在 Python 中嵌套函数时是否有开销? [英] Is there an overhead when nesting functions in Python?

问题描述

在 Python 中，如果我在父函数中有一个子函数，那么子函数是初始化的"吗?(创建)每次调用父函数时?将一个函数嵌套在另一个函数中是否会产生任何性能开销?

In Python, if I have a child function within a parent function, is the child function "initialised" (created) every time the parent function is called? Is there any performance overhead associated with nesting a function within another?

推荐答案

是的，每次都会创建一个新对象.除非你把它放在一个紧密的循环中，否则这可能不是问题.分析会告诉您这是否有问题.

Yes, a new object would be created each time. It's likely not an issue unless you have it in a tight loop. Profiling will tell you if it's a problem.

In [80]: def foo():
   ....:     def bar():
   ....:         pass
   ....:     return bar
   ....: 

In [81]: id(foo())
Out[81]: 29654024

In [82]: id(foo())
Out[82]: 29651384

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