6 | Functions | Python for Complete Beginners

Veröffentlicht am: 15 Juli 2023
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print("Hello from functions")

a block of code which runs only when called
we can pass data to a func - parameters
func can return data as result

def func_name(parameters):
statements

def hello(name):
print("Hello", name)

hello("Python")
hello("Eric")

func to add 2 numbers

def add(num1, num2):
return (num1 + num2)

print(add(2, 4))
print(add(5, 6))

Built-in functions
print(), input(), range()

variables

x = 10

def my_func():
x = 5
print('value of x inside func is: ', x)

my_func()
print('value of x outside func is: ', x)

Arguments (Parameters)

def hello(name, msg):
print("Hello", name + ', ' + msg)

hello("Python", "Good Morning")

default arguments

def hello(name, msg="How are you"):
print("Hello", name + ', ' + msg)

hello("Python", "Great to see you")

Positional arguments
def hello(name, msg):
print("Hello", name + ', ' + msg)

hello("Eric", "Good Evening")
hello(msg="How are you", name="Elvis")

Arbitrary arguments
when we are not sure about the num of arguments

def hello(*names):
print("Hello", names)

hello('Eric', "Monica", "Elvis")

Anonymous func | Lambda functions
we can define a func without a name

lambda arguments: expression

sum = lambda a, b, c: a + b + c
print(sum(2, 3, 4))

Recursive functions
a func can call other func and also itself
a func that calls itself - recursive func
procees - recusrsion

prog to find sum of natural numbers
1+2+3+..n

def calculate_sum(n):
if n == 1:
return 1
else:
return n + calculate_sum(n - 1)

sum = calculate_sum(10)
print(sum)

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