Steps followed:
1. take input from user and store in var variable
2. use len function to return length of the provided string
3. print result

Program

#python program to find length of a string using len function

#getting input from user and storing in var variable

var=input("Enter a string: ")

#len function returns length of the provided string

length = len(var)

#print result

print("length of the input string - '%s' is %d"%(var,length))

Output

Enter a string: sun rises in the east

length of the input string - 'sun rises in the east' is 21

► Python program to find length of a string using len function