# pandas.concat

`pandas.``concat`(objs, axis=0, join='outer', join_axes=None, ignore_index=False, keys=None, levels=None, names=None, verify_integrity=False, copy=True)

  Concatenate pandas objects along a particular axis with optional set logic along the other axes. Can also add a layer of hierarchical indexing on the concatenation axis, which may be useful if the labels are the same (or overlapping) on the passed axis number

  Parameters:

  objs : a sequence or mapping of Series, DataFrame, or Panel objects

  > If a dict is passed, the sorted keys will be used as the keys argument, unless it is passed, in which case the values will be selected (see below). Any None objects will be dropped silently unless they are all None in which case a ValueError will be raised

  axis : {0, 1, ...}, default 0

  > The axis to concatenate along

  join : {‘inner’, ‘outer’}, default ‘outer’

  > How to handle indexes on other axis(es)

  join_axes : list of Index objects

  > Specific indexes to use for the other n - 1 axes instead of performing inner/outer set logic

  verify_integrity : boolean, default False

  > Check whether the new concatenated axis contains duplicates. This can be very expensive relative to the actual data concatenation

  keys : sequence, default None

  > If multiple levels passed, should contain tuples. Construct hierarchical index using the passed keys as the outermost level

  levels : list of sequences, default None

  > Specific levels (unique values) to use for constructing a MultiIndex. Otherwise they will be inferred from the keys

  names : list, default None

  > Names for the levels in the resulting hierarchical index

  ignore_index : boolean, default False

  > If True, do not use the index values along the concatenation axis. The resulting axis will be labeled 0, ..., n - 1. This is useful if you are concatenating objects where the concatenation axis does not have meaningful indexing information. Note the the index values on the other axes are still respected in the join.

  copy : boolean, default True

  > If False, do not copy data unnecessarily

  Returns: | concatenated : type of objects

  Notes

  The keys, levels, and names arguments are all optional