CS-PreRelease_Task2.py

'''
Task 2
by Mark Wu

Format: Ull000

Here's two different solutions to this question,
using either Built-in functions or Regular Expression
'''

# --------------------Task 2.1--------------------
'''
UserID <-- ''
PRINT "Please input UserID:"
INPUT UserID
IF LENGTH(UserID) = 6 THEN
    IF LEFT(UserID, 1) = UCASE(LEFT(UserID, 1)) AND
       MID(UserID, 2, 2) = LCASE(MID(UserID, 2, 2)) AND
       (ASC(RIGHT(UserID, 1)) >= 48 AND ASC(RIGHT(UserID, 1)) <= 57) AND
       (ASC(MID(UserID, 4, 1)) >= 48 AND ASC(MID(UserID, 4, 1)) <= 57) AND
       (ASC(MID(UserID, 5, 1)) >= 48 AND ASC(MID(UserID, 5, 1)) <= 57)
    THEN
        OUTPUT "Correct Format"
    ELSE
        OUTPUT "Wrong Format"
ELSE
    OUTPUT "Wrong Format"
'''

# --------------------Task 2.2--------------------
# Solution 1 (using Built-in function)
print('--------------------Task 2.2--------------------')
user_input = input("Please input user ID?")

while True:
    if len(user_input) != 6:
        print("Invalid ID. It should have a length of 6")
        user_input = input("Please input user ID?")
    else:
        break

# Validation
if user_input[0].isupper() and user_input[1:3].islower() and user_input[3:].isnumeric():
    print("True. The input ID (%s) is valid." % user_input)
else:
    print("False. The input ID (%s) is invalid." % user_input)

# # Solution 2 (using RE)
# import re
# user_input = input("Please input user ID?")
#
# myRex = re.compile(r'^[A-Z][a-z]{2}\d\d\d$')
#
# mo = myRex.search(user_input)
#
# if mo == None:
#     print("False. The input ID (%s) is invalid." % user_input)
# else:
#     print("True. The input ID (%s) is valid." % user_input)

# --------------------Task 2.3--------------------
print('--------------------Task 2.3--------------------')
# Solution 1 (using Built-in function)
user_input = input("Please input user ID?")

while True:
    if len(user_input) != 6:
        print("Invalid ID. It should have a length of 6")
        user_input = input("Please input user ID?")
    else:
        break

# Validation
if user_input[:3].isalpha() and user_input[3:].isnumeric():
    print("True. The input ID (%s) is valid." % user_input)
else:
    print("False. The input ID (%s) is invalid." % user_input)

# # Solution 2 (using RE)
# import re
# user_input = input("Please input user ID?")
#
# myRex = re.compile(r'^[A-Za-z]{3}\d\d\d$')
#
# mo = myRex.search(user_input)
#
# if mo == None:
#     print("False. The input ID (%s) is invalid." % user_input)
# else:
#     print("True. The input ID (%s) is valid." % user_input)

# --------------------Task 2.4--------------------
print('--------------------Task 2.4--------------------')
# Solution 1 ONLY (using Built-in function)
user_input = input("Please input user ID?")

while True:
    if len(user_input) != 6:
        print("Invalid ID. It should have a length of 6")
        user_input = input("Please input user ID?")
    else:
        break


# Validation Function
def ValidateuserID(instring):
    if instring[:3].isalpha() and instring[3:].isnumeric():
        return True
    else:
        return False


print("The validity of ID: " + str(ValidateuserID(user_input)))