--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ply-3.8/test/lex_object.py	Wed Mar 23 02:40:16 2016 +0000
@@ -0,0 +1,55 @@
+# -----------------------------------------------------------------------------
+# lex_object.py
+# -----------------------------------------------------------------------------
+import sys
+
+if ".." not in sys.path: sys.path.insert(0,"..")
+import ply.lex as lex
+
+class CalcLexer:
+    tokens = (
+        'NAME','NUMBER',
+        'PLUS','MINUS','TIMES','DIVIDE','EQUALS',
+        'LPAREN','RPAREN',
+        )
+
+    # Tokens
+
+    t_PLUS    = r'\+'
+    t_MINUS   = r'-'
+    t_TIMES   = r'\*'
+    t_DIVIDE  = r'/'
+    t_EQUALS  = r'='
+    t_LPAREN  = r'\('
+    t_RPAREN  = r'\)'
+    t_NAME    = r'[a-zA-Z_][a-zA-Z0-9_]*'
+
+    def t_NUMBER(self,t):
+        r'\d+'
+        try:
+            t.value = int(t.value)
+        except ValueError:
+            print("Integer value too large %s" % t.value)
+            t.value = 0
+        return t
+
+    t_ignore = " \t"
+
+    def t_newline(self,t):
+        r'\n+'
+        t.lineno += t.value.count("\n")
+        
+    def t_error(self,t):
+        print("Illegal character '%s'" % t.value[0])
+        t.lexer.skip(1)
+        
+
+calc = CalcLexer()
+
+# Build the lexer
+lex.lex(object=calc)
+lex.runmain(data="3+4")
+
+
+
+