Runtime errors in Python
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which error does this code cause?
print(score)
(score was never created)
2. What happens when this code runs?
age = int("hello")
3. Which line causes a ZeroDivisionError?
4. True or false: A runtime error is found only while the program is running.
5. When a program crashes with an error message, what should you read first?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1NameError: name 'score' is not defined | AThe variable is spelled nmae in print(), but it was created as name. This causes a NameError. Fix it by typing print(name). | |
| 2ZeroDivisionError: division by zero | BThe program tried to divide a number by 0, so it stopped running | |
| 3A ValueError happens when int() gets text that is not a whole number | Cage = int("hello") | |
| 4A runtime error stops the program at the line that fails, so later lines never run | Dprint("Start") x = 10 / 0 print("End") | |
| 5name = "Sam" print(nmae) | EThe program used a variable name that was never created, or it was spelled differently | |
| 6total = 50 share = total / 0 | FDividing by 0 causes a ZeroDivisionError. Fix it by dividing by a number that is not 0, such as total / 5. |
C
Definitions
runtime error
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
score = 10
print(_____)
2.
word = "cat"
num = int(word) # causes a __________
3.
people = 0
if ______ != 0:
print(10 / people)
4.
print(total)
# total was never made: _________
5.
# This line causes a ZeroDivisionError
print(10 / _)
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
players = 4
B
pizzas = 2
C
total = players + pizzas
D
print("Total:", totl)
Question 2
A
points = 20
B
average = points / 0
C
print(average)
Question 3
A
age = int("twelve")
B
next_age = age + 1
C
print("Next year:", next_age)
Question 4
A
name = "Mia"
B
score = 10
C
print(Mia, "scored", score)
Question 5
A
total = 30
B
count = 5
C
mean = total / (count - 5)
D
print(mean)
Answer Key
Runtime errors in Python
Section A: Quick Questions
Q1
B — NameError
Q2
A — ValueError: int() cannot turn the text into a whole number
Q3
B — print(10 / 0)
Q4
A — True
Q5
A — The error name and the line number
Section B: Match the Pairs
Q1
NameError: name 'score' is not defined → The program used a variable name that was never created, or it was spelled differently
Q2
ZeroDivisionError: division by zero → The program tried to divide a number by 0, so it stopped running
Q3
A ValueError happens when int() gets text that is not a whole number → age = int("hello")
Q4
A runtime error stops the program at the line that fails, so later lines never run → print("Start")
x = 10 / 0
print("End")
Q5
name = "Sam"
print(nmae) → The variable is spelled nmae in print(), but it was created as name. This causes a NameError. Fix it by typing print(name).
Q6
total = 50
share = total / 0 → Dividing by 0 causes a ZeroDivisionError. Fix it by dividing by a number that is not 0, such as total / 5.
Section C: Definitions
Q1
runtime error — An error that stops a program while it runs, shown as a named error like NameError, ValueError or ZeroDivisionError. Read the message to find the problem.Section D: Fill in the Blanks
Q1
score = 10
print(score)Q2
word = "cat"
num = int(word) # causes a ValueErrorQ3
people = 0
if people != 0:
print(10 / people)Q4
print(total)
# total was never made: NameErrorQ5
# This line causes a ZeroDivisionError
print(10 / 0)Section E: Spot the Error
Q1
D — The variable totl was never created, so Python stops with a NameError. The name must match the variable made earlier: total.
Q2
B — You cannot divide by zero. Python stops with a ZeroDivisionError. Divide by a number that is not zero, such as 4.
Q3
A — int() can only turn digit text like "12" into a number. The word "twelve" causes a ValueError. Use int("12").
Q4
C — Mia has no quote marks, so Python thinks it is a variable name that does not exist. This is a NameError. Use the variable name instead of Mia.
Q5
C — count - 5 is 0, so the program divides by zero and stops with a ZeroDivisionError. It should be total / count.