I am in the process of developing a converter that changes binary numbers into decimal equivalents. To ensure accuracy and prevent errors, I want to validate user input by restricting it to only consist of zeroes and ones. Here is my current implementation:
while valueCheck == False:
value = input("Please provide the binary number you wish to convert to decimal.")
for i in value:
if not (i in "01"):
print("Kindly enter only zeroes and ones.")
break
else:
valueCheck = True
When a user submits an entry, the program checks its validity. If correct, valueCheck switches to True, concluding the loop and allowing the program's execution to proceed. However, if the entry is incorrect, valueCheck continues as False, prompting another request for input from the user.
Unfortunately, there is an issue with the validation logic. It only functions properly when the invalid character(s) are located at the beginning index of the input.
Here are some examples:
Input:
5111Output:
. User prompted for new input.Please enter only zeroes and onesInput:
1115Output:
. Program proceeds with invalid characters instead of stopping. This behavior is undesirable.Please enter only zeroes and ones
This anomaly occurs because the for loop begins inspecting the input from the first position onwards. Consequently, if the initial element has an inappropriate character, the output behaves as anticipated. Conversely, if the opening component contains an acceptable character, the procedure moves to else and terminates prematurely.
How can I modify the code to maintain the while loop until all characters within the input consist exclusively of zeroes and ones, irrespective of their location within the value string?