Sample codes for basic Python

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factorial	Factorial of an input number by looping and by recursive functions
factors	Factors of an input number
Prime Numbers	Prime Numbers
Fibonacci	Fibonacci numbers by looping and by recursive functions
Sum of Digits	Sum of digits of an input number
Multiplication table	Multiplication table using nested for loops
strong number	Check input number is strong number or not
Armstrong number	Check input number is Armstrong number or not
Digit Cubes	Number equal to sum of cubes of its digits

Sum of three user input numbers

int() to get Integer from String

a=int(input("Enter first Number"))
b=int(input("Enter second Number"))
c=int(input("Enter third Number"))
sum=a+b+c
print(sum)

Enter mark to get status of your division

 m=int(input("Enter your marks"))
if(m>=90):
    print("You have Passed with First Distinction")

else:
    if(m>=60):
        print("You have passed with Second Distinction")
    else:
        if(m>=35):
            print("You have just passed work hard next time")
        else:
            print("Failed")

In place of using multiple if else , it is better to use elif.
Read more how to use elif to get the grade from input mark.

Converting Decimal to Binary number

def my_binary(n):
    i=''
    while n>1:
        a = n%2
        n = n//2
        i=str(a)+i
    i=  str(n%2) +i   
    print (i)
    
a=my_binary(156)

round a number without using round() function

x=float(input("input number "))
y=int(x+0.5)
print(y)

All String methods casefold() string to lowercase Python- Tutorials

Sample codes in Python

Sum of three user input numbers

Enter mark to get status of your division

Converting Decimal to Binary number

round a number without using round() function