4 examples of 'merge two arrays in python' in Python

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def _merge_python_type(A, B):
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    a = _merge_order[A]
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    b = _merge_order[B]
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    if a >= b:
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        output = A
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    else:
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        output = B
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    if isinstance(output, str):
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        return output
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    else:
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        return output.__name__

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def merge(a, b):
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    for key in b:
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        if key in a:
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            if isinstance(a[key], dict) and isinstance(b[key], dict):
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                merge(a[key], b[key])
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        else:
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            a[key] = b[key]
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    return a

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def data_merge(obj_a, obj_b):
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    """merges obj_b into obj_a and return merged result
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    Args:
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        obj_a (dict) The "merge into dict"
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        obj_b (dict) The "merge from dict"
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    Returns:
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        dict:  The obj_a with obj_b added to it
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    """
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    key = None
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    try:
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        if obj_a is None or isinstance(obj_a, (str, unicode, int, long, float)):
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            # border case for first run or if a is a primitive
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            obj_a = obj_b
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        elif isinstance(obj_a, list):
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            # lists can be only appended
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            if isinstance(obj_b, list):
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                # merge lists
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                obj_a.extend(obj_b)
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            else:
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                # append to list
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                obj_a.append(obj_b)
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        elif isinstance(obj_a, dict):
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            # dicts must be merged
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            if isinstance(obj_b, dict):
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                for key in obj_b:
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                    if key in obj_a:
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                        obj_a[key] = data_merge(obj_a[key], obj_b[key])
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                    else:
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                        obj_a[key] = obj_b[key]
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            else:
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                raise 'Cannot merge non-dict "%s" into dict "%s"' % (obj_b, obj_a)
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        else:
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            raise 'NOT IMPLEMENTED "%s" into "%s"' % (obj_b, obj_a)
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    except TypeError, exc:
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        raise 'TypeError "%s" in key "%s" when merging "%s" into "%s"' % (exc, key, obj_b, obj_a)
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    return obj_a

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def _merge_a_into_b(a, b, stack=None):
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    """Merge config dictionary a into config dictionary b, clobbering the
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    options in b whenever they are also specified in a.
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    """
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    assert isinstance(a, AttributeDict) or isinstance(a, dict), 'Argument `a` must be an AttrDict'
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    assert isinstance(b, AttributeDict) or isinstance(a, dict), 'Argument `b` must be an AttrDict'
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    for k, v_ in a.items():
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        full_key = '.'.join(stack) + '.' + k if stack is not None else k
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        # a must specify keys that are in b
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        if k not in b:
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            # if is it more than second stack
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            if stack is not None:
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                b[k] = v_
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            else:
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                raise KeyError('Non-existent config key: {}'.format(full_key))
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        v = copy.deepcopy(v_)
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        v = _decode_cfg_value(v)
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        v = _check_and_coerce_cfg_value_type(v, b[k], k, full_key)
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        # Recursively merge dicts
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        b[k] = v