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Lære Immediately Invoked Lambda Expression | Recursion and Lambda Functions
Python Functions Tutorial
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Python Functions Tutorial

Python Functions Tutorial

1. What is a Function in Python?
2. Positional and Optional Arguments
3. Arbitrary Arguments
4. Function Return Value Specification
5. Recursion and Lambda Functions

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Immediately Invoked Lambda Expression

The immediate invocation of a lambda function (IIFE) serves 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)
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This expression consists of a lambda function (lambda x: x**2) designed to calculate the square of a number, and it is immediately invoked with the argument (5).

Opgave

Swipe to start coding

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

F = 5/9C + 32
  1. Define a lambda expression using lambda keyword.
  2. Specify that the lambda takes one parameter (celsius).
  3. Calculate Fahrenheit using the given formula.
  4. Set the Celsius temperature (celsius_temperature) in the second parentheses.

Løsning

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Sektion 5. Kapitel 4
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book
Immediately Invoked Lambda Expression

The immediate invocation of a lambda function (IIFE) serves 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

This expression consists of a lambda function (lambda x: x**2) designed to calculate the square of a number, and it is immediately invoked with the argument (5).

Opgave

Swipe to start coding

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

F = 5/9C + 32
  1. Define a lambda expression using lambda keyword.
  2. Specify that the lambda takes one parameter (celsius).
  3. Calculate Fahrenheit using the given formula.
  4. Set the Celsius temperature (celsius_temperature) in the second parentheses.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 5. Kapitel 4
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