Functions in Python
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Functions are blocks of reusable code that perform specific tasks. There are three types of functions in Python: built-in functions, anonymous lambda functions, and user-defined functions. Functions help organize code by breaking programs into smaller, modular chunks. They reduce code duplication, decompose complex problems, improve clarity, and allow code reuse. Functions can take arguments and return values. Built-in functions are pre-defined to perform operations and return results when given the required arguments.
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Functions in Python
- 1. Function
- 2. What is Function? โข A function is a block of reusable code that is used to perform a specific action โข In Python, function is a group of related statements that perform a specific task. โข Functions help break our program into smaller and modular chunks. As our program grows larger and larger, functions make it more organized and manageable.
- 3. Why we use Function? โข Reducing duplication of code โข Decomposing complex problems into simpler pieces โข Improving clarity of the code โข Reuse of code โข Information hiding
- 4. โข There are three types of functions in Python: 1. Built-in function ,which are already pre defined. 2. Anonymous functions, which are also called lambda function 3. User-Defined Functions (UDFs), which are functions that users create to help them out; And Types of function
- 5. Syntax Function with arguments:- def function_name (argument1, argument2, ...) : statement_1 statement_2 .... Function without arguments:- def function_name() : statement_1 statement_2 ....
- 6. Lambda/Anonymous Forms/Function โข In Python, small anonymous (unnamed) functions can be created with lambda keyword. โข A lambda function can take any number of arguments, but can only have one expression. โข Syntax: - lambda arguments: expression
- 7. โข A function like this: def mul(x, y): return (x *y) print(mul4, 3)) โข may also be defined using lambda: print((lambda x, y: (x + y)/2)(4, 3))
- 8. Use of Lambda Function in python โข We use lambda functions when we require a nameless function for a short period of time. โข Lambda functions are used along with built-in functions like filter(), map() ,reduce(),etc. โข The filter() :- function in Python takes in a function and a list as arguments. โข Syntax: - list(filter(lambda arguments: expression, any_list))
- 9. โข The map() function in Python takes in a function and a list. โข Syntax: - list(map(lambda arguments: expression, any_list)) โข The reduce() function in Python takes in a function and a list. โข Syntax: - (reduce(lambda arguments: expression, any_list))
- 10. Built-In Function The function and specify the required arguments, then it will return the results. The type of the argument (e.g. string, list, integer, Boolean, etcโฆ) can be restricted (e.g. in some cases it has to be an integer), but in most cases it can be multiple value types.
- 11. Thank you