959
COStop printing memory addresses! 🛑🐍
If you’ve ever seen <map object at 0x7f8...> in your console, you’re looking at a “Lazy Iterator,” not a container.
❌ THE FAIL:
Python Code:
nums = [1, 2, 3]
result = map(lambda x: x*2, nums)
print(result) # Output: <map object at 0x7f8...>
✅ THE FIX:
Python Code:
# You must ‘consume’ the iterator to see the data
print(list(result)) # Output: [2, 4, 6]
⚙️ Why this matters: A map is just a set of instructions. It doesn’t actually do the math until you “trigger” it with list() or a for loop. This is Lazy Evaluation, and it’s how Python processes billions of rows without crashing your computer.
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