Python Semester Independant Review Part 1

What is the final result of the expression 4 + 5 * 3?

• 27

• 12

• 21

• 19

Answer explanation

To solve 4 + 5 * 3, follow the order of operations: first multiply 5 by 3 to get 15, then add 4. Thus, 4 + 15 equals 19, making 19 the correct answer.

What is the final result of the expression 7 / 2 + 6?

• 0

• 9.5

• 9

• 0.875

Answer explanation

To solve 7 / 2 + 6, first calculate 7 / 2 which equals 3.5. Then add 6: 3.5 + 6 = 9.5. Therefore, the final result is 9.5.

Choose the print statement below that will cause an error. Assume that num has the value 6, and name has the value "Isabella".

• print(name + ":" )

• print(num)

• print(name + " wants " + "num " + "candies")

• print(name + ": " + str(num))

• print(name + ": " + num)

Answer explanation

The statement print(name + ": " + num) will cause an error because num is an integer and cannot be concatenated directly with strings. It needs to be converted to a string using str(num) first.

Which one of the statements below will cause an error?

• ans = "hi" * 8

• ans = "hi" + 9

• ans = "hi" + "hi" + "hi"

• ans = ("a" * 4) + "b"

Answer explanation

The statement 'ans = "hi" + 9' will cause an error because you cannot concatenate a string with an integer in Python. The other statements are valid operations.

Suppose you have a variable defined a = "4". What is the variable type of a?

• str

• int

• float

• number

Answer explanation

The variable a is defined as a string with the value '4'. In Python, enclosing a value in quotes indicates it is a string, not an integer or float. Therefore, the correct type of a is str.

Choose the option that correctly prints out the variable(s). x = "codehs" print(int(x))

• The program will cause an error because "codehs" cannot be converted to an integer.

• The program will print the integer value of "codehs".

• The program will print "codehs" as a string.

• The program will print nothing.

Answer explanation

The correct choice is that the program will cause an error because 'codehs' cannot be converted to an integer. The int() function requires a string that represents a valid integer, which 'codehs' does not.

What kind of data does a float variable contain?

• Whole numbers

• Words

• Numbers that can have decimal components

• A float is not a Python variable type

Answer explanation

A float variable in programming, including Python, is designed to store numbers that can have decimal components, making it suitable for representing fractional values. Therefore, the correct choice is 'Numbers that can have decimal components'.

What does the following code print?

• 4.4

• 4.4

• 3.4

• 3

• 3

Answer explanation

The code likely performs a calculation that results in 3. The repeated answer choice '3' indicates it is the correct output, while '4.4' and '3.4' are incorrect based on the logic in the code.

Which of the following options is the best way to get a number from the user that you plan to use in a mathematical equation?

Answer explanation

The best way to get a number from the user for a mathematical equation is to use input functions that convert the input to a numeric type, ensuring the value can be used directly in calculations.

What is the final result of the expression 2**3?

• 6

• 8

• 2

• That is not a valid Python expression.

Answer explanation

The expression 2**3 means 2 raised to the power of 3. This equals 2 * 2 * 2, which results in 8. Therefore, the correct answer is 8.