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rvente/hex_to_bin.py

Last active April 1, 2022 03:31
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Revisions

  1. rvente revised this gist Apr 1, 2022. 1 changed file with 16 additions and 0 deletions.
    16 changes: 16 additions & 0 deletions hex_to_bin.py
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,16 @@
    prompt = "Enter a hex digit: "
    reject_too_long = "Only one number must be input."
    reject_invalid_input = "Invalid input"

    hex_candidate = input(prompt).upper()
    if len(hex_candidate) != 1:
    print(reject_too_long)
    elif not hex_candidate.isalnum():
    print(reject_invalid_input)
    elif not "A" <= hex_candidate <= "F":
    # by this point digit is alphanumeric
    # so we only have to check if it's in range [A, F]
    print(reject_invalid_input)
    else:
    numeric = int(hex_candidate, 16)
    print(bin(numeric)[2:])
  2. rvente created this gist Apr 1, 2022.
    22 changes: 22 additions & 0 deletions isbn.py
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,22 @@

    prompt = "Enter the first 9 digits of an ISBN string: "
    reject_non_nine = "Incorrect Input. It must have exact 9 digits"
    reject_non_numeric = "Incorrect Input. All should be digits."
    accept_msg = "The ISBN-10 number is"
    nine_digits = input(prompt)

    if len(nine_digits) != 9:
    print(reject_non_nine)
    elif not nine_digits.isdecimal():
    # should not be needed but required for safety
    print(reject_non_numeric)
    else: # numeric and length 9
    running_total = 0
    for index,digit in enumerate(nine_digits):
    running_total += (index+1) * int(digit)

    checksum_string = str(running_total % 11)
    if checksum_string == "10":
    checksum_string = "X"

    print(accept_msg, nine_digits+checksum_string)