Can lambda expression has multiple lines in Python? Like common functions.
Can I do something like that?
res = lambda x y:
z = x**2 + 5
z + x + y
(I know that this function can be written on one line, It's an example)
3 Answers
They can be split across multiple lines by the same rule that any expression can be split across multiple lines. You can use backslash \ to prevent a linebreak ending the current statement, or use the fact that linebreaks are permitted within the various forms of brackets: (), [], {}.
However, a lambda expression is just that, an expression. It cannot contain assignment statements (or any other statements).
The precise details are defined by the Python grammar.
Comments
IMHO , you can't.
If you need some temporary variable in a lambda function, as a ugly workaround you can do :
res = lambda x,y : [ z**2 + z**4 + z for z in [x**2+5]][0]
Comments
For an interesting example of how far you can take lambda expressions check this out.
Although you should absolutely use a function for this.
1 Comment
chepner
This outputs to standard output and returns
[None].
def.lambdafunction is that it can be define in-line. If you want to use a multi line function you can simply use regular functions withdef.