Question

question: 18
which of the following choices is a properly formed python variable name, meaning it is both legal in the python
language and considered good style?
user_age
userage
user!age!
1user_age
question: 19
which of the following choices is not a python variable type?
int
str
float
number

Explanation:

Question 18

In Python, variable names must start with a letter or underscore, followed by letters, numbers, or underscores. Good style (PEP 8) recommends using lowercase with underscores for multi - word names (snake_case).

• user_age: Follows the rules (starts with letter, uses underscore for multi - word) and is in snake_case (good style).
• uSeRaGe: While it is a legal variable name (starts with letter, has letters), it does not follow PEP 8 naming convention (should be snake_case).
• user!age!: Contains an illegal character (!).
• 1user_age: Starts with a number (illegal).

In Python:

• int is the integer variable type.
• str is the string variable type.
• float is the floating - point variable type.
• There is no built - in variable type named number (Python has int, float, complex for numeric types).

Answer:

user_age

Question 19