Exercise for reference: 

Create a program that asks the user to enter a new password and check that the submitted password should contain at least one number, one uppercase letter, and at least 5 characters. If the conditions are generated, print out "Password is fine"; otherwise, keep prompting the user for a password.

Answer: 

while True:
    psw = input("Enter new password: ")
    if any(i.isdigit() for i in psw) and any(i.isupper() for i in psw) and len(psw) >= 5:
        print("Password is fine")
        break
    else:
        print("Password is not fine")

Explanation:

We're using a while  loop here because we need to keep the program running until the user submits a password that satisfies all three conditions. Line 3 contains the three conditions connected with an and  operator. Line 3 becomes True  only when all three conditions are True . If that happens, Password is fine  is generated, and the break  statement will break the loop, and the program will stop. If at least one of the conditions in Line 3 is False Line 3 evaluates to False  and the print  statement under else is executed, and the loop starts over again.