在Python中嵌套函数时是否有开销? [英] Is there an overhead when nesting functions in Python?
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问题描述
在Python中,如果我在父函数中有一个子函数,每次调用父函数时子函数是否被初始化(创建)?在另一个函数中嵌套函数是否有任何开销?
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 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。这可能不是一个问题,除非你有一个紧密的循环。分析会告诉你是否有问题。
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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