for key if key is in the dictionary, else default. If default is not given, it defaults to None, so that this method never raises a KeyError.