NameError: using a name Python does not know
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Which line causes a NameError?
score = 10
print(scor)
2. What happens when this code runs?
print(total)
total = 5
3. Which code runs without a NameError?
4. Which code prints the word hello without a NameError?
5. True or false: Python treats age and Age as the same variable.
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1print(scor) | ANameError: the variable was spelt score, so Python does not know scor | |
| 2print(Hello) | Bname = "Sam" print(Name) | |
| 3Capital letters matter, so Name and name are two different names | CNameError: Hello has no quotes, so Python thinks it is a variable name | |
| 4A variable must be assigned before it is used, or Python does not know it yet | Dtotal = 5 print(total) | |
| 5print(points) points = 10 | EThe variable points is used on line 1 before it is assigned on line 2, so Python raises a NameError. Assign it first, then print it. | |
| 6colour = "blue" print(colur) | FThe name is misspelt as colur, but the variable is colour. Fix the typo so both spellings match. |
C
Definitions
NameError
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
score = 10
print(_____)
2.
_____ = 5 + 2
print(total)
3.
Name = "Zoe"
print(____)
4.
pet = "cat"
print("My pet is", ___)
5.
for _ in range(3):
print(i)
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
name = Ava
B
age = 12
C
print(name)
D
print(age)
Question 2
A
score = 10
B
score = scor + 5
C
print(score)
Question 3
A
colour = "blue"
B
print("Sky is", Colour)
C
print(colour)
Question 4
A
def say_Hi():
B
print("Hi!")
C
say_hi()
Question 5
A
name = "Zoe"
B
age = 13
C
print("Hello", name)
D
print(Age, age)
Answer Key
NameError: using a name Python does not know
Section A: Quick Questions
Q1
B — print(scor)
Q2
B — NameError, because total is used before it is assigned
Q3
A — name = 'Mia'
print(name)
Q4
A — print('hello')
Q5
A — False
Section B: Match the Pairs
Q1
print(scor) → NameError: the variable was spelt score, so Python does not know scor
Q2
print(Hello) → NameError: Hello has no quotes, so Python thinks it is a variable name
Q3
Capital letters matter, so Name and name are two different names → name = "Sam"
print(Name)
Q4
A variable must be assigned before it is used, or Python does not know it yet → total = 5
print(total)
Q5
print(points)
points = 10 → The variable points is used on line 1 before it is assigned on line 2, so Python raises a NameError. Assign it first, then print it.
Q6
colour = "blue"
print(colur) → The name is misspelt as colur, but the variable is colour. Fix the typo so both spellings match.
Section C: Definitions
Q1
NameError — An error Python raises when code uses a variable or function name it does not know, often from a typo, wrong capitals, missing quotes or using a name before it is assigned.Section D: Fill in the Blanks
Q1
score = 10
print(score)Q2
total = 5 + 2
print(total)Q3
Name = "Zoe"
print(Name)Q4
pet = "cat"
print("My pet is", pet)Q5
for i in range(3):
print(i)Section E: Spot the Error
Q1
A — Ava is text, so it needs quotes. Without them Python looks for a variable called Ava and raises a NameError. It should be name = "Ava".
Q2
B — scor is a misspelling of score. Python does not know a name called scor, so it raises a NameError. It should be score = score + 5.
Q3
B — Capital letters matter in Python. Colour is not the same name as colour, so this raises a NameError. It should be print("Sky is", colour).
Q4
A — The function is defined as say_Hi, but the call uses say_hi. Capital letters matter, so Python raises a NameError at the call. It should be def say_hi():.
Q5
D — Age is a label, so it needs quotes. Without them Python looks for a variable named Age and raises a NameError. It should be print("Age", age).