Merge pull request geekcomputers#340 from the-vishal/master

Added credit card validator script

Credit_Card_Validator.py

@@ -0,0 +1,93 @@
+#luhn algorithm
+
+class CreditCard:
+    def __init__(self,card_no):
+        self.card_no = card_no
+
+
+    @property
+    def company(self):
+        comp =None
+        if str(self.card_no).startswith('4'):
+             comp = 'Visa Card'
+        elif str(self.card_no).startswith('5'):
+            comp = 'Master Card'
+        elif str(self.card_no).startswith('37'):
+            comp = 'American Express Card'
+        elif str(self.card_no).startswith('6'):
+            comp = 'Discover Card'
+        elif str(self.card_no).startswith('35'):
+            comp = 'JCB Card'
+        elif str(self.card_no).startswith('50' or '67'or '58'or'63'):
+            comp = 'Maestro Card'
+        elif str(self.card_no).startswith('7'):
+            comp = 'Gasoline Card'
+
+        return 'Company : '+comp
+
+
+
+    def first_check(self):
+        if 13<=len(self.card_no)<=19:
+            message = "First check : Valid in terms of length."
+
+        else:
+            message = "First chek : Check Card number once again it must be of 13 or 16 digit long."
+        return message
+
+
+
+
+    def validate(self):
+        #double every second digit from right to left
+        sum_=0
+        crd_no = self.card_no[::-1]
+        for i in range(len(crd_no)):
+            if i%2==1:
+                double_it = int(crd_no[i])*2
+
+                if len(str(double_it))==2:
+                    sum_ += sum([eval(i) for i in str(double_it)])
+
+                else:
+                    sum_+=double_it
+
+            else:
+                sum_+=int(crd_no[i])
+
+
+
+        if sum_%10==0:
+            response = "Valid Card"
+        else:
+            response = 'Invalid Card'
+
+        return response
+
+
+
+    @property
+    def checksum(self):
+        return '#CHECKSUM# : '+self.card_no[-1]
+
+
+    @classmethod
+    def set_card(cls,card_to_check):
+        return cls(card_to_check)
+
+
+
+card_number  = input()
+card = CreditCard.set_card(card_number)
+print(card.company)
+print('Card : ',card.card_no)
+print(card.first_check())
+print(card.checksum)
+print(card.validate())
+
+
+
+# 79927398713
+#4388576018402626
+#379354508162306
+