E-Mail-Check-Lösung von gtuthey hinzugefügt

eure_loesungen/loesungen_in_python/aufgabe_W_7_05_emailcheck_gtuthey/LICENSE

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+MIT License
+
+Copyright (c) 2022 gtuthey
+Copyright (c) 2018 Luigi Lo Iacono, Stephan Wiefling, Michael Schneider
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

eure_loesungen/loesungen_in_python/aufgabe_W_7_05_emailcheck_gtuthey/emailcheck.py

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+def isEmail (email_address):
+    # finde das @ und den ersten . nach dem @
+    at = email_address.find("@")
+    dot = email_address.find(".",at)
+
+    # identifiziere die drei relevanten Teile der Adresse
+    prefix = email_address[0:at]
+    domain_name = email_address[at+1:dot]
+    suffix = email_address[dot+1:]
+
+    # Prüfe die Email-Teile
+    return len(prefix) > 1 and len(domain_name) >1 and domain_name.find("@") == -1 and (0 < len(suffix) <4)
+
+# Hauptprogramm
+print(isEmail("[email protected]"))
+print(isEmail("[email protected]"))
+print(isEmail("[email protected]"))
+print(isEmail("@.net"))
+print(isEmail("[email protected]"))
+
+# akzeptiert auch Emails, mit einem '.' vor dem '@'
+print(isEmail("[email protected]"))