Finished with first homework

HW1_holaquetal/hola.py

@@ -0,0 +1,51 @@
+import ply.lex as lex
+import ply.yacc as yacc
+
+tokens = [
+    'HOLA',
+    'COMA',
+    'QUE',
+    'TAL',
+]
+
+t_HOLA = r'hola'
+t_COMA = r','
+t_QUE = r'que'
+t_TAL = r'tal'
+t_ignore = r' '
+
+
+def t_error(t):
+    print("Illegal character!")
+    t.lexer.skip(1)
+
+
+lexer = lex.lex()
+
+
+def p_phrase(p):
+    '''
+    phrase : a QUE TAL
+    '''
+    print('✓✓✓ Valid phrase')
+
+
+def p_a(p):
+    '''
+    a : HOLA COMA a
+      | HOLA
+    '''
+
+
+def p_error(p):
+    print('xxx Invalid phrase')
+
+
+parser = yacc.yacc()
+
+while True:
+    try:
+        s = input('')
+    except EOFError:
+        break
+    parser.parse(s)