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Indexing

Index

Many of these methods or variants thereof are available on the objects that contain an index (Series/DataFrame) and those should most likely be used before calling these methods directly.

Index Immutable ndarray implementing an ordered, sliceable set.

Properties

Index.values Return an array representing the data in the Index.
Index.is_monotonic Alias for is_monotonic_increasing.
Index.is_monotonic_increasing Return if the index is monotonic increasing (only equal or increasing) values.
Index.is_monotonic_decreasing Return if the index is monotonic decreasing (only equal or decreasing) values.
Index.is_unique Return if the index has unique values.
Index.has_duplicates
Index.hasnans Return if I have any nans; enables various perf speedups.
Index.dtype Return the dtype object of the underlying data.
Index.dtype_str Return the dtype str of the underlying data.
Index.inferred_type Return a string of the type inferred from the values.
Index.is_all_dates
Index.shape Return a tuple of the shape of the underlying data.
Index.name
Index.names
Index.nbytes Return the number of bytes in the underlying data.
Index.ndim Number of dimensions of the underlying data, by definition 1.
Index.size Return the number of elements in the underlying data.
Index.empty
Index.strides Return the strides of the underlying data.
Index.itemsize Return the size of the dtype of the item of the underlying data.
Index.base Return the base object if the memory of the underlying data is shared.
Index.T Return the transpose, which is by definition self.
Index.memory_usage([deep]) Memory usage of the values

Modifying and Computations

Index.all(*args, **kwargs) Return whether all elements are True.
Index.any(*args, **kwargs) Return whether any element is True.
Index.argmin([axis, skipna]) Return a ndarray of the minimum argument indexer.
Index.argmax([axis, skipna]) Return a ndarray of the maximum argument indexer.
Index.copy([name, deep, dtype]) Make a copy of this object.
Index.delete(loc) Make new Index with passed location(-s) deleted.
Index.drop(labels[, errors]) Make new Index with passed list of labels deleted.
Index.drop_duplicates([keep]) Return Index with duplicate values removed.
Index.duplicated([keep]) Indicate duplicate index values.
Index.equals(other) Determines if two Index objects contain the same elements.
Index.factorize([sort, na_sentinel]) Encode the object as an enumerated type or categorical variable.
Index.identical(other) Similar to equals, but check that other comparable attributes are also equal.
Index.insert(loc, item) Make new Index inserting new item at location.
Index.is_(other) More flexible, faster check like is but that works through views.
Index.is_boolean()
Index.is_categorical() Check if the Index holds categorical data.
Index.is_floating()
Index.is_integer()
Index.is_interval()
Index.is_mixed()
Index.is_numeric()
Index.is_object()
Index.min([axis, skipna]) Return the minimum value of the Index.
Index.max([axis, skipna]) Return the maximum value of the Index.
Index.reindex(target[, method, level, …]) Create index with target’s values (move/add/delete values as necessary).
Index.rename(name[, inplace]) Alter Index or MultiIndex name.
Index.repeat(repeats[, axis]) Repeat elements of a Index.
Index.where(cond[, other]) Return an Index of same shape as self and whose corresponding entries are from self where cond is True and otherwise are from other.
Index.take(indices[, axis, allow_fill, …]) Return a new Index of the values selected by the indices.
Index.putmask(mask, value) Return a new Index of the values set with the mask.
Index.unique([level]) Return unique values in the index.
Index.nunique([dropna]) Return number of unique elements in the object.
Index.value_counts([normalize, sort, …]) Return a Series containing counts of unique values.

Compatibility with MultiIndex

Index.set_names(names[, level, inplace]) Set Index or MultiIndex name.
Index.is_lexsorted_for_tuple(tup)
Index.droplevel([level]) Return index with requested level(s) removed.

Missing Values

Index.fillna([value, downcast]) Fill NA/NaN values with the specified value
Index.dropna([how]) Return Index without NA/NaN values
Index.isna() Detect missing values.
Index.notna() Detect existing (non-missing) values.

Conversion

Index.astype(dtype[, copy]) Create an Index with values cast to dtypes.
Index.item() Return the first element of the underlying data as a python scalar.
Index.map(mapper[, na_action]) Map values using input correspondence (a dict, Series, or function).
Index.ravel([order]) Return an ndarray of the flattened values of the underlying data.
Index.to_list() Return a list of the values.
Index.to_native_types([slicer]) Format specified values of self and return them.
Index.to_series([index, name]) Create a Series with both index and values equal to the index keys useful with map for returning an indexer based on an index.
Index.to_frame([index, name]) Create a DataFrame with a column containing the Index.
Index.view([cls])

Sorting

Index.argsort(*args, **kwargs) Return the integer indices that would sort the index.
Index.searchsorted(value[, side, sorter]) Find indices where elements should be inserted to maintain order.
Index.sort_values([return_indexer, ascending]) Return a sorted copy of the index.

Time-specific operations

Index.shift([periods, freq]) Shift index by desired number of time frequency increments.

Combining / joining / set operations

Index.append(other) Append a collection of Index options together.
Index.join(other[, how, level, …]) Compute join_index and indexers to conform data structures to the new index.
Index.intersection(other[, sort]) Form the intersection of two Index objects.
Index.union(other[, sort]) Form the union of two Index objects.
Index.difference(other[, sort]) Return a new Index with elements from the index that are not in other.
Index.symmetric_difference(other[, …]) Compute the symmetric difference of two Index objects.

Selecting

Index.asof(label) Return the label from the index, or, if not present, the previous one.
Index.asof_locs(where, mask) Finds the locations (indices) of the labels from the index for every entry in the where argument.
Index.contains(key) Return a boolean indicating whether the provided key is in the index.
Index.get_duplicates() (DEPRECATED) Extract duplicated index elements.
Index.get_indexer(target[, method, limit, …]) Compute indexer and mask for new index given the current index.
Index.get_indexer_for(target, **kwargs) Guaranteed return of an indexer even when non-unique.
Index.get_indexer_non_unique(target) Compute indexer and mask for new index given the current index.
Index.get_level_values(level) Return an Index of values for requested level.
Index.get_loc(key[, method, tolerance]) Get integer location, slice or boolean mask for requested label.
Index.get_slice_bound(label, side, kind) Calculate slice bound that corresponds to given label.
Index.get_value(series, key) Fast lookup of value from 1-dimensional ndarray.
Index.get_values() Return Index data as an numpy.ndarray.
Index.set_value(arr, key, value) Fast lookup of value from 1-dimensional ndarray.
Index.isin(values[, level]) Return a boolean array where the index values are in values.
Index.slice_indexer([start, end, step, kind]) For an ordered or unique index, compute the slice indexer for input labels and step.
Index.slice_locs([start, end, step, kind]) Compute slice locations for input labels.

Numeric Index

RangeIndex Immutable Index implementing a monotonic integer range.
Int64Index Immutable ndarray implementing an ordered, sliceable set.
UInt64Index Immutable ndarray implementing an ordered, sliceable set.
Float64Index Immutable ndarray implementing an ordered, sliceable set.
RangeIndex.from_range(data[, name, dtype]) Create RangeIndex from a range (py3), or xrange (py2) object.

CategoricalIndex

CategoricalIndex Immutable Index implementing an ordered, sliceable set.

Categorical Components

CategoricalIndex.codes
CategoricalIndex.categories
CategoricalIndex.ordered
CategoricalIndex.rename_categories(*args, …) Renames categories.
CategoricalIndex.reorder_categories(*args, …) Reorders categories as specified in new_categories.
CategoricalIndex.add_categories(*args, **kwargs) Add new categories.
CategoricalIndex.remove_categories(*args, …) Removes the specified categories.
CategoricalIndex.remove_unused_categories(…) Removes categories which are not used.
CategoricalIndex.set_categories(*args, **kwargs) Sets the categories to the specified new_categories.
CategoricalIndex.as_ordered(*args, **kwargs) Set the Categorical to be ordered.
CategoricalIndex.as_unordered(*args, **kwargs) Set the Categorical to be unordered.

Modifying and Computations

CategoricalIndex.map(mapper) Map values using input correspondence (a dict, Series, or function).
CategoricalIndex.equals(other) Determines if two CategorialIndex objects contain the same elements.

IntervalIndex

IntervalIndex Immutable index of intervals that are closed on the same side.

IntervalIndex Components

IntervalIndex.from_arrays(left, right[, …]) Construct from two arrays defining the left and right bounds.
IntervalIndex.from_tuples(data[, closed, …]) Construct an IntervalIndex from an array-like of tuples
IntervalIndex.from_breaks(breaks[, closed, …]) Construct an IntervalIndex from an array of splits.
IntervalIndex.contains(key) Return a boolean indicating if the key is IN the index
IntervalIndex.left Return the left endpoints of each Interval in the IntervalIndex as an Index
IntervalIndex.right Return the right endpoints of each Interval in the IntervalIndex as an Index
IntervalIndex.mid Return the midpoint of each Interval in the IntervalIndex as an Index
IntervalIndex.closed Whether the intervals are closed on the left-side, right-side, both or neither
IntervalIndex.length Return an Index with entries denoting the length of each Interval in the IntervalIndex
IntervalIndex.values Return the IntervalIndex’s data as an IntervalArray.
IntervalIndex.is_non_overlapping_monotonic Return True if the IntervalIndex is non-overlapping (no Intervals share points) and is either monotonic increasing or monotonic decreasing, else False
IntervalIndex.is_overlapping Return True if the IntervalIndex has overlapping intervals, else False.
IntervalIndex.get_loc(key[, method]) Get integer location, slice or boolean mask for requested label.
IntervalIndex.get_indexer(target[, method, …]) Compute indexer and mask for new index given the current index.
IntervalIndex.set_closed(closed) Return an IntervalIndex identical to the current one, but closed on the specified side
IntervalIndex.overlaps(other) Check elementwise if an Interval overlaps the values in the IntervalIndex.
IntervalIndex.to_tuples([na_tuple]) Return an Index of tuples of the form (left, right)

MultiIndex

MultiIndex A multi-level, or hierarchical, index object for pandas objects.
IndexSlice Create an object to more easily perform multi-index slicing

MultiIndex Constructors

MultiIndex.from_arrays(arrays[, sortorder, …]) Convert arrays to MultiIndex.
MultiIndex.from_tuples(tuples[, sortorder, …]) Convert list of tuples to MultiIndex.
MultiIndex.from_product(iterables[, …]) Make a MultiIndex from the cartesian product of multiple iterables.
MultiIndex.from_frame(df[, sortorder, names]) Make a MultiIndex from a DataFrame.

MultiIndex Properties

MultiIndex.names Names of levels in MultiIndex
MultiIndex.levels
MultiIndex.codes
MultiIndex.nlevels Integer number of levels in this MultiIndex.
MultiIndex.levshape A tuple with the length of each level.

MultiIndex Components

MultiIndex.set_levels(levels[, level, …]) Set new levels on MultiIndex.
MultiIndex.set_codes(codes[, level, …]) Set new codes on MultiIndex.
MultiIndex.to_hierarchical(n_repeat[, n_shuffle]) (DEPRECATED) Return a MultiIndex reshaped to conform to the shapes given by n_repeat and n_shuffle.
MultiIndex.to_flat_index() Convert a MultiIndex to an Index of Tuples containing the level values.
MultiIndex.to_frame([index, name]) Create a DataFrame with the levels of the MultiIndex as columns.
MultiIndex.is_lexsorted() Return True if the codes are lexicographically sorted
MultiIndex.sortlevel([level, ascending, …]) Sort MultiIndex at the requested level.
MultiIndex.droplevel([level]) Return index with requested level(s) removed.
MultiIndex.swaplevel([i, j]) Swap level i with level j.
MultiIndex.reorder_levels(order) Rearrange levels using input order.
MultiIndex.remove_unused_levels() Create a new MultiIndex from the current that removes unused levels, meaning that they are not expressed in the labels.

MultiIndex Selecting

MultiIndex.get_loc(key[, method]) Get location for a label or a tuple of labels as an integer, slice or boolean mask.
MultiIndex.get_loc_level(key[, level, …]) Get both the location for the requested label(s) and the resulting sliced index.
MultiIndex.get_indexer(target[, method, …]) Compute indexer and mask for new index given the current index.
MultiIndex.get_level_values(level) Return vector of label values for requested level, equal to the length of the index.

DatetimeIndex

DatetimeIndex Immutable ndarray of datetime64 data, represented internally as int64, and which can be boxed to Timestamp objects that are subclasses of datetime and carry metadata such as frequency information.

Time/Date Components

DatetimeIndex.year The year of the datetime.
DatetimeIndex.month The month as January=1, December=12.
DatetimeIndex.day The days of the datetime.
DatetimeIndex.hour The hours of the datetime.
DatetimeIndex.minute The minutes of the datetime.
DatetimeIndex.second The seconds of the datetime.
DatetimeIndex.microsecond The microseconds of the datetime.
DatetimeIndex.nanosecond The nanoseconds of the datetime.
DatetimeIndex.date Returns numpy array of python datetime.date objects (namely, the date part of Timestamps without timezone information).
DatetimeIndex.time Returns numpy array of datetime.time.
DatetimeIndex.timetz Returns numpy array of datetime.time also containing timezone information.
DatetimeIndex.dayofyear The ordinal day of the year.
DatetimeIndex.weekofyear The week ordinal of the year.
DatetimeIndex.week The week ordinal of the year.
DatetimeIndex.dayofweek The day of the week with Monday=0, Sunday=6.
DatetimeIndex.weekday The day of the week with Monday=0, Sunday=6.
DatetimeIndex.quarter The quarter of the date.
DatetimeIndex.tz
DatetimeIndex.freq Return the frequency object if it is set, otherwise None.
DatetimeIndex.freqstr Return the frequency object as a string if it is set, otherwise None.
DatetimeIndex.is_month_start Indicates whether the date is the first day of the month.
DatetimeIndex.is_month_end Indicates whether the date is the last day of the month.
DatetimeIndex.is_quarter_start Indicator for whether the date is the first day of a quarter.
DatetimeIndex.is_quarter_end Indicator for whether the date is the last day of a quarter.
DatetimeIndex.is_year_start Indicate whether the date is the first day of a year.
DatetimeIndex.is_year_end Indicate whether the date is the last day of the year.
DatetimeIndex.is_leap_year Boolean indicator if the date belongs to a leap year.
DatetimeIndex.inferred_freq Tryies to return a string representing a frequency guess, generated by infer_freq.

Selecting

DatetimeIndex.indexer_at_time(time[, asof]) Returns index locations of index values at particular time of day (e.g.
DatetimeIndex.indexer_between_time(…[, …]) Return index locations of values between particular times of day (e.g., 9:00-9:30AM).

Time-specific operations

DatetimeIndex.normalize(*args, **kwargs) Convert times to midnight.
DatetimeIndex.strftime(*args, **kwargs) Convert to Index using specified date_format.
DatetimeIndex.snap([freq]) Snap time stamps to nearest occurring frequency
DatetimeIndex.tz_convert(*args, **kwargs) Convert tz-aware Datetime Array/Index from one time zone to another.
DatetimeIndex.tz_localize(*args, **kwargs) Localize tz-naive Datetime Array/Index to tz-aware Datetime Array/Index.
DatetimeIndex.round(*args, **kwargs) Perform round operation on the data to the specified freq.
DatetimeIndex.floor(*args, **kwargs) Perform floor operation on the data to the specified freq.
DatetimeIndex.ceil(*args, **kwargs) Perform ceil operation on the data to the specified freq.
DatetimeIndex.month_name(*args, **kwargs) Return the month names of the DateTimeIndex with specified locale.
DatetimeIndex.day_name(*args, **kwargs) Return the day names of the DateTimeIndex with specified locale.

Conversion

DatetimeIndex.to_period(*args, **kwargs) Cast to PeriodArray/Index at a particular frequency.
DatetimeIndex.to_perioddelta(*args, **kwargs) Calculate TimedeltaArray of difference between index values and index converted to PeriodArray at specified freq.
DatetimeIndex.to_pydatetime(*args, **kwargs) Return Datetime Array/Index as object ndarray of datetime.datetime objects
DatetimeIndex.to_series([keep_tz, index, name]) Create a Series with both index and values equal to the index keys useful with map for returning an indexer based on an index
DatetimeIndex.to_frame([index, name]) Create a DataFrame with a column containing the Index.

TimedeltaIndex

TimedeltaIndex Immutable ndarray of timedelta64 data, represented internally as int64, and which can be boxed to timedelta objects

Components

TimedeltaIndex.days Number of days for each element.
TimedeltaIndex.seconds Number of seconds (>= 0 and less than 1 day) for each element.
TimedeltaIndex.microseconds Number of microseconds (>= 0 and less than 1 second) for each element.
TimedeltaIndex.nanoseconds Number of nanoseconds (>= 0 and less than 1 microsecond) for each element.
TimedeltaIndex.components Return a dataframe of the components (days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds) of the Timedeltas.
TimedeltaIndex.inferred_freq Tryies to return a string representing a frequency guess, generated by infer_freq.

Conversion

TimedeltaIndex.to_pytimedelta(*args, **kwargs) Return Timedelta Array/Index as object ndarray of datetime.timedelta objects.
TimedeltaIndex.to_series([index, name]) Create a Series with both index and values equal to the index keys useful with map for returning an indexer based on an index.
TimedeltaIndex.round(freq[, ambiguous, …]) Perform round operation on the data to the specified freq.
TimedeltaIndex.floor(freq[, ambiguous, …]) Perform floor operation on the data to the specified freq.
TimedeltaIndex.ceil(freq[, ambiguous, …]) Perform ceil operation on the data to the specified freq.
TimedeltaIndex.to_frame([index, name]) Create a DataFrame with a column containing the Index.

PeriodIndex

PeriodIndex Immutable ndarray holding ordinal values indicating regular periods in time such as particular years, quarters, months, etc.

Properties

PeriodIndex.day The days of the period
PeriodIndex.dayofweek The day of the week with Monday=0, Sunday=6
PeriodIndex.dayofyear The ordinal day of the year
PeriodIndex.days_in_month The number of days in the month
PeriodIndex.daysinmonth The number of days in the month
PeriodIndex.end_time
PeriodIndex.freq Return the frequency object if it is set, otherwise None.
PeriodIndex.freqstr Return the frequency object as a string if it is set, otherwise None.
PeriodIndex.hour The hour of the period
PeriodIndex.is_leap_year Logical indicating if the date belongs to a leap year
PeriodIndex.minute The minute of the period
PeriodIndex.month The month as January=1, December=12
PeriodIndex.quarter The quarter of the date
PeriodIndex.qyear
PeriodIndex.second The second of the period
PeriodIndex.start_time
PeriodIndex.week The week ordinal of the year
PeriodIndex.weekday The day of the week with Monday=0, Sunday=6
PeriodIndex.weekofyear The week ordinal of the year
PeriodIndex.year The year of the period

Methods

PeriodIndex.asfreq(*args, **kwargs) Convert the Period Array/Index to the specified frequency freq.
PeriodIndex.strftime(*args, **kwargs) Convert to Index using specified date_format.
PeriodIndex.to_timestamp(*args, **kwargs) Cast to DatetimeArray/Index.
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