Is it pythonic: naming lambdas

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This is not Pythonic and PEP8 discourages it:

Always use a def statement instead of an assignment statement that
binds a lambda expression directly to an identifier.

Yes:

def f(x): return 2*x

No:

f = lambda x: 2*x

The first form means that the name of the resulting function object is
specifically 'f' instead of the generic '<lambda>'. This is more
useful for tracebacks and string representations in general. The use
of the assignment statement eliminates the sole benefit a lambda
expression can offer over an explicit def statement (i.e. that it can
be embedded inside a larger expression)

A rule of thumb for this is to think on its definition: lambdas expressions are anonymous functions. If you name it, it isn’t anonymous anymore. 🙂

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