mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 21:41:08 +00:00
4b79d771cd
* Add more ruff rules * Add more ruff rules * pre-commit: Update ruff v0.0.269 -> v0.0.270 * Apply suggestions from code review * Fix doctest * Fix doctest (ignore whitespace) * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci --------- Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com> Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
90 lines
2.1 KiB
Python
90 lines
2.1 KiB
Python
"""
|
|
https://en.wikipedia.org/wiki/Check_digit#Algorithms
|
|
"""
|
|
|
|
|
|
def get_check_digit(barcode: int) -> int:
|
|
"""
|
|
Returns the last digit of barcode by excluding the last digit first
|
|
and then computing to reach the actual last digit from the remaining
|
|
12 digits.
|
|
|
|
>>> get_check_digit(8718452538119)
|
|
9
|
|
>>> get_check_digit(87184523)
|
|
5
|
|
>>> get_check_digit(87193425381086)
|
|
9
|
|
>>> [get_check_digit(x) for x in range(0, 100, 10)]
|
|
[0, 7, 4, 1, 8, 5, 2, 9, 6, 3]
|
|
"""
|
|
barcode //= 10 # exclude the last digit
|
|
checker = False
|
|
s = 0
|
|
|
|
# extract and check each digit
|
|
while barcode != 0:
|
|
mult = 1 if checker else 3
|
|
s += mult * (barcode % 10)
|
|
barcode //= 10
|
|
checker = not checker
|
|
|
|
return (10 - (s % 10)) % 10
|
|
|
|
|
|
def is_valid(barcode: int) -> bool:
|
|
"""
|
|
Checks for length of barcode and last-digit
|
|
Returns boolean value of validity of barcode
|
|
|
|
>>> is_valid(8718452538119)
|
|
True
|
|
>>> is_valid(87184525)
|
|
False
|
|
>>> is_valid(87193425381089)
|
|
False
|
|
>>> is_valid(0)
|
|
False
|
|
>>> is_valid(dwefgiweuf)
|
|
Traceback (most recent call last):
|
|
...
|
|
NameError: name 'dwefgiweuf' is not defined
|
|
"""
|
|
return len(str(barcode)) == 13 and get_check_digit(barcode) == barcode % 10
|
|
|
|
|
|
def get_barcode(barcode: str) -> int:
|
|
"""
|
|
Returns the barcode as an integer
|
|
|
|
>>> get_barcode("8718452538119")
|
|
8718452538119
|
|
>>> get_barcode("dwefgiweuf")
|
|
Traceback (most recent call last):
|
|
...
|
|
ValueError: Barcode 'dwefgiweuf' has alphabetic characters.
|
|
"""
|
|
if str(barcode).isalpha():
|
|
msg = f"Barcode '{barcode}' has alphabetic characters."
|
|
raise ValueError(msg)
|
|
elif int(barcode) < 0:
|
|
raise ValueError("The entered barcode has a negative value. Try again.")
|
|
else:
|
|
return int(barcode)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|
|
"""
|
|
Enter a barcode.
|
|
|
|
"""
|
|
barcode = get_barcode(input("Barcode: ").strip())
|
|
|
|
if is_valid(barcode):
|
|
print(f"'{barcode}' is a valid barcode.")
|
|
else:
|
|
print(f"'{barcode}' is NOT a valid barcode.")
|