拉姆达 [英] lambda
问题描述
为什么用lambda表单创建的函数不能包含语句？
如何用语句获取未命名的函数？
why functions created with lambda forms cannot contain statements?
how to get unnamed function with statements?
推荐答案
Egor Bolonev写道：
Egor Bolonev wrote:
为什么用lambda表创建的函数不能包含语句？
语法/技术答案：因为lambda是一个表达式并且它不是很明显如何表达''语句内部''的语法应该是
''Python是完美的''答案：如果一个函数包含的表达式多于一个
，那么它的复杂程度足以要求一个名称
如何使用语句获取未命名的函数？
why functions created with lambda forms cannot contain statements?
syntax/technical answer: because lambda is an expression and it is not
obvious how the syntax for ''statement inside expression'' should be
''Python is perfect'' answer: if a function contains more than an
expression, then it''s complex enough to require a name
how to get unnamed function with statements?
你不能。查看有关Smalltalk / Ruby-like块的各种主题以及
最新的关于''where''关键字的建议，以便更改此建议
Daniel
You can''t. See various threads about Smalltalk/Ruby-like blocks and the
recent one about the ''where'' keyword for proposals to change this
Daniel
因为如果需要多行，则需要一个名称。另外，
如果你在这个函数中有多行，你打算怎么计划
如果没有名字引用它？
Tim
2005年1月13日星期四20:53:09 +1000，Egor Bolonev< eb ****** @ mail.ru>写道：
Because if it takes more than a single line it deserves a name. Also,
if you have more than one line in this function, how do you plan to
reference it if not by name?
Tim
On Thu, 13 Jan 2005 20:53:09 +1000, Egor Bolonev <eb******@mail.ru> wrote:
为什么用lambda表单创建的函数不能包含语句？
如何用语句获取未命名的函数？
-
http://mail.python.org/mailman/listinfo/python-list
why functions created with lambda forms cannot contain statements?
how to get unnamed function with statements?
--
http://mail.python.org/mailman/listinfo/python-list
Op 2005-01-13，Tim Leslie schreef< ti ******** @ gmail.com>：
Op 2005-01-13, Tim Leslie schreef <ti********@gmail.com>:
因为如果它需要一行以上就需要一个名字。
Because if it takes more than a single line it deserves a name.
所以，如果我的呼叫表达式超过
一行，我应该将表达式赋值给一个变量，并且
在调用中使用变量？
但是如果我这样做的话那个，人们会告诉我它有多糟糕，因为它会保留对b / b
将阻止垃圾收集器收获的价值的参考
内存。
除了python允许在同一行上有多个语句。
-
Antoon Pardon
So if I have a call with an expression that takes more than
one line, I should assign the expression to a variable and
use the variable in the call?
But wait if I do that, people will tell me how bad that it
is, because it will keep a reference to the value which
will prevent the garbage collector from harvesting this
memory.
Besides python allows more than one statement on the same line.
--
Antoon Pardon
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