python Function
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This document discusses Python functions. It defines a function as a block of code that performs a specific task. Functions help break programs into smaller, modular chunks. The document explains how to define functions using the def keyword, how to call functions, and how functions can take arguments. It also covers default arguments, keyword arguments, arbitrary arguments, recursion, anonymous functions, and provides examples of each.
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![ double = lambda x: x * 2 print(double(5))
my_list = [1, 5, 4, 6, 8, 11, 3, 12]
new_list = list(filter(lambda x: (x%2 == 0) , my_list))
print(new_list)
EXAMPLE OF LAMBDA
FUNCTION](https://image.slidesharecdn.com/functionseminar-160523044634/85/python-Function-18-320.jpg)
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python Function
- 1. PRESENTED BY, RONAK RATHI & SAMIR RAWAT.
- 2. OBJECTIVE HOW TO DEFINE A FUNCTION HOW TO CALL A FUNCTION FUNCTION ARGUMENTS FUNCTION RECURSION
- 3. FUNCTION FUNCTION IS A GROUP OF RELATED STATEMENTS THAT PERFORM A SPECIFIC TASK FUNCTIONS HELP BREAK OUR PROGRAM INTO SMALLER AND MODULAR CHUCKS
- 4. DEFINING FUNCTION def marks the start of function function name to uniquely identify a function. def function_name (parameter) : Argument to pass a value in function colon(:) to mark end of function header
- 5. EXAMPLE OF FUNCTION def greet (name): print(“Hello,” + name +” . Good afternoon!”)
- 6. CALLING A FUNCTION HOW TO CALL A FUNCTION? Once we have defined a function, we can call it from another function, program or even the Python prompt. To call a function we simply type the function name with appropriate parameters. >>> greet(“everyone") >>>Hello, everyone. Good afternoon!
- 7. EXAMPLE def my_func(): x = 10 global y y = 20 print("Value of y inside function:",x) print("Value of y inside function:",y) x = 20 y = 10 my_func() print("Value of y outside function:",x) print("Value of y outside function:",y)
- 8. THERE ARE TWO TYPES OF FUNCTION IN PYTHON BUILT-IN FUNCTION Example: print(), input(), eval(). USERDEFINE FUNCTION Example: def my_addition(x,y): sum = x + y return sum
- 9. FUNCTION BUILT WITHIN THE PYTHON. THERE ARE 68 BUILT-IN FUNCTION VERSION 3.4. CHANGES WITH RESPECT TO UPDATED VERSION.
- 11. DEFAULT ARGUMENTS Default value to function argument is passed using assignment operator ‘ = ‘. Example: def greet(name, msg = "Good morning!"): print("Hello, " name + ', ' + msg) Non-default argument cannot follow default argument Example: def greet(msg = "Good morning!", name): SyntaxError: non-default argument follows default argument
- 12. KEYWORD ARGUMENTS When we call a function with some values, these values get assigned to the arguments according to their position . Keyword arguments follows positional argument.
- 13. EXAMPLE OF KEYWORD ARGUMENT greet(name = "Bruce",msg = "How do you do?") 2 keyword arguments greet(msg = "How do you do?",name = "Bruce") 2 keyword arguments (out of order) greet("Bruce",msg = "How do you do?") 1 positional, 1 keyword argument greet(name="Bruce","How do you do?") SyntaxError: non-keyword arg after keyword arg
- 14. If number of arguments unknown we use arbitrary arguments ( * ) Asterisk before arguments define arbitrary arguments. Example: def greet(*names): for name in names: print("Hello",name) >>>greet("Monica","Luke","Steve","John") ARBITRARY ARGUMENTS
- 15. Like other programming language in python, function can call itself. Definition of recursion in python is same as other programming lang. -> C, C++, C#, Java etc.
- 16. def recur_fact(x): if x == 1: return 1 else: return (x * recur_fact(x-1)) num = int(input("Enter a number: ")) if num >= 1: print("The factorial of", num, "is", recur_fact(num)) EXAMPLE OF RECURSION
- 17. Function without function name. Function is defined using lambda keyword, hence function is also called Lambda function. Used for short period in python. Can have any number of arguments but only single expression. Specially used with built-in functions like filter(), map() etc. ANONYMOUS
- 18. double = lambda x: x * 2 print(double(5)) my_list = [1, 5, 4, 6, 8, 11, 3, 12] new_list = list(filter(lambda x: (x%2 == 0) , my_list)) print(new_list) EXAMPLE OF LAMBDA FUNCTION
- 20. THANK YOU HAVE A NICE DAY!