Can someone give me a short explanation?
Daniel Dittmar
daniel.dittmar at sap.com
Mon Apr 5 05:30:19 EDT 2004
Senthoorkumaran Punniamoorthy wrote:
> I found this code in the book text processing with Python. But having
> little difficulty understanding how exactly it works and what should
> be passed as argument? Can someone decode this for me please?
>
> apply_each = lambda fns, args=[]: map(apply, fns, [args]*len(fns))
def apply_each (fns, args = []):
return map (apply, fns, [args]*len(fns))
map(...)
map(function, sequence[, sequence, ...]) -> list
Return a list of the results of applying the function to the items of
the argument sequence(s). If more than one sequence is given, the
function is called with an argument list consisting of the corresponding
item of each sequence, substituting None for missing values when not all
sequences have the same length. If the function is None, return a list
of
the items of the sequence (or a list of tuples if more than one
sequence).
so apply_each ([func1, func2, func3], [arg1, arg2])
is the same as
[func1 (arg1, arg2), func2 (arg1, arg2), func3 (arg1, arg)]
or using list comprehension
[func (arg1, arg2) for func in [func1, func2, func3])
Daniel
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