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 Need help with isdigit() and isalpha() function
#1
I need to write a program that has these conditions:
- Length must be exactly 9
- The first letter must be S, T, F or G
- Must consist of 7 digits
- Reference letter must be A to Z or a to z

Expected Output:

Output:
Enter String: S1234567A Valid String Enter String: X123456789B Error, Length must be exactly 9 Enter String: S12345XXB Error, Must consist of 7 digits
The requirement is to make use of isdigit() and isalpha() function but I read up on various resources online it seems it's most commonly used to return either True/False for the value.

My Code:

def main():
    enterstr = input("Enter String: ")
    firstletter = ["S", "T", "F", "G"]
    refletter = ['A', 'B', 'C', 'D']
    if enterstr.isdigit() < 7:
        print("Error, Must consist of 7 digits")
    elif enterstr.isalpha() [0] != firstletter:
        print("Error, The first letter must be S, T, F or G")
    elif enterstr.isalpha() [-1] != refletter:
        print("Error, Reference letter must be A to Z or a to z")
    elif enterstr.count < 9:
        print("Error, Length must be exactly 9")
    else:
        print("Valid String")
main()
I keep getting the output "Error, Must consist of 7 digits" no matter how many characters the String is. Need your advise, thanks.
Quote
#2
Isdigit and isalpha return true or false
len() returns the length of the object
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#3
You are trying to do too many things at once. Although you will get the skills to combine some of these processes, I strongly suggest you tackle the requirements one at a time, like this...
def main():
    enterstr = input("Enter String: ")
    valid_string = True
    """ First test - is the length exactly 9 """
    if len(enterstr) != 9 :
    """ Print the error message and change the flag"""
    """ Will leave the first letter check to you
        Next must contain 7 digits """
    digit_count = 0
    for index in range(0,8):
        if enterstr[index].isdigit():
            digit_count += 1
    """Now check to see if the digit count passes, print error if not, adjust the flag.
        """You can write the rest from here """
        
main()
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