更新 'tt.py'

tt.py

@@ -1,12 +1,20 @@
-s = '1 2 + 5 4 - *'
-L = s.split()
-print L
+def toList(s):
 
-def f(i,s,S=[]):
-    if i==len(s):
-        return S
+    L = []
+    for i in s:
+        if i != '\n':
+            L.append(i)
+    return L
 
-    a=s[i]
+def f(i,s,S = None):
+    
+    if not S:
+        S = []
+        
+    if i == len(s):
+        return S[0]
+
+    a = s[i]
     if a.isdigit():
         S.append(a)
         return f(i+1,s,S)
@@ -16,5 +24,3 @@ def f(i,s,S=[]):
         e = '%s%s%s'%(c,a,d)
         S.append(eval(e))
         return f(i+1,s,S)
-
-print f(0,L)