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Functions
#1
FUCNTION:
def CheckInput(ID):
    while True:
        ID = input("Please enter your ID: ")
        if len(ID) == 8:
            print("Thanks for the input ", ID)
            break
        else:
            print(ID, " does not contain 8 alphanumeric characters, please enter your ID again")

Calling function:

Error:
CheckInput() Traceback (most recent call last): File "<ipython-input-11-6e7f44b6eb76>", line 1, in <module> CheckInput() TypeError: CheckInput() missing 1 required positional argument: 'ID'
CheckInput(1)

Please enter your ID: KM
KM does not contain 8 alphanumeric characters, please enter your ID again

Please enter your ID: KMkmkmkm
Thanks for the input KMkmkmkm

FUNCTION:
def CheckInput(ID):
    while True:
        ID = input("Please enter your ID: ")
        if len(ID) == 8:
            print("Thanks for the input ", ID)
            break
        else:
            print(ID, " does not contain 8 alphanumeric characters, please enter your ID again")

Calling Function:
Not Working:

CheckInput()
Error:
Traceback (most recent call last): File "<ipython-input-14-6e7f44b6eb76>", line 1, in <module> CheckInput() TypeError: CheckInput() missing 1 required positional argument: 'ID'
Working:
CheckInput(1)

Please enter your ID: KM000000
Thanks for the input KM000000

def CheckInput():
    while True:
        ID = input("Please enter your ID: ")
        if len(ID) == 8:
            print("Thanks for the input ", ID)
            break
        else:
            print(ID, " does not contain 8 alphanumeric characters, please enter your ID again")

Not working:
CheckInput(1)
Error:
Traceback (most recent call last): File "<ipython-input-17-782b94db3014>", line 1, in <module> CheckInput(1) TypeError: CheckInput() takes 0 positional arguments but 1 was given
Working:
CheckInput()

Please enter your ID: KM000000
Thanks for the input KM000000

I need to use this function to validate my input in the below code:
How can I make that function call in the below code.
I need to validate the ID captured as in the below code and only then the next input() i.e doctor will be captured.
import datetime
from datetime import datetime
n = 5
while n > 0:
    id = input("Please enter your ID: ")
    with open("C:\\Users\\ABCD\\EFG\\" "%s.txt" % id, "a") as file:
        ID = input("Please provide your ID: ")
        Doctor = input("Please provide the name of the doctor you would like to visit: ")
Thanks
Reply
#2
def check_input():
    while True:
        id = input("Please enter your ID: ")
        if len(id) == 8:
            print("Thanks for the input ", id)
            return id
        else:
            print(id, " does not contain 8 alphanumeric characters, please enter your ID again")

id = check_input()
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