Strings Review - Code Academy

Description.txt

Let’s start with username_generator.
Create a function called username_generator take two inputs, first_name and last_name and returns a username. 
The username should be a slice of the first three letters of their first name and the first four letters of their last name. 
If their first name is less than three letters or their last name is less than four letters it should use their entire names.
For example, if the employee’s name is Abe Simpson the function should generate the username AbeSimp.

Now for the temporary password, they want the function to take the input user name and shift all of the letters by one to the right, so the last letter of the username ends up as the first letter and so forth. 
For example, if the username is AbeSimp, then the temporary password generated should be pAbeSim.

StringReview.py

def username_generator(first_name, last_name):
  # no if statement needed even if first/last name are shorter than end bound of slicing
  return first_name[:3] + last_name[:4]

''' 
# solution without for loop 
def password_generator(username):
  return username[-1] + username[0:-1] 
'''
def password_generator(username):
  password = ""
  for i in range(len(username)):
    password = password + username[i - 1]
  return password

# test cases 
print(username_generator("J", "Le"))
print(password_generator("Jerry"))