更新 'tt.py'

tt.py

@@ -1,74 +1,20 @@
-symbol_priority = {}
-symbol_priority[0] = ['#']
-symbol_priority[1] = ['(']
-symbol_priority[2] = ['+', '-']
-symbol_priority[3] = ['*', '/']
-symbol_priority[4] = [')']
-def comparePriority(symbol, RPN_stack, symbol_stack):
-  global symbol_priority
-  if len(symbol_stack) > 0:
-    symbol_pop = symbol_stack.pop()
-  else:
-    return
-  for list in symbol_priority.values():
-    if (symbol in list) and (symbol_pop in list):
-      symbol_stack.append(symbol_pop)
-      symbol_stack.append(symbol)
-      return
-    elif symbol in list:
-      RPN_stack.append(symbol_pop)
-      #recusion call
-      comparePriority(symbol, RPN_stack, symbol_stack)
-      return
-    elif symbol_pop in list:
-      symbol_stack.append(symbol_pop)
-      symbol_stack.append(symbol)
-      return
+s = '1 2 + 5 4 - *'
+L = s.split()
+print L
+
+def f(i,s,S=[]):
+    if i==len(s):
+        return S
+
+    a=s[i]
+    if a.isdigit():
+        S.append(a)
+        return f(i+1,s,S)
     else:
-      continue
-    symbol_stack.append(symbol_pop)
-    return
-def scanEveryone(input_string, RPN_stack, symbol_stack):
-  for ch in input_string:
-    if ch.isdigit():
-      RPN_stack.append(ch)
-    else:
-      if len(symbol_stack) > 0:
-        if ch == '(':
-          symbol_stack.append(ch)
-        elif ch == ')':
-          while True:
-            symbol_pop = symbol_stack.pop()
-            if symbol_pop == '(':
-              break
-            else:
-              RPN_stack.append(symbol_pop)
-        else:
-          comparePriority(ch, RPN_stack, symbol_stack)
-      else:
-        symbol_stack.append(ch)
-def scanInput(RPN_stack, symbol_stack):
-  input_string = raw_input()
-  input_string += '#'
-  scanEveryone(input_string, RPN_stack, symbol_stack)
-def calRPN(RPN_stack):
-  value_stack = []
-  RPN_stack.append('#')
-  for value in RPN_stack:
-    if value == '#':
-      return value_stack.pop()
-      break
-    if value.isdigit():
-      value_stack.append(value)
-    else:
-      right_value = value_stack.pop()
-      left_value = value_stack.pop()
-      cal_string = left_value + value + right_value
-      value_stack.append(str(eval(cal_string)))
-def main():
-  RPN_stack = []
-  symbol_stack = []
-  scanInput(RPN_stack, symbol_stack)
-  print calRPN(RPN_stack)
-if __name__ == '__main__':
-  main()
+        c = S.pop()
+        d = S.pop()
+        e = '%s%s%s'%(c,a,d)
+        S.append(eval(e))
+        return f(i+1,s,S)
+
+print f(0,L)