You want to write a method that returns a dictionary with keys as numbers from 1 to n and values as their squares. Which method below correctly does this?
hard📝 Application Q15 of 15
Python - Methods and Behavior Definition
You want to write a method that returns a dictionary with keys as numbers from 1 to n and values as their squares. Which method below correctly does this?
Adef squares(n):
result = {}
for i in range(1, n+1):
result[i] = i * i
return result
Bdef squares(n):
result = []
for i in range(n):
result.append(i * i)
return result
Cdef squares(n):
return {i: i + i for i in range(1, n)}
Ddef squares(n):
for i in range(1, n+1):
print(i * i)
Step-by-Step Solution
Solution:
Step 1: Understand the requirement
The method must return a dictionary with keys 1 to n and values as squares.
Step 2: Check each option
The loop building result = {}, setting result[i] = i * i for i in range(1, n+1), and returning result is correct. Returning a list fails. The comprehension {i: i + i for i in range(1, n)} uses doubles instead of squares and misses key n. Printing without returning fails.
Final Answer:
def squares(n):
result = {}
for i in range(1, n+1):
result[i] = i * i
return result -> Option A
Quick Check:
Return dict with squares = def squares(n):
result = {}
for i in range(1, n+1):
result[i] = i * i
return result [OK]
Quick Trick:Return dict with keys and squares using loop [OK]
Common Mistakes:
Returning list instead of dict
Using wrong range limits
Printing instead of returning
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