Python 3 Review Part 1

Front

Comments in Python are primarily used for what purpose?

Back

To explain the code to humans

Answer explanation

Comments in Python are primarily used to explain the code to humans, making it easier to understand and maintain. They do not affect the execution speed, user input, or function definitions.

Front

What does the function `int(input("Base: "))` do in the code?

Back

It takes input and converts it to an integer.

Answer explanation

The function `int(input("Base: "))` prompts the user for input, takes that input as a string, and then converts it to an integer. Therefore, the correct choice is that it takes input and converts it to an integer.

Front

What is the purpose of the `str()` function in the program?

Back

To convert a number to a string

Answer explanation

The `str()` function is used to convert a number to a string, allowing for easier manipulation and display of numerical values as text. This makes 'To convert a number to a string' the correct choice.

Front

What is the role of the '0.5' in the area calculation?

Back

It calculates half of the product

Answer explanation

The '0.5' in the area calculation represents a factor that calculates half of the product of the base and height. This is essential for determining the area of a triangle, where the area is half the product of its base and height.

Front

Which function is used to convert user input into an integer?

Back

int()

Answer explanation

The function int() is used to convert user input, which is typically a string, into an integer. The other options serve different purposes: float() converts to a float, str() converts to a string, and input() captures user input.

Front

What is the role of comments in a program?

Back

To describe the program

Answer explanation

Comments in a program serve to describe the code, making it easier for others (and the original author) to understand its purpose and functionality. They do not execute code, increase speed, or reduce memory usage.

Front

Which of the following is the correct way to declare a tuple? Options: x = (1, 2, 3), x = [1, 2, 3]

Back

x = (1, 2, 3)

Answer explanation

The correct way to declare a tuple in Python is using parentheses, as shown in 'x = (1, 2, 3)'. The other option, 'x = [1, 2, 3]', uses square brackets, which denotes a list, not a tuple.

Front

Which of the following is NOT true about tuples?

• Tuples are ordered.
• Tuples are immutable.
• Tuples can contain elements of different types.
• Tuples use parentheses to access individual elements, rather than square brackets.

Back

Tuples use parentheses to access individual elements, rather than square brackets.

Answer explanation

The statement 'Tuples use parentheses to access individual elements, rather than square brackets' is NOT true. Tuples use parentheses for their definition, but elements are accessed using square brackets, similar to lists.

Front

How is a float different from an integer?

Back

It has a decimal component

Answer explanation

A float differs from an integer in that it has a decimal component, allowing for fractional values. Integers are whole numbers without any decimal part.

Front

Which of the following is NOT a float? Options: 5.5, 0.0, 7, 3.14

Back

7

Answer explanation

A float is a number that has a decimal point. Among the options, 5.5, 0.0, and 3.14 are floats because they contain decimal points. The number 7 is an integer, thus it is NOT a float.