9 examples of 'how to merge two list in python' in Python

181
def mergeList(list_of_list):
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	return list(itertools.chain.from_iterable(list_of_list))

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def merge_lists(list_1, list_2, key, replace=False):
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    merged = {}
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    for item in list_1 + list_2:
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        item_key = item[key]
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        if item_key in merged:
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            if replace:
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                merged[item_key].update(item)
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            else:
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                merged[item_key].update(
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                    item.items() + merged[item_key].items()
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                )
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        else:
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            merged[item_key] = item
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    return merged.values()

290
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__

15
def merge(lh,rh):
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    res = []
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    i = 0
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    j = 0
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    while i

8
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

18
def merge_list_dicts(list_dicts):
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    z = list_dicts[0].copy()   # start with x's keys and values
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    for i in range(1, len(list_dicts)):
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        z.update(list_dicts[i])  # modifies z with y's keys and values & returns None
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    return z

17
def _merge_dict(dict_1, dict_2):
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    new_dict = {}
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    for key in dict_1.keys():
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        if isinstance(dict_1[key], list):
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            new_dict[key] = dict_1[key]
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        else:
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            new_dict[key] = [dict_1[key]]
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    for key in dict_2.keys():
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        if key in new_dict:
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            if isinstance(dict_2[key], list):
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                new_dict[key].extend(dict_2[key])
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            else:
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                new_dict[key].append(dict_2[key])
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        else:
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            if isinstance(dict_2[key], list):
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                new_dict[key] = dict_2[key]
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            else:
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                new_dict[key] = [dict_2[key]]
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    return new_dict

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def mergeTwoLists2(self, l1, l2):
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    """
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    :param l1:
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    :param l2:
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    :return:
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    recursively
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    """
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    if not l1 or not l2:
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        return l1 or l2
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    if l1.val < l2.val:
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        l1.next = self.mergeTwoLists(l1.next, l2)
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        return l1
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    else:
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        l2.next = self.mergeTwoLists(l1, l2.next)
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        return l2

24
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