Python For Loops

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Questions and Answers

What is the index value in a for loop?

i

What does range(4) contain?

4 values

What does the keyword in do in a for loop?

It tells the for loop to use the index value (i) to count the values in the range.

How many times will "Hello!" be printed with the following code?

for i in range(4):
  print("Hello!")

<p>4 times</p> Signup and view all the answers

What will the following code print?

for i in range(4):
  print(i)

<p>0 1 2 3</p> Signup and view all the answers

The range function always starts at 0.

<p>False (B)</p> Signup and view all the answers

If we change the range(4) function in the following code to range(1, 4), what will the code print?

for i in range(1, 4):
  print("Hello!")

<p>Hello! Hello! Hello!</p> Signup and view all the answers

What will the following code print?

for i in range(1, 6):
    print(i)

<p>1 2 3 4 5</p> Signup and view all the answers

What will the following code print?

my_number = 4
for i in range(my_number):
    print(i)

<p>0 1 2 3</p> Signup and view all the answers

What will the following code print given the user enters "5"?

my_number = int(input("Number: "))
for i in range(my_number):
    print(i)

<p>0 1 2 3 4</p> Signup and view all the answers

Flashcards

For Loop

A programming construct that repeats a block of code a specific number of times.

Loop Counter (Index)

A variable used to track the current iteration of a for loop.

Range Function

A function that generates a sequence of numbers, typically used in for loops.

In Statement

A statement in a for loop that instructs it to use the loop counter to iterate through the values generated by the range function.

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Basic For Loop

A type of for loop that utilizes the range function to repeat a specific number of times. The starting point for the range is 0, and the loop continues until it reaches the specified number (excluding the last number).

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Zero-Based Counting

The process of starting the count at 0 and incrementing by 1 for each iteration in a for loop.

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Range Function with Start Value

The ability to specify a starting point other than 0 when using the range function. It allows for loops to start iterating from a specific number.

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Range Function with Step

The ability to specify a step size other than 1 within the range function.

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Exponent Function (e.g., **)

A function that calculates the value of a number raised to a specific power.

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For Loop with Variable Range

Creating a for loop that iterates based on the value of a variable that can be changed, providing flexibility in controlling the loop's behavior.

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Nested For Loops

A programming construct that repeats a block of code a specific number of times, often used for iteration, but can be nested to create more complex structures.

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Taking Integer Input

A process that allows a user to input data into a program.

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Decomposition

A technique used to break down a complex problem into smaller, more manageable parts, making it easier to solve.

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Composition

The process of combining smaller, solved parts into a larger, complete solution.

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If-Else Statements

A programming construct that allows code to be executed based on the truth of a certain condition.

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Arrays

A way to represent data or values as a series of consecutive elements.

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Element Access

The process of selecting specific items or values from an array based on their position or index.

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Characters

A data type that represents a single character, often enclosed in single quotes.

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String Conversion

A method used to convert a numerical value into its equivalent text representation.

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Length Function (e.g., len())

A function that returns the total number of items in an array or other collection.

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Study Notes

For Loops

  • For loops are a fundamental programming construct.
  • They allow you to repeat a block of code a specific number of times.
  • A basic for loop iterates over a sequence of values.
  • range(4) creates a sequence of numbers from 0 to 3 (up to, but not including 4).
  • for i in range(4): means the code inside is executed four times with i holding the value from the sequence 0 to 3
  • The code block following for must be indented.
  • range(start, stop, step) can create sequences with different starting numbers, stops, and steps.
  • Providing range(1, 6) creates the sequence of numbers 1 to 5 inclusive
  • range(1, 6, 2) creates sequence of numbers 1,3,5
  • range values can be assigned to variables in order to use them in the loop

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