Python - Variables and Dynamic Typing
You want to calculate the total price of 3 items costing 10, 15, and 20 dollars. Which code correctly uses variables to do this?
You want to calculate the total price of 3 items costing 10, 15, and 20 dollars. Which code correctly uses variables to do this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Check variable assignments before use
Variablesprice1,price2, andprice3must be assigned values before adding.Step 2: Analyze each option
price1 = 10 price2 = 15 price3 = 20 total = price1 + price2 + price3 print(total) assigns prices first, then sums them. total = 10 + 15 + 20 print(total) sums constants directly (no variables for prices). print(10 + 15 + 20) prints sum directly without variables. total = price1 + price2 + price3 price1 = 10 price2 = 15 price3 = 20 print(total) sums variables before assigning them, causing error.Final Answer:
price1 = 10 price2 = 15 price3 = 20 total = price1 + price2 + price3 print(total) -> Option AQuick Check:
Assign variables before use, then sum [OK]
Quick Trick: Assign variables before using them in calculations [OK]
Common Mistakes:
MISTAKES- Using variables before assigning values
- Adding numbers directly without variables
- Confusing order of assignment and calculation
Master "Variables and Dynamic Typing" in Python
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