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72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
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"""
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Implements an is valid email address algorithm
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@ https://en.wikipedia.org/wiki/Email_address
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"""
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email_tests: tuple[tuple[str, bool], ...] = (
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("simple@example.com", True),
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("very.common@example.com", True),
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("disposable.style.email.with+symbol@example.com", True),
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("other-email-with-hyphen@and.subdomains.example.com", True),
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("fully-qualified-domain@example.com", True),
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("user.name+tag+sorting@example.com", True),
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("x@example.com", True),
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("example-indeed@strange-example.com", True),
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("test/test@test.com", True),
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(
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"1234567890123456789012345678901234567890123456789012345678901234567890@example.com",
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True,
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),
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("admin@mailserver1", True),
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("example@s.example", True),
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("Abc.example.com", False),
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("A@b@c@example.com", False),
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("a(c)d,e:f;g<h>i[j\\k]l@example.com", False),
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(
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"12345678901234567890123456789012345678901234567890123456789012345678901@example.com",
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False,
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),
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("i.like.underscores@but_its_not_allowed_in_this_part", False),
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)
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# The maximum octets (one character as a standard unicode character is one byte)
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# that the local part and the domain part can have
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MAX_LOCAL_PART_OCTETS = 64
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MAX_DOMAIN_OCTETS = 255
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def is_valid_email_address(email: str) -> bool:
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"""
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Returns True if the passed email address is valid.
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The local part of the email precedes the singular @ symbol and
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is associated with a display-name. For example, "john.smith"
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The domain is stricter than the local part and follows the @ symbol.
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>>> for email, valid in email_tests:
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... assert is_valid_email_address(email) is valid
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"""
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# Make sure that there is only one @ symbol in the email address
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if email.count("@") != 1:
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return False
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local_part, domain = email.split("@")
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# Check octet length of the local part and domain
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if len(local_part) > MAX_LOCAL_PART_OCTETS or len(domain) > MAX_DOMAIN_OCTETS:
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return False
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return True
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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for email, _ in email_tests:
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is_valid = is_valid_email_address(email)
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print(f"Email address {email} is {'not' if is_valid is False else ''} valid")
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