[Python-Dev] itertools.chain should take an iterable ? (original) (raw)

Jack Diederich jack at performancedrivers.com
Thu Sep 1 19:35:19 CEST 2005

On Thu, Sep 01, 2005 at 07:58:40PM +0200, Paolino wrote:

Working on a tree library I've found myself writing itertools.chain(*[child.method() for child in self]). Well this happened after I tried instinctively itertools.chain(child.method() for child in self).

Is there a reason for this signature ?

This is more suited to comp.lang.python

Consider the below examples (and remember that strings are iterable)

import itertools as it list(it.chain('ABC', 'XYZ')) ['A', 'B', 'C', 'X', 'Y', 'Z'] list(it.chain(['ABC', 'XYZ'])) ['ABC', 'XYZ'] list(it.chain(['ABC'], ['XYZ'])) ['ABC', 'XYZ']

Hope that helps,

-jackdied

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