Problem Statement
Compare EAFP and LBYL in Python error handling. When is each better?
Explanation
Easier to ask forgiveness than permission uses try and except. You attempt the operation and handle failure. It is concise and safe under races where the world can change between a check and an action.
Look before you leap tests conditions first. It can be clearer when errors are expensive or truly exceptional. In Python, prefer EAFP when interacting with dictionaries, files, or concurrency. Use LBYL for validation paths where exceptions would be noisy.
Code Solution
SolutionRead Only
# EAFP
d = {}
try:
v = d['x']
except KeyError:
v = 0
# LBYL
v = d['x'] if 'x' in d else 0