from __future__ import absolute_import, division, print_function
from builtins import range

import functools


ITERABLE_TYPES = (
    list,
    set,
    tuple,
)

try:
    from numpy import ndarray
    ITERABLE_TYPES = ITERABLE_TYPES + (ndarray,)
except ImportError:
    pass


def isiterable(v):
    return isinstance(v, ITERABLE_TYPES)


def batchable(func=None, batch_size=100):
    def do_batch(*args, **kwargs):
        _batch_size = kwargs.pop('batch_size', batch_size)
        if isiterable(args[0]):
            _self = None
            to_batch = args[0]
            args = args[1:]
        else:
            _self = args[0]
            to_batch = args[1]
            args = args[2:]
            if not isiterable(to_batch):
                to_batch = [to_batch]

        if isinstance(to_batch, set):
            to_batch = list(to_batch)

        for _batch in [
            to_batch[i:i+_batch_size]
            for i in range(0, len(to_batch), _batch_size)
        ]:
            if _self is None:
                func(_batch, *args, **kwargs)
            else:
                func(_self, _batch, *args, **kwargs)

    if func is None:
        return functools.partial(batchable, batch_size=batch_size)
    return do_batch

from __future__ import absolute_import, division, print_function
from builtins import range

import functools


ITERABLE_TYPES = (
    list,
    set,
    tuple,
)

MISSING_POSITIONAL_ERR = 'Required positional argument (pos 1) not found'

try:
    from numpy import ndarray
    ITERABLE_TYPES = ITERABLE_TYPES + (ndarray,)
except ImportError:
    pass


def isiterable(v):
    return isinstance(v, ITERABLE_TYPES)


def batchable(func=None, batch_size=100):
    def do_batch(*args, **kwargs):
        if len(args) == 0:
            raise TypeError(MISSING_POSITIONAL_ERR)
        _batch_size = kwargs.pop('batch_size', batch_size)

        if isiterable(args[0]):
            _self = None
            to_batch = args[0]
            args = args[1:]
        else:
            if len(args) == 1:
                raise TypeError(MISSING_POSITIONAL_ERR)
            _self = args[0]
            to_batch = args[1]
            args = args[2:]
            if not isiterable(to_batch):
                to_batch = [to_batch]

        if isinstance(to_batch, set):
            to_batch = list(to_batch)

        for _batch in [
            to_batch[i:i+_batch_size]
            for i in range(0, len(to_batch), _batch_size)
        ]:
            if _self is None:
                func(_batch, *args, **kwargs)
            else:
                func(_self, _batch, *args, **kwargs)

    if func is None:
        return functools.partial(batchable, batch_size=batch_size)
    return do_batch

Raise TypeError if positional batchable argument is missing
Raise TypeError if positional batchable argument is missing

e.g. if it's erroneously been passed as a named argument.
