In Python, first-class objects (also known as first-class citizens) refer to entities that can be treated like any other object, they can be:
Assigned to a variable
Passed as an argument to a function.
Returned from a function.
Stored in data structure like lists, dictionaries, etc.
Example:
Functions, Classes, Module, Objects.
Function as first class object.
In Python, functions are first-class objects. This means that functions can be passed as argument, return a function, assign a function to a name (also known as function pointer).
Benefits of First-Class Objects:
Higher-Order Functions: Functions that can take other functions as arguments or return them, leading to powerful programming patterns.
Closures: Functions that capture the local state, which is useful in scenarios like decorators.
Functional Programming: Encourages a functional programming style where functions are treated as values.
Callbacks: You can implement callbacks where one function is passed to another function to be executed later.
Lambda Function:
For smaller pieces of code, in Python you do not need to define separate functions.
Instead, you can use 'lambda' keyword to define anonymous function
Also known as "Lambda Expression.
Syntax:
func_variable = lambda arg-list(s) : expression
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