Variable assignment in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is variable assignment in Python?

Variable assignment means giving a name to a value so you can use it later. For example, x = 5 means the name x now holds the value 5.

beginner

How do you assign multiple variables in one line in Python?

You can assign multiple variables by separating them with commas. For example, a, b = 1, 2 assigns 1 to a and 2 to b.

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What happens if you assign a new value to an existing variable?

The old value is replaced by the new one. For example, if x = 5 and then x = 10, x now holds 10.

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Can variable names in Python start with a number?

No, variable names cannot start with a number. They must start with a letter (a-z, A-Z) or an underscore (_).

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What is the difference between = and == in Python?

= is used to assign a value to a variable. == is used to check if two values are equal.

Which of the following is a valid variable assignment in Python?

A score = 100

B 100 = score

C score == 100

D score := 100

Option A correctly assigns 100 to the variable 'score'. Option B tries to assign to a number, which is invalid. Option C is a comparison, not assignment. Option D uses walrus operator which is valid in expressions but not for simple assignment statements.

What will be the value of 'a' after this code? <br> a = 5<br>a = 10

A 5

B 15

C 10

D Error

The second assignment replaces the first, so 'a' holds 10.

Which variable name is NOT valid in Python?

A value_2

B _value

C value2

D 2ndValue

Variable names cannot start with a number, so '2ndValue' is invalid.

How do you assign the values 1, 2, and 3 to variables x, y, and z in one line?

A x = y = z = 1, 2, 3

B x, y, z = 1, 2, 3

C x = 1; y = 2; z = 3

D x, y, z == 1, 2, 3

Option B correctly assigns 1 to x, 2 to y, and 3 to z in one line.

What does the '=' symbol do in Python?

A Assigns a value to a variable

B Checks if two values are equal

C Starts a comment

D Ends a statement

'=' assigns the value on the right to the variable on the left.

Explain how to assign a value to a variable in Python and what rules variable names must follow.

Think about how you give a name to a box and put something inside.

Describe what happens when you assign a new value to an existing variable.

Imagine replacing the content inside a labeled box.