Course Content

Introduction to Python Video Course

1. Getting Started

First Steps Comments Simple Math Operations Grocery Calculation Capstone Recap

2. Variables and Types

Data Types Storing Data in Variables Variable Naming Rules Using Variables String Indexing and Length String Slicing and Concatenation Inventory Sorting Capstone Challenge Recap

3. Conditional Statements

Boolean Data Type Combining Conditions Challenge Membership Operators and Type Comparisons Conditional Expressions Capstone Challenge Recap

4. Other Data Types

Lists and List Methods Nested Lists Challenge Tuples and Tuple Methods Tuple Operations Challenge Dictionaries and Dictionary Methods Capstone Challenge Recap

5. Loops

For Loops While Loops Range Function Iterating Over Indexes Challenge Nested Loops Capstone Challenge Challenge Recap

6. Functions

Built-in Functions User Defined Functions Challenge Functions with no `return`Modifying Functions Capstone Challenge Recap

Range Function

The range() function in Python is a built-in function that generates a sequence of numbers.

It is often used for iterating over a sequence with loops, particularly when you need to execute a loop a specific number of times.

This is ideal for handling tasks that involve a predictable repetition pattern, such as restocking shelves or scheduling sales in a grocery store setting.

Let's see how Alex utilizes the range() function to manage routine tasks in our grocery store scenario efficiently:

Syntax and Arguments

The range() function can take up to three arguments, making it versatile for various looping scenarios.

Here is the general syntax for the range function:

start: this is the first number of the sequence. It's optional, and if you don't include it, the sequence will start at 0.
stop: this is the last number of the sequence, but the sequence will stop just before this number. This argument is required.
step: this is the amount you add (or subtract) between each number in the sequence. It's optional, and if you don't include it, the sequence will increase by 1 each time.

Now that you have a grasp of the range() function syntax, let’s explore some examples to see how each argument — start, stop, and step — influences the behavior of loops.

A Single Argument

When the range() function is given a single argument, it treats this as the stop parameter.

In our example, it generates a sequence of 7 elements starting from 0 and ending at 6. The loop iterates over these elements, representing the first 7 days the store is open.


              123
            
# Announce store opening every day for 7 days
for day in range(7):
    print(f"Good morning! The store is now open on day {day}.")

Note
The sequence starts at 0 and ends at 6. This happens because Python often starts counting from 0, which reduces the need to adjust indexing in many situations.

Two Arguments

When two arguments are provided, like 25 (start) and 32 (stop), range() generates a sequence from 25 to 31 (since the stop value is excluded from the sequence).


              123
            
# Planning seasonal sale days in the last week of December
for day in range(25, 32):
    print(f"Seasonal sale on December {day}.")

Note
With this method of indexing, where the end element is excluded, you can easily calculate the number of elements in the sequence by subtracting the start argument from the stop argument. For example, 32 - 25 = 7, meaning there are 7 elements in the sequence.

Three Arguments

By adding a third argument to range(), you introduce a step value, which defines the increment between each number in the sequence.

In this example, range() takes 1 (start), 13 (stop), and 3 (step), producing the numbers 1, 4, 7, 10. These can represent the starting hours of staff shifts during a 12-hour workday.


              123
            
# Schedule staff shifts every three hours throughout a 12-hour day
for hour in range(1, 13, 3):
    print(f"Staff shift starts at hour {hour}.")

Example Application

With the range() function, we can schedule tasks for each day of the week to make sure all sections of the store are covered.

This loop runs 7 times because range(7) creates numbers from 0 to 6 (a total of 7 elements). In each loop, the variable day takes a value from 0 to 6, which is then used to access elements from both weekly_tasks and weekdays lists.


              123456789101112131415161718192021
            
# List of daily tasks for a week
weekly_tasks = [
    "Restock Fruits",
    "Clean Dairy Section",
    "Review Meat Inventory",
    "Restock Vegetables",
    "Check Bakery Expiry Dates",
    "Organize Front Displays",
    "Prepare Weekly Sales Report"
]

# List of weekdays corresponding to each task
weekdays = [
    "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"
]

# Loop through each day using the range function
for day in range(7):
    task = weekly_tasks[day]  # Access the task corresponding to the current day
    weekday = weekdays[day]   # Access the corresponding weekday
    print(f"{weekday} Task: {task}")

Task

In this task, you are given two lists: one containing products that are on promotion each day, and another containing the names of weekdays. Your goal is to write a loop that iterates over both lists using the range() function. For each iteration, you will print out the current weekday along with the corresponding promotion.

Use a for loop to iterate through the list of promotions and weekdays. You will need to set up the loop to go over the indices of the lists.
Inside the loop, retrieve the correct weekday from the weekdays list using the index day, and retrieve the corresponding promotion from the daily_promotions list.

Note
Pay attention to the number of items in the lists.

Task

Use a for loop to iterate through the list of promotions and weekdays. You will need to set up the loop to go over the indices of the lists.
Inside the loop, retrieve the correct weekday from the weekdays list using the index day, and retrieve the corresponding promotion from the daily_promotions list.

Note
Pay attention to the number of items in the lists.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 5. Chapter 3

Range Function

The range() function in Python is a built-in function that generates a sequence of numbers.

It is often used for iterating over a sequence with loops, particularly when you need to execute a loop a specific number of times.

This is ideal for handling tasks that involve a predictable repetition pattern, such as restocking shelves or scheduling sales in a grocery store setting.

Let's see how Alex utilizes the range() function to manage routine tasks in our grocery store scenario efficiently:

Syntax and Arguments

The range() function can take up to three arguments, making it versatile for various looping scenarios.

Here is the general syntax for the range function:

start: this is the first number of the sequence. It's optional, and if you don't include it, the sequence will start at 0.
stop: this is the last number of the sequence, but the sequence will stop just before this number. This argument is required.
step: this is the amount you add (or subtract) between each number in the sequence. It's optional, and if you don't include it, the sequence will increase by 1 each time.

Now that you have a grasp of the range() function syntax, let’s explore some examples to see how each argument — start, stop, and step — influences the behavior of loops.

A Single Argument

When the range() function is given a single argument, it treats this as the stop parameter.

In our example, it generates a sequence of 7 elements starting from 0 and ending at 6. The loop iterates over these elements, representing the first 7 days the store is open.


              123
            
# Announce store opening every day for 7 days
for day in range(7):
    print(f"Good morning! The store is now open on day {day}.")

Note
The sequence starts at 0 and ends at 6. This happens because Python often starts counting from 0, which reduces the need to adjust indexing in many situations.

Two Arguments

When two arguments are provided, like 25 (start) and 32 (stop), range() generates a sequence from 25 to 31 (since the stop value is excluded from the sequence).


              123
            
# Planning seasonal sale days in the last week of December
for day in range(25, 32):
    print(f"Seasonal sale on December {day}.")

Note
With this method of indexing, where the end element is excluded, you can easily calculate the number of elements in the sequence by subtracting the start argument from the stop argument. For example, 32 - 25 = 7, meaning there are 7 elements in the sequence.

Three Arguments

By adding a third argument to range(), you introduce a step value, which defines the increment between each number in the sequence.


              123
            
# Schedule staff shifts every three hours throughout a 12-hour day
for hour in range(1, 13, 3):
    print(f"Staff shift starts at hour {hour}.")

Example Application

With the range() function, we can schedule tasks for each day of the week to make sure all sections of the store are covered.


              123456789101112131415161718192021
            
# List of daily tasks for a week
weekly_tasks = [
    "Restock Fruits",
    "Clean Dairy Section",
    "Review Meat Inventory",
    "Restock Vegetables",
    "Check Bakery Expiry Dates",
    "Organize Front Displays",
    "Prepare Weekly Sales Report"
]

# List of weekdays corresponding to each task
weekdays = [
    "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"
]

# Loop through each day using the range function
for day in range(7):
    task = weekly_tasks[day]  # Access the task corresponding to the current day
    weekday = weekdays[day]   # Access the corresponding weekday
    print(f"{weekday} Task: {task}")

Task

Use a for loop to iterate through the list of promotions and weekdays. You will need to set up the loop to go over the indices of the lists.
Inside the loop, retrieve the correct weekday from the weekdays list using the index day, and retrieve the corresponding promotion from the daily_promotions list.

Note
Pay attention to the number of items in the lists.

Task

Use a for loop to iterate through the list of promotions and weekdays. You will need to set up the loop to go over the indices of the lists.
Inside the loop, retrieve the correct weekday from the weekdays list using the index day, and retrieve the corresponding promotion from the daily_promotions list.

Note
Pay attention to the number of items in the lists.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Section 5. Chapter 3

Range Function

The range() function in Python is a built-in function that generates a sequence of numbers.

It is often used for iterating over a sequence with loops, particularly when you need to execute a loop a specific number of times.

This is ideal for handling tasks that involve a predictable repetition pattern, such as restocking shelves or scheduling sales in a grocery store setting.

Let's see how Alex utilizes the range() function to manage routine tasks in our grocery store scenario efficiently:

Syntax and Arguments

The range() function can take up to three arguments, making it versatile for various looping scenarios.

Here is the general syntax for the range function:

start: this is the first number of the sequence. It's optional, and if you don't include it, the sequence will start at 0.
stop: this is the last number of the sequence, but the sequence will stop just before this number. This argument is required.
step: this is the amount you add (or subtract) between each number in the sequence. It's optional, and if you don't include it, the sequence will increase by 1 each time.

Now that you have a grasp of the range() function syntax, let’s explore some examples to see how each argument — start, stop, and step — influences the behavior of loops.

A Single Argument

When the range() function is given a single argument, it treats this as the stop parameter.

In our example, it generates a sequence of 7 elements starting from 0 and ending at 6. The loop iterates over these elements, representing the first 7 days the store is open.


              123
            
# Announce store opening every day for 7 days
for day in range(7):
    print(f"Good morning! The store is now open on day {day}.")

Note
The sequence starts at 0 and ends at 6. This happens because Python often starts counting from 0, which reduces the need to adjust indexing in many situations.

Two Arguments

When two arguments are provided, like 25 (start) and 32 (stop), range() generates a sequence from 25 to 31 (since the stop value is excluded from the sequence).


              123
            
# Planning seasonal sale days in the last week of December
for day in range(25, 32):
    print(f"Seasonal sale on December {day}.")

Note
With this method of indexing, where the end element is excluded, you can easily calculate the number of elements in the sequence by subtracting the start argument from the stop argument. For example, 32 - 25 = 7, meaning there are 7 elements in the sequence.

Three Arguments

By adding a third argument to range(), you introduce a step value, which defines the increment between each number in the sequence.


              123
            
# Schedule staff shifts every three hours throughout a 12-hour day
for hour in range(1, 13, 3):
    print(f"Staff shift starts at hour {hour}.")

Example Application

With the range() function, we can schedule tasks for each day of the week to make sure all sections of the store are covered.


              123456789101112131415161718192021
            
# List of daily tasks for a week
weekly_tasks = [
    "Restock Fruits",
    "Clean Dairy Section",
    "Review Meat Inventory",
    "Restock Vegetables",
    "Check Bakery Expiry Dates",
    "Organize Front Displays",
    "Prepare Weekly Sales Report"
]

# List of weekdays corresponding to each task
weekdays = [
    "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"
]

# Loop through each day using the range function
for day in range(7):
    task = weekly_tasks[day]  # Access the task corresponding to the current day
    weekday = weekdays[day]   # Access the corresponding weekday
    print(f"{weekday} Task: {task}")

Task

Use a for loop to iterate through the list of promotions and weekdays. You will need to set up the loop to go over the indices of the lists.
Inside the loop, retrieve the correct weekday from the weekdays list using the index day, and retrieve the corresponding promotion from the daily_promotions list.

Note
Pay attention to the number of items in the lists.

Task

Use a for loop to iterate through the list of promotions and weekdays. You will need to set up the loop to go over the indices of the lists.
Inside the loop, retrieve the correct weekday from the weekdays list using the index day, and retrieve the corresponding promotion from the daily_promotions list.

Note
Pay attention to the number of items in the lists.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

The range() function in Python is a built-in function that generates a sequence of numbers.

It is often used for iterating over a sequence with loops, particularly when you need to execute a loop a specific number of times.

This is ideal for handling tasks that involve a predictable repetition pattern, such as restocking shelves or scheduling sales in a grocery store setting.

Let's see how Alex utilizes the range() function to manage routine tasks in our grocery store scenario efficiently:

Syntax and Arguments

The range() function can take up to three arguments, making it versatile for various looping scenarios.

Here is the general syntax for the range function:

start: this is the first number of the sequence. It's optional, and if you don't include it, the sequence will start at 0.
stop: this is the last number of the sequence, but the sequence will stop just before this number. This argument is required.
step: this is the amount you add (or subtract) between each number in the sequence. It's optional, and if you don't include it, the sequence will increase by 1 each time.

Now that you have a grasp of the range() function syntax, let’s explore some examples to see how each argument — start, stop, and step — influences the behavior of loops.

A Single Argument

When the range() function is given a single argument, it treats this as the stop parameter.

In our example, it generates a sequence of 7 elements starting from 0 and ending at 6. The loop iterates over these elements, representing the first 7 days the store is open.


              123
            
# Announce store opening every day for 7 days
for day in range(7):
    print(f"Good morning! The store is now open on day {day}.")

Note
The sequence starts at 0 and ends at 6. This happens because Python often starts counting from 0, which reduces the need to adjust indexing in many situations.

Two Arguments

When two arguments are provided, like 25 (start) and 32 (stop), range() generates a sequence from 25 to 31 (since the stop value is excluded from the sequence).


              123
            
# Planning seasonal sale days in the last week of December
for day in range(25, 32):
    print(f"Seasonal sale on December {day}.")

Note
With this method of indexing, where the end element is excluded, you can easily calculate the number of elements in the sequence by subtracting the start argument from the stop argument. For example, 32 - 25 = 7, meaning there are 7 elements in the sequence.

Three Arguments

By adding a third argument to range(), you introduce a step value, which defines the increment between each number in the sequence.


              123
            
# Schedule staff shifts every three hours throughout a 12-hour day
for hour in range(1, 13, 3):
    print(f"Staff shift starts at hour {hour}.")

Example Application

With the range() function, we can schedule tasks for each day of the week to make sure all sections of the store are covered.


              123456789101112131415161718192021
            
# List of daily tasks for a week
weekly_tasks = [
    "Restock Fruits",
    "Clean Dairy Section",
    "Review Meat Inventory",
    "Restock Vegetables",
    "Check Bakery Expiry Dates",
    "Organize Front Displays",
    "Prepare Weekly Sales Report"
]

# List of weekdays corresponding to each task
weekdays = [
    "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"
]

# Loop through each day using the range function
for day in range(7):
    task = weekly_tasks[day]  # Access the task corresponding to the current day
    weekday = weekdays[day]   # Access the corresponding weekday
    print(f"{weekday} Task: {task}")

Task

Use a for loop to iterate through the list of promotions and weekdays. You will need to set up the loop to go over the indices of the lists.
Inside the loop, retrieve the correct weekday from the weekdays list using the index day, and retrieve the corresponding promotion from the daily_promotions list.

Note
Pay attention to the number of items in the lists.

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Section 5. Chapter 3

Switch to desktop for real-world practiceContinue from where you are using one of the options below