Contenido del Curso

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

While Loops

while loops are the key tool for handling indefinite iteration, which is useful in scenarios where the number of iterations isn't known in advance, like monitoring inventory levels until they meet a specific threshold.

Watch as Alex demonstrates how to use while loops to handle dynamic situations:

A while loop in Python continuously runs a block of code as long as a specified condition remains True.

Syntax

To start a while loop, you define a counter variable and follow it with the while keyword and a boolean condition. The condition is followed by a colon :, which indicates the start of the loop's code block.

The loop will execute repeatedly until the condition becomes False. Typically, the counter variable is updated inside the loop to eventually make the condition False and stop the loop.

Take this while loop for example:


              1234567891011
            
# Handling a queue at a grocery store checkout
queue_length = 5  # Initial number of people in the queue
while queue_length > 0:  # Start the `while` loop as long as the queue isn't empty
    print(f"Current queue size: {queue_length}")
    
    # Simulate serving a customer
    print("Serving the next customer...")
    
    # Decrease the queue length by 1 as a customer leaves
    # The `-=` operator is a shortcut for `queue_length = queue_length - 1`
    queue_length -= 1

In this example, queue_length acts as our counter variable, starting at 5. With each loop iteration, the value of queue_length decreases by 1 until it reaches 0. At that point, the loop ends because the condition 0 > 0 evaluates to False.

Note
It is crucial to update the counter variable inside the loop to eventually meet the condition for stopping the loop. Without this, the loop will run infinitely, preventing any further code from executing.

Example Application

Imagine you're managing the milk stock in a grocery store. You need to ensure the stock doesn't drop below a certain level, and when it does, you should reorder to maintain the stock level.

A while loop is useful in this situation because it allows you to restock milk in increments over several iterations until the stock reaches the desired level. Without a while loop, you'd need to calculate the exact amount of milk to reorder all at once.

For instance, consider that a store worker can only restock a fixed amount of milk in one trip (e.g., 20 packs per restock). If the stock isn't fully replenished, the worker returns to the warehouse to bring another batch of milk.


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# Initial amount of milk in stock
milk_stock = 15
# Minimum stock level before reordering is necessary
min_stock = 50
# Quantity a worker can restock at one time
reorder_quantity = 20

# Start the loop to restock milk until the stock exceeds the minimum required level
while milk_stock < min_stock:
    # If the loop is running, the condition is `True`, indicating we need more milk
    print(f"Milk stock is low: {milk_stock} units remaining.")
    # Simulate the process of reordering milk
    print("Restocking milk...")
    # Increase the stock by the quantity the worker can bring in one trip
    milk_stock += reorder_quantity
    
# Output the final stock level after restocking is complete
print(f"Milk stock updated: {milk_stock} units, which is now sufficient.")

Note
milk_stock += reorder_quantity is equivalent to milk_stock = milk_stock + reorder_quantity. It's simply a more concise and readable way to express the same operation.

The flowchart above illustrates the logic behind the while loop used for managing the milk inventory. Notice how the counter variable milk_stock, starting at 15, is incremented by the reorder_quantity with each loop iteration.

The loop keeps running until milk_stock surpasses the min_stock threshold of 50, at which point it stops.

Tarea

In this task, you will manage grocery store inventory by using loops to restock products until they meet their minimum stock levels, similar to the previous example.

This time, you will set up loops for three items — Bread, Eggs, and Apples — and update their stock using the restock quantities stored in the dictionary, alongside current stock and minimum stock. After restocking, you will print the updated inventory.

Use a while loop to check if "Bread"'s stock is below the required minimum. If it is, restock by adding the specified restock quantity.
Similarly, use a while loop to check and restock "Eggs" if needed, adding the restock quantity when the stock is below the minimum.
Apply the same logic to restock "Apples" with a while loop.
After all items are restocked, print the final inventory with updated stock levels. Ensure you correctly unpack the dictionary values in the for loop when printing.

Note
The code introduces new ways of formatting strings for better readability:
Inside f-strings, single quotes ' can be used within double-quoted strings. For example: f"Bread stock is low: {inventory['Bread'][0]} units.". The outer string uses double quotes, while 'Bread' uses single quotes to avoid conflicts.
You can insert a new line in the output using the escape sequence \n, like "First line.\nSecond line." which will split the output into two lines.

Tarea

In this task, you will manage grocery store inventory by using loops to restock products until they meet their minimum stock levels, similar to the previous example.

Use a while loop to check if "Bread"'s stock is below the required minimum. If it is, restock by adding the specified restock quantity.
Similarly, use a while loop to check and restock "Eggs" if needed, adding the restock quantity when the stock is below the minimum.
Apply the same logic to restock "Apples" with a while loop.
After all items are restocked, print the final inventory with updated stock levels. Ensure you correctly unpack the dictionary values in the for loop when printing.

Note
The code introduces new ways of formatting strings for better readability:
Inside f-strings, single quotes ' can be used within double-quoted strings. For example: f"Bread stock is low: {inventory['Bread'][0]} units.". The outer string uses double quotes, while 'Bread' uses single quotes to avoid conflicts.
You can insert a new line in the output using the escape sequence \n, like "First line.\nSecond line." which will split the output into two lines.

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones

¿Todo estuvo claro?

Sección 5. Capítulo 2

While Loops

Watch as Alex demonstrates how to use while loops to handle dynamic situations:

A while loop in Python continuously runs a block of code as long as a specified condition remains True.

Syntax

The loop will execute repeatedly until the condition becomes False. Typically, the counter variable is updated inside the loop to eventually make the condition False and stop the loop.

Take this while loop for example:


              1234567891011
            
# Handling a queue at a grocery store checkout
queue_length = 5  # Initial number of people in the queue
while queue_length > 0:  # Start the `while` loop as long as the queue isn't empty
    print(f"Current queue size: {queue_length}")
    
    # Simulate serving a customer
    print("Serving the next customer...")
    
    # Decrease the queue length by 1 as a customer leaves
    # The `-=` operator is a shortcut for `queue_length = queue_length - 1`
    queue_length -= 1

Note
It is crucial to update the counter variable inside the loop to eventually meet the condition for stopping the loop. Without this, the loop will run infinitely, preventing any further code from executing.

Example Application

Imagine you're managing the milk stock in a grocery store. You need to ensure the stock doesn't drop below a certain level, and when it does, you should reorder to maintain the stock level.


              123456789101112131415161718
            
# Initial amount of milk in stock
milk_stock = 15
# Minimum stock level before reordering is necessary
min_stock = 50
# Quantity a worker can restock at one time
reorder_quantity = 20

# Start the loop to restock milk until the stock exceeds the minimum required level
while milk_stock < min_stock:
    # If the loop is running, the condition is `True`, indicating we need more milk
    print(f"Milk stock is low: {milk_stock} units remaining.")
    # Simulate the process of reordering milk
    print("Restocking milk...")
    # Increase the stock by the quantity the worker can bring in one trip
    milk_stock += reorder_quantity
    
# Output the final stock level after restocking is complete
print(f"Milk stock updated: {milk_stock} units, which is now sufficient.")

Note
milk_stock += reorder_quantity is equivalent to milk_stock = milk_stock + reorder_quantity. It's simply a more concise and readable way to express the same operation.

The loop keeps running until milk_stock surpasses the min_stock threshold of 50, at which point it stops.

Tarea

In this task, you will manage grocery store inventory by using loops to restock products until they meet their minimum stock levels, similar to the previous example.

Use a while loop to check if "Bread"'s stock is below the required minimum. If it is, restock by adding the specified restock quantity.
Similarly, use a while loop to check and restock "Eggs" if needed, adding the restock quantity when the stock is below the minimum.
Apply the same logic to restock "Apples" with a while loop.
After all items are restocked, print the final inventory with updated stock levels. Ensure you correctly unpack the dictionary values in the for loop when printing.

Note
The code introduces new ways of formatting strings for better readability:
Inside f-strings, single quotes ' can be used within double-quoted strings. For example: f"Bread stock is low: {inventory['Bread'][0]} units.". The outer string uses double quotes, while 'Bread' uses single quotes to avoid conflicts.
You can insert a new line in the output using the escape sequence \n, like "First line.\nSecond line." which will split the output into two lines.

Tarea

In this task, you will manage grocery store inventory by using loops to restock products until they meet their minimum stock levels, similar to the previous example.

Use a while loop to check if "Bread"'s stock is below the required minimum. If it is, restock by adding the specified restock quantity.
Similarly, use a while loop to check and restock "Eggs" if needed, adding the restock quantity when the stock is below the minimum.
Apply the same logic to restock "Apples" with a while loop.
After all items are restocked, print the final inventory with updated stock levels. Ensure you correctly unpack the dictionary values in the for loop when printing.

Note
The code introduces new ways of formatting strings for better readability:
Inside f-strings, single quotes ' can be used within double-quoted strings. For example: f"Bread stock is low: {inventory['Bread'][0]} units.". The outer string uses double quotes, while 'Bread' uses single quotes to avoid conflicts.
You can insert a new line in the output using the escape sequence \n, like "First line.\nSecond line." which will split the output into two lines.

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones

¿Todo estuvo claro?

Sección 5. Capítulo 2

While Loops

Watch as Alex demonstrates how to use while loops to handle dynamic situations:

A while loop in Python continuously runs a block of code as long as a specified condition remains True.

Syntax

The loop will execute repeatedly until the condition becomes False. Typically, the counter variable is updated inside the loop to eventually make the condition False and stop the loop.

Take this while loop for example:


              1234567891011
            
# Handling a queue at a grocery store checkout
queue_length = 5  # Initial number of people in the queue
while queue_length > 0:  # Start the `while` loop as long as the queue isn't empty
    print(f"Current queue size: {queue_length}")
    
    # Simulate serving a customer
    print("Serving the next customer...")
    
    # Decrease the queue length by 1 as a customer leaves
    # The `-=` operator is a shortcut for `queue_length = queue_length - 1`
    queue_length -= 1

Note
It is crucial to update the counter variable inside the loop to eventually meet the condition for stopping the loop. Without this, the loop will run infinitely, preventing any further code from executing.

Example Application

Imagine you're managing the milk stock in a grocery store. You need to ensure the stock doesn't drop below a certain level, and when it does, you should reorder to maintain the stock level.


              123456789101112131415161718
            
# Initial amount of milk in stock
milk_stock = 15
# Minimum stock level before reordering is necessary
min_stock = 50
# Quantity a worker can restock at one time
reorder_quantity = 20

# Start the loop to restock milk until the stock exceeds the minimum required level
while milk_stock < min_stock:
    # If the loop is running, the condition is `True`, indicating we need more milk
    print(f"Milk stock is low: {milk_stock} units remaining.")
    # Simulate the process of reordering milk
    print("Restocking milk...")
    # Increase the stock by the quantity the worker can bring in one trip
    milk_stock += reorder_quantity
    
# Output the final stock level after restocking is complete
print(f"Milk stock updated: {milk_stock} units, which is now sufficient.")

Note
milk_stock += reorder_quantity is equivalent to milk_stock = milk_stock + reorder_quantity. It's simply a more concise and readable way to express the same operation.

The loop keeps running until milk_stock surpasses the min_stock threshold of 50, at which point it stops.

Tarea

In this task, you will manage grocery store inventory by using loops to restock products until they meet their minimum stock levels, similar to the previous example.

Use a while loop to check if "Bread"'s stock is below the required minimum. If it is, restock by adding the specified restock quantity.
Similarly, use a while loop to check and restock "Eggs" if needed, adding the restock quantity when the stock is below the minimum.
Apply the same logic to restock "Apples" with a while loop.
After all items are restocked, print the final inventory with updated stock levels. Ensure you correctly unpack the dictionary values in the for loop when printing.

Note
The code introduces new ways of formatting strings for better readability:
Inside f-strings, single quotes ' can be used within double-quoted strings. For example: f"Bread stock is low: {inventory['Bread'][0]} units.". The outer string uses double quotes, while 'Bread' uses single quotes to avoid conflicts.
You can insert a new line in the output using the escape sequence \n, like "First line.\nSecond line." which will split the output into two lines.

Tarea

In this task, you will manage grocery store inventory by using loops to restock products until they meet their minimum stock levels, similar to the previous example.

Use a while loop to check if "Bread"'s stock is below the required minimum. If it is, restock by adding the specified restock quantity.
Similarly, use a while loop to check and restock "Eggs" if needed, adding the restock quantity when the stock is below the minimum.
Apply the same logic to restock "Apples" with a while loop.
After all items are restocked, print the final inventory with updated stock levels. Ensure you correctly unpack the dictionary values in the for loop when printing.

Note
The code introduces new ways of formatting strings for better readability:
Inside f-strings, single quotes ' can be used within double-quoted strings. For example: f"Bread stock is low: {inventory['Bread'][0]} units.". The outer string uses double quotes, while 'Bread' uses single quotes to avoid conflicts.
You can insert a new line in the output using the escape sequence \n, like "First line.\nSecond line." which will split the output into two lines.

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones

¿Todo estuvo claro?

Watch as Alex demonstrates how to use while loops to handle dynamic situations:

A while loop in Python continuously runs a block of code as long as a specified condition remains True.

Syntax

The loop will execute repeatedly until the condition becomes False. Typically, the counter variable is updated inside the loop to eventually make the condition False and stop the loop.

Take this while loop for example:


              1234567891011
            
# Handling a queue at a grocery store checkout
queue_length = 5  # Initial number of people in the queue
while queue_length > 0:  # Start the `while` loop as long as the queue isn't empty
    print(f"Current queue size: {queue_length}")
    
    # Simulate serving a customer
    print("Serving the next customer...")
    
    # Decrease the queue length by 1 as a customer leaves
    # The `-=` operator is a shortcut for `queue_length = queue_length - 1`
    queue_length -= 1

Note
It is crucial to update the counter variable inside the loop to eventually meet the condition for stopping the loop. Without this, the loop will run infinitely, preventing any further code from executing.

Example Application

Imagine you're managing the milk stock in a grocery store. You need to ensure the stock doesn't drop below a certain level, and when it does, you should reorder to maintain the stock level.


              123456789101112131415161718
            
# Initial amount of milk in stock
milk_stock = 15
# Minimum stock level before reordering is necessary
min_stock = 50
# Quantity a worker can restock at one time
reorder_quantity = 20

# Start the loop to restock milk until the stock exceeds the minimum required level
while milk_stock < min_stock:
    # If the loop is running, the condition is `True`, indicating we need more milk
    print(f"Milk stock is low: {milk_stock} units remaining.")
    # Simulate the process of reordering milk
    print("Restocking milk...")
    # Increase the stock by the quantity the worker can bring in one trip
    milk_stock += reorder_quantity
    
# Output the final stock level after restocking is complete
print(f"Milk stock updated: {milk_stock} units, which is now sufficient.")

Note
milk_stock += reorder_quantity is equivalent to milk_stock = milk_stock + reorder_quantity. It's simply a more concise and readable way to express the same operation.

The loop keeps running until milk_stock surpasses the min_stock threshold of 50, at which point it stops.

Tarea

In this task, you will manage grocery store inventory by using loops to restock products until they meet their minimum stock levels, similar to the previous example.

Use a while loop to check if "Bread"'s stock is below the required minimum. If it is, restock by adding the specified restock quantity.
Similarly, use a while loop to check and restock "Eggs" if needed, adding the restock quantity when the stock is below the minimum.
Apply the same logic to restock "Apples" with a while loop.
After all items are restocked, print the final inventory with updated stock levels. Ensure you correctly unpack the dictionary values in the for loop when printing.

Note
The code introduces new ways of formatting strings for better readability:
Inside f-strings, single quotes ' can be used within double-quoted strings. For example: f"Bread stock is low: {inventory['Bread'][0]} units.". The outer string uses double quotes, while 'Bread' uses single quotes to avoid conflicts.
You can insert a new line in the output using the escape sequence \n, like "First line.\nSecond line." which will split the output into two lines.

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones

Sección 5. Capítulo 2

Cambia al escritorio para practicar en el mundo realContinúe desde donde se encuentra utilizando una de las siguientes opciones