diff --git a/‎class BasicLexer with python programming‎
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+ tokens = { NAME, NUMBER, STRING } 
+    ignore = '\t '
+    literals = { '=', '+', '-', '/',  
+                '*', '(', ')', ',', ';'} 
+  
+  
+    # Define tokens as regular expressions 
+    # (stored as raw strings) 
+    NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
+    STRING = r'\".*?\"'
+  
+    # Number token 
+    @_(r'\d+') 
+    def NUMBER(self, t): 
+        
+        # convert it into a python integer 
+        t.value = int(t.value)    return t 
+  
+    # Comment token 
+    @_(r'//.*') 
+    def COMMENT(self, t): 
+        pass
+  
+    # Newline token(used only for showing 
+    # errors in new line) 
+    @_(r'\n+') 
+    def newline(self, t): 
+        self.lineno = t.value.count('\n')