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# pandas.DataFrame.reset_index

DataFrame.reset_index(level=None, *, drop=False, inplace=False, col_level=0, col_fill='', allow_duplicates=<no_default>, names=None)

  Reset the index, or a level of it.

  Reset the index of the DataFrame, and use the default one instead. If the DataFrame has a MultiIndex, this method can remove one or more levels.

  Parameters:
    level int, str, tuple, or list, default None

      Only remove the given levels from the index. Removes all levels by default.

    drop bool, default False

      Do not try to insert index into dataframe columns. This resets the index to the default integer index.

    inplace bool, default False

      Whether to modify the DataFrame rather than creating a new one.

    col_level int or str, default 0

      If the columns have multiple levels, determines which level the labels are inserted into. By default it is inserted into the first level.

    col_fill object, default ‘’

      If the columns have multiple levels, determines how the other levels are named. If None then the index name is repeated.

    allow_duplicates bool, optional, default lib.no_default

      Allow duplicate column labels to be created.

    names int, str or 1-dimensional list, default None

      Using the given string, rename the DataFrame column which contains the index data. If the DataFrame has a MultiIndex, this has to be a list with length equal to the number of levels.

  Returns:
    DataFrame or None

      DataFrame with the new index or None if `inplace=True`.

  See also

  `DataFrame.set_index`

    Opposite of reset_index.

  `DataFrame.reindex`

    Change to new indices or expand indices.

  `DataFrame.reindex_like`

    Change to same indices as other DataFrame.

  Examples

      >>> df = pd.DataFrame(
      ...     [("bird", 389.0), ("bird", 24.0), ("mammal", 80.5), ("mammal", np.nan)],
      ...     index=["falcon", "parrot", "lion", "monkey"],
      ...     columns=("class", "max_speed"),
      ... )
      >>> df
               class  max_speed
      falcon    bird      389.0
      parrot    bird       24.0
      lion    mammal       80.5
      monkey  mammal        NaN

  When we reset the index, the old index is added as a column, and a new sequential index is used:

      >>> df.reset_index()
          index   class  max_speed
      0  falcon    bird      389.0
      1  parrot    bird       24.0
      2    lion  mammal       80.5
      3  monkey  mammal        NaN

  We can use the drop parameter to avoid the old index being added as a column:

      >>> df.reset_index(drop=True)
          class  max_speed
      0    bird      389.0
      1    bird       24.0
      2  mammal       80.5
      3  mammal        NaN

  You can also use reset_index with MultiIndex.

      >>> index = pd.MultiIndex.from_tuples(
      ...     [
      ...         ("bird", "falcon"),
      ...         ("bird", "parrot"),
      ...         ("mammal", "lion"),
      ...         ("mammal", "monkey"),
      ...     ],
      ...     names=["class", "name"],
      ... )
      >>> columns = pd.MultiIndex.from_tuples([("speed", "max"), ("species", "type")])
      >>> df = pd.DataFrame(
      ...     [(389.0, "fly"), (24.0, "fly"), (80.5, "run"), (np.nan, "jump")],
      ...     index=index,
      ...     columns=columns,
      ... )
      >>> df
                     speed species
                       max    type
      class  name
      bird   falcon  389.0     fly
             parrot   24.0     fly
      mammal lion     80.5     run
             monkey    NaN    jump

  Using the names parameter, choose a name for the index column:

      >>> df.reset_index(names=["classes", "names"])
        classes   names  speed species
                           max    type
      0    bird  falcon  389.0     fly
      1    bird  parrot   24.0     fly
      2  mammal    lion   80.5     run
      3  mammal  monkey    NaN    jump

  If the index has multiple levels, we can reset a subset of them:

      >>> df.reset_index(level="class")
               class  speed species
                        max    type
      name
      falcon    bird  389.0     fly
      parrot    bird   24.0     fly
      lion    mammal   80.5     run
      monkey  mammal    NaN    jump

  If we are not dropping the index, by default, it is placed in the top level. We can place it in another level:

      >>> df.reset_index(level="class", col_level=1)
                      speed species
               class    max    type
      name
      falcon    bird  389.0     fly
      parrot    bird   24.0     fly
      lion    mammal   80.5     run
      monkey  mammal    NaN    jump

  When the index is inserted under another level, we can specify under which one with the parameter col_fill:

      >>> df.reset_index(level="class", col_level=1, col_fill="species")
                    species  speed species
                      class    max    type
      name
      falcon           bird  389.0     fly
      parrot           bird   24.0     fly
      lion           mammal   80.5     run
      monkey         mammal    NaN    jump

  If we specify a nonexistent level for col_fill, it is created:

      >>> df.reset_index(level="class", col_level=1, col_fill="genus")
                      genus  speed species
                      class    max    type
      name
      falcon           bird  389.0     fly
      parrot           bird   24.0     fly
      lion           mammal   80.5     run
      monkey         mammal    NaN    jump