Two thoughts:
1. Nested list comprehensions are incomprehensible. The reader has to pause and spend 30 seconds to figure out what’s happening; then maybe get it wrong. Please, from a senior engineer who has to review code every day: Just. don’t.
2. There’s a mistake in the dictionary comprehension; you mean
print({ i: len(i) for i in apple_names})
Written by Tom Clark
Fluid Dynamicist at the core, lover of chaos theory. Experienced scientist, developer and team lead working in wind energy — from startups to heavy industry.