我正在尝试在已定义的同一函数内调用函数

时间：2019-03-17 20:11:45

标签： python python-3.5

我正在尝试这样做：

def enter():
    print("hi")
    enter()

但是，起初它给了我：

hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi

但是，在数据流之后，它开始给我这样的错误：

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter
    enter()
  File "C:/Users/offcampus/AppData/Local/Programs/Python/Python35/len finder.py", line 11, in enter

它说我已经达到最大深度的递归错误，有人可以告诉我如何解决。

如果有人告诉我递归错误甚至意味着什么，也将不胜感激。

提前谢谢！

1 个答案:

答案 0 :(得分：2)

在内部调用函数称为递归，它是循环的替代方法。但这是有代价的。 Python需要“记住”以前对该函数的所有调用，而不是每次都会重置的循环。因此，您可以理解为什么您的计算机最终会耗尽内存，因为您没有 stop 调用Dim cell As Range Dim rng As Range Dim Position As Integer Set rng = ThisWorkbook.Worksheets("Data").Range("A1:A4000") For Each cell In rng Position = InStr(cell.Value, "(") - 2 cell.Value = CStr(Left(cell.Value, Position)) Next cell 。

这称为堆栈溢出-即，当计算机的“堆栈”（内存）溢出（变得太高且有点倒塌）时。其他较旧的语言（例如C）根本无法很好地解决这一问题，并且堆栈溢出有点儿成为程序员要处理的事情（这就是为什么将其称为StackOverflow.com的原因-帮助其他问题）。

为避免这种情况，Python设置了可以递归的距离限制，而超过此限制将引发错误（而不是破坏计算机）。为防止您的代码达到此限制（非常高），您需要指定一个退出条件。在这里您返回，而不是再次递归。这可以像if语句一样简单，也可以更复杂。这也是有道理的。您现在拥有它的方式，很明显为什么它会不断递归，您永远不会告诉它不这样做。

相关问题
最新问题