Python Data Types and Variables

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Questions and Answers

What will the types of the variables x, y and z be after executing the following code, assuming the user enters 6?

x = input("Enter a number: ") y = int(x) z = y / 2

  • x - int, y - int, z - int
  • x - str, y - int, z - float (correct)
  • x - int, y - int, z - float
  • types different from the other answers
  • x - str, y - int, z - int

Which of the following statements is FALSE about while loops?

  • Any while loop can be rewritten as an equivalent for loop. (correct)
  • Some while loops can loop forever.
  • Any while loop containing a break statement can be rewritten as an equivalent while loop without a break statement.
  • Some while loops can exit without their body being executed at all.
  • Any for loop can be written as an equivalent while loop.

What will happen if we make the call years_to_become_millionaire(0) to the following function?

def years_to_become_millionaire(amount): interest_rate = 0.055 year = 0 while amount < 1000000: amount = amount * (1 + interest_rate) year = year + 1 return year

  • The while loop will never exit and the function will return 0.
  • The function will give an error.
  • The while loop will never exit and the function will return Infinity. (correct)
  • The while loop will loop forever and the function will never return anything.
  • The while loop will exit straight away and the function will return 0.

Flashcards

string

A sequence of characters, often used to represent text or data.

integer

A data type typically representing whole numbers without a fractional part.

float

A data type that can represent numbers with decimal parts.

input() function

In Python, input() takes user input and returns it as a string.

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int() function

In Python, the int() function attempts to convert a string to an integer.

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while loop

A loop that repeats as long as a given condition is true. Code within the loop is executed repeatedly until the condition becomes false.

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while loop condition

The condition in a while loop that is evaluated to determine whether to continue executing the loop.

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break statement

A statement that abruptly exits a loop, regardless of the loop condition.

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for loop

A loop based on explicitly iterating through a sequence of items (e.g., a list), executing the loop body once for each item in the sequence.

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infinite loop

A loop that runs indefinitely, without any condition to stop it. It usually requires an external factor (like a break statement or user interaction) to interrupt it.

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continue statement

A statement that stops executing the current iteration of a loop, but continues immediately with the next iteration if there is one.

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function

A set of code that performs a specific task and can be called or invoked repeatedly.

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return value

The value that a function produces and returns to the point where it was invoked.

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function call

The process of executing function code. This involves running the code inside the function and potentially using the returned value.

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parameter

A parameter is a variable that is passed to a function when it is called. These variables are then used within the function to carry out its operations.

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exponent

A type of mathematical expression that involves multiplying a number by itself a specified number of times.

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compound interest

An operation that calculates the result of repeatedly increasing a value by a fixed percentage. It's commonly used to model compound interest growth.

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interest rate

The rate at which an investment grows each period (e.g., annually, monthly). Usually expressed as a percentage.

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amount

A variable that holds the amount of money invested or borrowed.

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year

The number of years that an investment is held or borrowed.

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counter variable

A variable that increments the value of another variable by a certain step during each iteration of a loop. It is often used to track the number of iterations.

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loop condition

A condition that is evaluated at the beginning of each iteration of a loop to determine whether the loop should continue executing.

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Study Notes

Question 1 Summary

  • The variable x is assigned input from the user
  • Variable y is assigned to the integer value of x
  • Variable z is assigned to the integer value of y divided by 2
  • The type of x will be string (str) because it is initially assigned string input
  • The type of y will be integer (int) because int(x) convert x to an integer
  • The type of z will be integer (int) as the result of y divided by a integer is an integer
  • The correct answer is x - str, y - int, z - int

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