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# pandas.DataFrame.compare

DataFrame.compare(other, align_axis=1, keep_shape=False, keep_equal=False, result_names=('self', 'other'))

  Compare to another DataFrame and show the differences.

  Parameters:
    other DataFrame

      Object to compare with.

    align_axis{0 or ‘index’, 1 or ‘columns’}, default 1

      Determine which axis to align the comparison on.

      - 0, or ‘index’ : Resulting differences are stacked vertically with rows drawn alternately from self and other.

      - 1, or ‘columns’ : Resulting differences are aligned horizontally with columns drawn alternately from self and other.

    keep_shape bool, default False

      If true, all rows and columns are kept. Otherwise, only the ones with different values are kept.

    keep_equal bool, default False

      If true, the result keeps values that are equal. Otherwise, equal values are shown as NaNs.

    result_names tuple, default (‘self’, ‘other’)

      Set the dataframes names in the comparison.

  Returns:
    DataFrame

      DataFrame that shows the differences stacked side by side.

      The resulting index will be a MultiIndex with ‘self’ and ‘other’ stacked alternately at the inner level.

  Raises:
    ValueError

      When the two DataFrames don’t have identical labels or shape.

  See also

  `Series.compare`

    Compare with another Series and show differences.

  `DataFrame.equals`

    Test whether two objects contain the same elements.

  Notes

  Matching NaNs will not appear as a difference.

  Can only compare identically-labeled (i.e. same shape, identical row and column labels) DataFrames

  Examples

      >>> df = pd.DataFrame(
      ...     {
      ...         "col1": ["a", "a", "b", "b", "a"],
      ...         "col2": [1.0, 2.0, 3.0, np.nan, 5.0],
      ...         "col3": [1.0, 2.0, 3.0, 4.0, 5.0],
      ...     },
      ...     columns=["col1", "col2", "col3"],
      ... )
      >>> df
        col1  col2  col3
      0    a   1.0   1.0
      1    a   2.0   2.0
      2    b   3.0   3.0
      3    b   NaN   4.0
      4    a   5.0   5.0

      >>> df2 = df.copy()
      >>> df2.loc[0, "col1"] = "c"
      >>> df2.loc[2, "col3"] = 4.0
      >>> df2
        col1  col2  col3
      0    c   1.0   1.0
      1    a   2.0   2.0
      2    b   3.0   4.0
      3    b   NaN   4.0
      4    a   5.0   5.0

  Align the differences on columns

      >>> df.compare(df2)
        col1       col3
        self other self other
      0    a     c  NaN   NaN
      2  NaN   NaN  3.0   4.0

  Assign result_names

      >>> df.compare(df2, result_names=("left", "right"))
        col1       col3
        left right left right
      0    a     c  NaN   NaN
      2  NaN   NaN  3.0   4.0

  Stack the differences on rows

      >>> df.compare(df2, align_axis=0)
              col1  col3
      0 self     a   NaN
        other    c   NaN
      2 self   NaN   3.0
        other  NaN   4.0

  Keep the equal values

      >>> df.compare(df2, keep_equal=True)
        col1       col3
        self other self other
      0    a     c  1.0   1.0
      2    b     b  3.0   4.0

  Keep all original rows and columns

      >>> df.compare(df2, keep_shape=True)
        col1       col2       col3
        self other self other self other
      0    a     c  NaN   NaN  NaN   NaN
      1  NaN   NaN  NaN   NaN  NaN   NaN
      2  NaN   NaN  NaN   NaN  3.0   4.0
      3  NaN   NaN  NaN   NaN  NaN   NaN
      4  NaN   NaN  NaN   NaN  NaN   NaN

  Keep all original rows and columns and also all original values

      >>> df.compare(df2, keep_shape=True, keep_equal=True)
        col1       col2       col3
        self other self other self other
      0    a     c  1.0   1.0  1.0   1.0
      1    a     a  2.0   2.0  2.0   2.0
      2    b     b  3.0   3.0  3.0   4.0
      3    b     b  NaN   NaN  4.0   4.0
      4    a     a  5.0   5.0  5.0   5.0