正確添加

Question

我必須定義一個函數，它包含一個字符串列表。推，流行和窺視。

def digit_stack(commands): 
    stack = [] 
    sums = 0 
    for i in commands: 
     if "PUSH" in i: 
      for n in i: 
       if n.isdigit(): 
        stack.append(int(n)) 
     return stack 

然而

digit_stack("PUSH 3", "PUSH 4") == [3] 

爲什麼它只是附加的第一推？

Answer 1

您return一次迭代後：

for i in commands: 
    if "PUSH" in i: 
     for n in i: 
      if n.isdigit(): 
       stack.append(int(n)) 
return stack # move outside the loop