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Fix validate_initial_digits of credit_card_validator.py (#5600)

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* Fix validate_initial_digits of credit_card_validator.py

@Bhargavishnu I think that I broke the logic of validate_initial_digits which should require that credit_card_number[0] is 3 before checking that credit_card_number[1] is 4, 5, or 7.  Please verify the new changes and the new test cases to make sure that this is correct.  Thanks!

* updating DIRECTORY.md

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Christian Clauss 2021-10-26 14:32:34 +02:00 committed by GitHub
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2 changed files with 4 additions and 4 deletions
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DIRECTORY.md
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@ -944,6 +944,7 @@
* [Capitalize](https://github.com/TheAlgorithms/Python/blob/master/strings/capitalize.py)
* [Check Anagrams](https://github.com/TheAlgorithms/Python/blob/master/strings/check_anagrams.py)
* [Check Pangram](https://github.com/TheAlgorithms/Python/blob/master/strings/check_pangram.py)
* [Credit Card Validator](https://github.com/TheAlgorithms/Python/blob/master/strings/credit_card_validator.py)
* [Detecting English Programmatically](https://github.com/TheAlgorithms/Python/blob/master/strings/detecting_english_programmatically.py)
* [Frequency Finder](https://github.com/TheAlgorithms/Python/blob/master/strings/frequency_finder.py)
* [Indian Phone Validator](https://github.com/TheAlgorithms/Python/blob/master/strings/indian_phone_validator.py)
@ -961,6 +962,7 @@
* [Rabin Karp](https://github.com/TheAlgorithms/Python/blob/master/strings/rabin_karp.py)
* [Remove Duplicate](https://github.com/TheAlgorithms/Python/blob/master/strings/remove_duplicate.py)
* [Reverse Letters](https://github.com/TheAlgorithms/Python/blob/master/strings/reverse_letters.py)
* [Reverse Long Words](https://github.com/TheAlgorithms/Python/blob/master/strings/reverse_long_words.py)
* [Reverse Words](https://github.com/TheAlgorithms/Python/blob/master/strings/reverse_words.py)
* [Split](https://github.com/TheAlgorithms/Python/blob/master/strings/split.py)
* [Upper](https://github.com/TheAlgorithms/Python/blob/master/strings/upper.py)

6
strings/credit_card_validator.py
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@ -11,13 +11,11 @@ def validate_initial_digits(credit_card_number: str) -> bool:
>>> valid = "4111111111111111 41111111111111 34 35 37 412345 523456 634567"
>>> all(validate_initial_digits(cc) for cc in valid.split())
True
>>> invalid = "32323 36111111111111"
>>> invalid = "14 25 76 32323 36111111111111"
>>> all(validate_initial_digits(cc) is False for cc in invalid.split())
True
"""
if len(credit_card_number) < 2:
return False
return credit_card_number[0] in "456" or credit_card_number[1] in "457"
return credit_card_number.startswith(("34", "35", "37", "4", "5", "6"))
def luhn_validation(credit_card_number: str) -> bool: