Python Mod 3 Sec 3

An expression in Python is:

• a piece of code that returns a value

• a type of loop

• a syntax error

• a function definition

Answer explanation

In Python, an expression is a piece of code that evaluates to a value, such as a number or a string. This distinguishes it from loops, syntax errors, and function definitions, making 'a piece of code that returns a value' the correct choice.

Which operator multiplies two values in Python?

• +

• -

• *

• /

Answer explanation

In Python, the '*' operator is used to multiply two values. The other operators listed serve different functions: '+' for addition, '-' for subtraction, and '/' for division.

Fill in the blank: The addition operator in Python is represented by ___.

• +

• -

• *

• /

Answer explanation

The addition operator in Python is represented by the symbol '+'. This operator is used to add two numbers or concatenate strings, making it the correct choice for this question.

Which of the following operators has the highest priority in Python?

• a) +

• b) **

• c) //

• d) %

Answer explanation

In Python, the exponentiation operator ** has the highest priority among the given options. It is evaluated before addition (+), floor division (//), and modulus (%), making b) ** the correct answer.

What is a unary operator?

• An operator that operates on a single operand

• An operator that operates on two operands

• An operator that operates on three operands

• An operator that does not operate on any operand

Answer explanation

A unary operator is defined as an operator that operates on a single operand, making the first answer choice correct. In contrast, operators that work on two or more operands are not unary.

Fill in the blank: A binary operator is an operator with two operands, e.g., 4 ___ 5.

• +

• -

• *

• /

Answer explanation

The correct answer is '+' because it is a binary operator that takes two operands, such as 4 and 5, to perform addition. Other options like '-', '*', and '/' are also binary operators, but the question specifically highlights '+'.

True or False: Subexpressions in parentheses are always calculated first in Python.

• True

• False

Answer explanation

True. In Python, expressions within parentheses are evaluated first, following the order of operations. This ensures that calculations inside parentheses take precedence over other operations.

What is the result of the expression 2 ** 2 ** 3 in Python?

• 16

• 64

• 256

• 512

Answer explanation

In Python, the expression 2 ** 2 ** 3 is evaluated as 2 ** (2 ** 3). First, 2 ** 3 equals 8, then 2 ** 8 equals 256. Therefore, the correct answer is 256.

What does the ** expression mean?

• this is not a valid python expression

• multiple the two numbers

• raise the number to that power

Answer explanation

The ** operator in Python is used to raise a number to a power. For example, 2 ** 3 equals 8, as it calculates 2 raised to the power of 3. Therefore, the correct answer is 'raise the number to that power'.

What does the '==' operator do in Python?

• Compares the memory addresses of two objects

• Performs addition between two values

• Checks if two objects are of the same type

• Checks for equality between two objects or values

Answer explanation

The '==' operator checks for equality between two objects or values, determining if they are equivalent in value, regardless of their memory addresses or types.