How do I avoid KeyError when working with dictionaries?

Question

Right now I\'m trying to code an assembler but I keep getting this error:

Traceback (most recent call last):
  File \"/Users/Douglas/Documents/NeWS.py\", line 44,         


        

Answer 1

There is no key 'LD' in registerTable. Can put a try except block :

try:
   a=registerTable[item]
      ...
except KeyError:
   pass