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Python Functions Tutorial
course content

Course Content

Python Functions Tutorial

Python Functions Tutorial

1. What is Function in Python?
What Is Function?Challenge: Building functionsArgumentsReturn ValueFunction BodyBuilt-in Functions
2. Positional and Optional Arguments
Positional ArgumentsChallenge: Positional ArgumentsOptional ArgumentsChallenge: Optional Arguments
3. Arbitrary Arguments
Arbitrary ArgumentsArbitrary Keyword ArgumentsCombination of Positional and Optional Arguments
4. Function Return Value Specification
Single Return ValueMultiple Return ValuesNone Return ValueGenerator FunctionsChallenge: Traffic lights
5. Recursion and Lambda Functions
RecursionChallenge: PyramidLambda FunctionsImmediately Invoked Lambda ExpressionWriting Effective and Maintainable Functions

bookImmediately Invoked Lambda Expression

The immediate invocation of a lambda function (IIFE) can serve several purposes:

  1. Variable Locality: The lambda function is invoked immediately, and any variables defined within it exist only within the scope of that function. This helps avoid naming conflicts with other parts of the code;
  2. Code Isolation: An IIFE allows you to isolate a portion of code by encapsulating it within a function. This is particularly useful when you need to define temporary variables or scopes for a specific code fragment, avoiding impact on the rest of the program;
  3. Global Namespace Protection: Using an IIFE helps prevent additional pollution of the global namespace, as it is only used where it is declared.

              
12

            
square = (lambda x: x**2)(5)
print(square)
copy

Let's break down each part of this expression:

  1. (lambda x: x**2): This is the lambda function, created to calculate the square of a number;
  2. (5): In this case, the lambda function is called with the argument 5.

Task

Edit a lambda function for converting temperature from degrees Celsius to degrees Fahrenheit. The conversion formula looks like this:

F = 5/9C + 32
  • Celsius temperature is stored in the celsius_temperature variable.
  • The fahrenheit temperature should be saved before changing fahrenheit_temperature.

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Section 5. Chapter 4
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bookImmediately Invoked Lambda Expression

The immediate invocation of a lambda function (IIFE) can serve several purposes:

  1. Variable Locality: The lambda function is invoked immediately, and any variables defined within it exist only within the scope of that function. This helps avoid naming conflicts with other parts of the code;
  2. Code Isolation: An IIFE allows you to isolate a portion of code by encapsulating it within a function. This is particularly useful when you need to define temporary variables or scopes for a specific code fragment, avoiding impact on the rest of the program;
  3. Global Namespace Protection: Using an IIFE helps prevent additional pollution of the global namespace, as it is only used where it is declared.

              
12

            
square = (lambda x: x**2)(5)
print(square)
copy

Let's break down each part of this expression:

  1. (lambda x: x**2): This is the lambda function, created to calculate the square of a number;
  2. (5): In this case, the lambda function is called with the argument 5.

Task

Edit a lambda function for converting temperature from degrees Celsius to degrees Fahrenheit. The conversion formula looks like this:

F = 5/9C + 32
  • Celsius temperature is stored in the celsius_temperature variable.
  • The fahrenheit temperature should be saved before changing fahrenheit_temperature.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 5. Chapter 4
toggle bottom row

bookImmediately Invoked Lambda Expression

The immediate invocation of a lambda function (IIFE) can serve several purposes:

  1. Variable Locality: The lambda function is invoked immediately, and any variables defined within it exist only within the scope of that function. This helps avoid naming conflicts with other parts of the code;
  2. Code Isolation: An IIFE allows you to isolate a portion of code by encapsulating it within a function. This is particularly useful when you need to define temporary variables or scopes for a specific code fragment, avoiding impact on the rest of the program;
  3. Global Namespace Protection: Using an IIFE helps prevent additional pollution of the global namespace, as it is only used where it is declared.

              
12

            
square = (lambda x: x**2)(5)
print(square)
copy

Let's break down each part of this expression:

  1. (lambda x: x**2): This is the lambda function, created to calculate the square of a number;
  2. (5): In this case, the lambda function is called with the argument 5.

Task

Edit a lambda function for converting temperature from degrees Celsius to degrees Fahrenheit. The conversion formula looks like this:

F = 5/9C + 32
  • Celsius temperature is stored in the celsius_temperature variable.
  • The fahrenheit temperature should be saved before changing fahrenheit_temperature.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

The immediate invocation of a lambda function (IIFE) can serve several purposes:

  1. Variable Locality: The lambda function is invoked immediately, and any variables defined within it exist only within the scope of that function. This helps avoid naming conflicts with other parts of the code;
  2. Code Isolation: An IIFE allows you to isolate a portion of code by encapsulating it within a function. This is particularly useful when you need to define temporary variables or scopes for a specific code fragment, avoiding impact on the rest of the program;
  3. Global Namespace Protection: Using an IIFE helps prevent additional pollution of the global namespace, as it is only used where it is declared.

              
12

            
square = (lambda x: x**2)(5)
print(square)
copy

Let's break down each part of this expression:

  1. (lambda x: x**2): This is the lambda function, created to calculate the square of a number;
  2. (5): In this case, the lambda function is called with the argument 5.

Task

Edit a lambda function for converting temperature from degrees Celsius to degrees Fahrenheit. The conversion formula looks like this:

F = 5/9C + 32
  • Celsius temperature is stored in the celsius_temperature variable.
  • The fahrenheit temperature should be saved before changing fahrenheit_temperature.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 5. Chapter 4
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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