Python- Day6

Functions, and While Loop:

Functions:

Built-in Functions

Functions in Python are blocks of reusable code that perform a specific task. They allow you to organize your code into manageable sections and promote code reuse.

Defining a Function:

def function_name(parameters):
    # Function body
    function_name()

def my_function(name= input("What is your name? - ")):
    print(f"Hello, {name}!")
    
my_function()          # Output: Hello, Guest!
my_function("Welcome !")   # Output: Hello, Welcome!

>>

What is your name? - Nidhi
Hello, Nidhi!
Hello, Welcome !!

We can call a Function within a function:

def my_function(name= input("What is your name? - ")):
    print(f"Hello, {name}!")

def fun():
    print(f"This is for calling def my_function.")
    my_function()

fun()

>>

What is your name? - Nidhi
This is for calling def my_function.
Hello, Nidhi!

We have learned about the “for in” loop, let's use it:

def my_function(name= input("What is your name? - ")):
    print(f"Hello, {name}!")

def fun():
    print(f"This is for calling def my_function.")
    my_function()

for say in range(6):
    fun()

>>

What is your name? - Nidhi
This is for calling def my_function.
Hello, Nidhi!
This is for calling def my_function.
Hello, Nidhi!
This is for calling def my_function.
Hello, Nidhi!
This is for calling def my_function.
Hello, Nidhi!

"While" loop:

while something_is_true:  #Condition
 #Do it repeatedly
 #Mentioned here

#Defining value in code 

number = 1

# While loop to print numbers from 1 to 10
while number <= 10:
    print(number)
    # Increment the number by 1
    number += 1

>>

1
2
3
4
5
6
7
8
9
10

#Asking user for input 

user_number =  int(input("Enter the number -  "))

num = 1                  #start number from 
                         # While loop to print numbers from 1 to 10
while num <= user_number:
    print(num)
                         # Increment the number by 1
    num += 1

>>

Enter the number -  5
1
2
3
4
5

While not/ !=

correct_password = "secret"
user_input = ""

while not user_input == correct_password:  # We can use while not / !=
    user_input = input("Enter the password: ")

print("Access granted!")

correct_password = "secret"
user_input = ""

while user_input != correct_password:    # We can use while not / !=
    user_input = input("Enter the password: ")

print("Access granted!")

Adding If/else :

correct_password = "secret"
user_input = ""

while user_input != correct_password:
    user_input = input("Enter the password: ")

    if user_input == correct_password:
        print("Access granted!")
    else:
        print("Incorrect password, please try again.")

>>

Enter the password: 123
Incorrect password, please try again.
Enter the password: 258
Incorrect password, please try again.
Enter the password: adda
Incorrect password, please try again.
Enter the password: secret
Access granted!

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