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Introduction to Python Video Course
Introduction to Python Video Course
User Defined Functions
A user-defined function is a block of code that you create to perform a specific task. Unlike built-in functions, which are provided by Python, user-defined functions are written by you to solve specific problems in your programs. Once defined, these functions can be reused multiple times, making your code more organized, efficient, and easier to maintain.
Now, let's watch as Alex demonstrates how to create and use user-defined functions to simplify tasks:
Syntax: The basic structure of a user-defined function in Python looks like this:
def
: This keyword is used to start the definition of a function;function_name
: This is the name you give to your function. It should be descriptive of what the function does, making your code more readable;parameters
: These are variables that you pass into the function. They act as placeholders for the values that you’ll provide when calling the function. A function can have zero or more parameters;- The colon
:
signifies the start of the function’s code block; - Code block: This is the body of the function, where you write the code that the function will execute. It must be indented;
return
: This statement is used to exit the function and return a result. Not all functions need a return statement, but it’s useful when you want to send a value back to where the function was called;
Parameters and Arguments
Parameters: Parameters are the variables listed inside the parentheses in the function definition. They are used to receive values (arguments) that are passed into the function:
def greet_customer(name): greeting = print(f"Hello, {name}! Welcome to our store.") return greeting
Arguments: Arguments are the actual values you provide to the function when you call it. These values are assigned to the function’s parameters.
greet_customer("Alice")
In this example, "Alice"
is the argument received by the name
parameter in the greet_customer
function.
def greet_customer(name): greeting = print(f"Hello, {name}! Welcome to our store.") return greeting greet_customer("Alice")
Void Functions
Not all functions need to return a value. Some functions perform a task but don’t send anything back to the caller. These are called void
functions. In Python, a void function is a user-defined function that doesn’t include a return
statement or where the return
statement doesn’t return any value (i.e., it returns None
).
In this example, greet_customer
is a void function because it performs the action of printing a greeting but doesn’t return any result that can be stored or used elsewhere in your program:
def greet_customer(name): print(f"Hello, {name}! Welcome to our store.") greet_customer("Alice")
Example Application
User-defined functions can be used to encapsulate repetitive tasks, making your code cleaner and more modular. For instance, if you frequently need to calculate discounts for various products in your store, you can create a function to handle the discount calculation, which you can then reuse whenever needed.
# price and discount are the parameters of the function def apply_discount(price, discount): discounted_price = price * (1 - discount) return discounted_price # Call the apply_discount function and pass in price and discount as arguments price = 100 discount = 0.2 final_price = apply_discount(price, discount) print(f"The final price is ${final_price}")
Tarefa
In this challenge, you will create a simple function to help manage inventory levels in a grocery store. The goal is to calculate the quantity of products that need to be ordered to reach a desired stock level.
Task:
- Define a Function: Use the proper keyword to start the definition of a function and then name the function
restock_quantity
. - Return a Result: Use the proper keyword to
return
the value ofrestock_quantity
. - Call the Function with Arguments: Call the
restock_quanty
function withcurrent_stock
anddesired_stock
as arguments. We will store the results in a variable namedrestock_needed
.
Tarefa
In this challenge, you will create a simple function to help manage inventory levels in a grocery store. The goal is to calculate the quantity of products that need to be ordered to reach a desired stock level.
Task:
- Define a Function: Use the proper keyword to start the definition of a function and then name the function
restock_quantity
. - Return a Result: Use the proper keyword to
return
the value ofrestock_quantity
. - Call the Function with Arguments: Call the
restock_quanty
function withcurrent_stock
anddesired_stock
as arguments. We will store the results in a variable namedrestock_needed
.
index
index
index
Tudo estava claro?
User Defined Functions
A user-defined function is a block of code that you create to perform a specific task. Unlike built-in functions, which are provided by Python, user-defined functions are written by you to solve specific problems in your programs. Once defined, these functions can be reused multiple times, making your code more organized, efficient, and easier to maintain.
Now, let's watch as Alex demonstrates how to create and use user-defined functions to simplify tasks:
Syntax: The basic structure of a user-defined function in Python looks like this:
def
: This keyword is used to start the definition of a function;function_name
: This is the name you give to your function. It should be descriptive of what the function does, making your code more readable;parameters
: These are variables that you pass into the function. They act as placeholders for the values that you’ll provide when calling the function. A function can have zero or more parameters;- The colon
:
signifies the start of the function’s code block; - Code block: This is the body of the function, where you write the code that the function will execute. It must be indented;
return
: This statement is used to exit the function and return a result. Not all functions need a return statement, but it’s useful when you want to send a value back to where the function was called;
Parameters and Arguments
Parameters: Parameters are the variables listed inside the parentheses in the function definition. They are used to receive values (arguments) that are passed into the function:
def greet_customer(name): greeting = print(f"Hello, {name}! Welcome to our store.") return greeting
Arguments: Arguments are the actual values you provide to the function when you call it. These values are assigned to the function’s parameters.
greet_customer("Alice")
In this example, "Alice"
is the argument received by the name
parameter in the greet_customer
function.
def greet_customer(name): greeting = print(f"Hello, {name}! Welcome to our store.") return greeting greet_customer("Alice")
Void Functions
Not all functions need to return a value. Some functions perform a task but don’t send anything back to the caller. These are called void
functions. In Python, a void function is a user-defined function that doesn’t include a return
statement or where the return
statement doesn’t return any value (i.e., it returns None
).
In this example, greet_customer
is a void function because it performs the action of printing a greeting but doesn’t return any result that can be stored or used elsewhere in your program:
def greet_customer(name): print(f"Hello, {name}! Welcome to our store.") greet_customer("Alice")
Example Application
User-defined functions can be used to encapsulate repetitive tasks, making your code cleaner and more modular. For instance, if you frequently need to calculate discounts for various products in your store, you can create a function to handle the discount calculation, which you can then reuse whenever needed.
# price and discount are the parameters of the function def apply_discount(price, discount): discounted_price = price * (1 - discount) return discounted_price # Call the apply_discount function and pass in price and discount as arguments price = 100 discount = 0.2 final_price = apply_discount(price, discount) print(f"The final price is ${final_price}")
Tarefa
In this challenge, you will create a simple function to help manage inventory levels in a grocery store. The goal is to calculate the quantity of products that need to be ordered to reach a desired stock level.
Task:
- Define a Function: Use the proper keyword to start the definition of a function and then name the function
restock_quantity
. - Return a Result: Use the proper keyword to
return
the value ofrestock_quantity
. - Call the Function with Arguments: Call the
restock_quanty
function withcurrent_stock
anddesired_stock
as arguments. We will store the results in a variable namedrestock_needed
.
Tarefa
In this challenge, you will create a simple function to help manage inventory levels in a grocery store. The goal is to calculate the quantity of products that need to be ordered to reach a desired stock level.
Task:
- Define a Function: Use the proper keyword to start the definition of a function and then name the function
restock_quantity
. - Return a Result: Use the proper keyword to
return
the value ofrestock_quantity
. - Call the Function with Arguments: Call the
restock_quanty
function withcurrent_stock
anddesired_stock
as arguments. We will store the results in a variable namedrestock_needed
.
index
index
index
Tudo estava claro?
User Defined Functions
A user-defined function is a block of code that you create to perform a specific task. Unlike built-in functions, which are provided by Python, user-defined functions are written by you to solve specific problems in your programs. Once defined, these functions can be reused multiple times, making your code more organized, efficient, and easier to maintain.
Now, let's watch as Alex demonstrates how to create and use user-defined functions to simplify tasks:
Syntax: The basic structure of a user-defined function in Python looks like this:
def
: This keyword is used to start the definition of a function;function_name
: This is the name you give to your function. It should be descriptive of what the function does, making your code more readable;parameters
: These are variables that you pass into the function. They act as placeholders for the values that you’ll provide when calling the function. A function can have zero or more parameters;- The colon
:
signifies the start of the function’s code block; - Code block: This is the body of the function, where you write the code that the function will execute. It must be indented;
return
: This statement is used to exit the function and return a result. Not all functions need a return statement, but it’s useful when you want to send a value back to where the function was called;
Parameters and Arguments
Parameters: Parameters are the variables listed inside the parentheses in the function definition. They are used to receive values (arguments) that are passed into the function:
def greet_customer(name): greeting = print(f"Hello, {name}! Welcome to our store.") return greeting
Arguments: Arguments are the actual values you provide to the function when you call it. These values are assigned to the function’s parameters.
greet_customer("Alice")
In this example, "Alice"
is the argument received by the name
parameter in the greet_customer
function.
def greet_customer(name): greeting = print(f"Hello, {name}! Welcome to our store.") return greeting greet_customer("Alice")
Void Functions
Not all functions need to return a value. Some functions perform a task but don’t send anything back to the caller. These are called void
functions. In Python, a void function is a user-defined function that doesn’t include a return
statement or where the return
statement doesn’t return any value (i.e., it returns None
).
In this example, greet_customer
is a void function because it performs the action of printing a greeting but doesn’t return any result that can be stored or used elsewhere in your program:
def greet_customer(name): print(f"Hello, {name}! Welcome to our store.") greet_customer("Alice")
Example Application
User-defined functions can be used to encapsulate repetitive tasks, making your code cleaner and more modular. For instance, if you frequently need to calculate discounts for various products in your store, you can create a function to handle the discount calculation, which you can then reuse whenever needed.
# price and discount are the parameters of the function def apply_discount(price, discount): discounted_price = price * (1 - discount) return discounted_price # Call the apply_discount function and pass in price and discount as arguments price = 100 discount = 0.2 final_price = apply_discount(price, discount) print(f"The final price is ${final_price}")
Tarefa
In this challenge, you will create a simple function to help manage inventory levels in a grocery store. The goal is to calculate the quantity of products that need to be ordered to reach a desired stock level.
Task:
- Define a Function: Use the proper keyword to start the definition of a function and then name the function
restock_quantity
. - Return a Result: Use the proper keyword to
return
the value ofrestock_quantity
. - Call the Function with Arguments: Call the
restock_quanty
function withcurrent_stock
anddesired_stock
as arguments. We will store the results in a variable namedrestock_needed
.
Tarefa
In this challenge, you will create a simple function to help manage inventory levels in a grocery store. The goal is to calculate the quantity of products that need to be ordered to reach a desired stock level.
Task:
- Define a Function: Use the proper keyword to start the definition of a function and then name the function
restock_quantity
. - Return a Result: Use the proper keyword to
return
the value ofrestock_quantity
. - Call the Function with Arguments: Call the
restock_quanty
function withcurrent_stock
anddesired_stock
as arguments. We will store the results in a variable namedrestock_needed
.
index
index
index
Tudo estava claro?
A user-defined function is a block of code that you create to perform a specific task. Unlike built-in functions, which are provided by Python, user-defined functions are written by you to solve specific problems in your programs. Once defined, these functions can be reused multiple times, making your code more organized, efficient, and easier to maintain.
Now, let's watch as Alex demonstrates how to create and use user-defined functions to simplify tasks:
Syntax: The basic structure of a user-defined function in Python looks like this:
def
: This keyword is used to start the definition of a function;function_name
: This is the name you give to your function. It should be descriptive of what the function does, making your code more readable;parameters
: These are variables that you pass into the function. They act as placeholders for the values that you’ll provide when calling the function. A function can have zero or more parameters;- The colon
:
signifies the start of the function’s code block; - Code block: This is the body of the function, where you write the code that the function will execute. It must be indented;
return
: This statement is used to exit the function and return a result. Not all functions need a return statement, but it’s useful when you want to send a value back to where the function was called;
Parameters and Arguments
Parameters: Parameters are the variables listed inside the parentheses in the function definition. They are used to receive values (arguments) that are passed into the function:
def greet_customer(name): greeting = print(f"Hello, {name}! Welcome to our store.") return greeting
Arguments: Arguments are the actual values you provide to the function when you call it. These values are assigned to the function’s parameters.
greet_customer("Alice")
In this example, "Alice"
is the argument received by the name
parameter in the greet_customer
function.
def greet_customer(name): greeting = print(f"Hello, {name}! Welcome to our store.") return greeting greet_customer("Alice")
Void Functions
Not all functions need to return a value. Some functions perform a task but don’t send anything back to the caller. These are called void
functions. In Python, a void function is a user-defined function that doesn’t include a return
statement or where the return
statement doesn’t return any value (i.e., it returns None
).
In this example, greet_customer
is a void function because it performs the action of printing a greeting but doesn’t return any result that can be stored or used elsewhere in your program:
def greet_customer(name): print(f"Hello, {name}! Welcome to our store.") greet_customer("Alice")
Example Application
User-defined functions can be used to encapsulate repetitive tasks, making your code cleaner and more modular. For instance, if you frequently need to calculate discounts for various products in your store, you can create a function to handle the discount calculation, which you can then reuse whenever needed.
# price and discount are the parameters of the function def apply_discount(price, discount): discounted_price = price * (1 - discount) return discounted_price # Call the apply_discount function and pass in price and discount as arguments price = 100 discount = 0.2 final_price = apply_discount(price, discount) print(f"The final price is ${final_price}")
Tarefa
In this challenge, you will create a simple function to help manage inventory levels in a grocery store. The goal is to calculate the quantity of products that need to be ordered to reach a desired stock level.
Task:
- Define a Function: Use the proper keyword to start the definition of a function and then name the function
restock_quantity
. - Return a Result: Use the proper keyword to
return
the value ofrestock_quantity
. - Call the Function with Arguments: Call the
restock_quanty
function withcurrent_stock
anddesired_stock
as arguments. We will store the results in a variable namedrestock_needed
.
index
index
index