pandas.Index

class pandas.Index [source]

Immutable ndarray implementing an ordered, sliceable set. The basic object storing axis labels for all pandas objects

Parameters:	data : array-like (1-dimensional) dtype : NumPy dtype (default: object) copy : bool Make a copy of input ndarray name : object Name to be stored in the index tupleize_cols : bool (default: True) When True, attempt to create a MultiIndex if possible

See also

RangeIndex

Index implementing a monotonic integer range

CategoricalIndex

Index of Categorical s.

MultiIndex

A multi-level, or hierarchical, Index

IntervalIndex

an Index of Interval s.

DatetimeIndex, TimedeltaIndex, PeriodIndex, Int64Index, UInt64Index, Float64Index

Notes

An Index instance can only contain hashable objects

Examples

>>> pd.Index([1, 2, 3])
Int64Index([1, 2, 3], dtype='int64')

>>> pd.Index(list('abc'))
Index(['a', 'b', 'c'], dtype='object')

Attributes

T	return the transpose, which is by definition self
asi8
base	return the base object if the memory of the underlying data is
data	return the data pointer of the underlying data
dtype
dtype_str
empty
flags
has_duplicates
hasnans
inferred_type
is_all_dates
is_monotonic	alias for is_monotonic_increasing (deprecated)
is_monotonic_decreasing	return if the index is monotonic decreasing (only equal or
is_monotonic_increasing	return if the index is monotonic increasing (only equal or
is_unique
itemsize	return the size of the dtype of the item of the underlying data
name
names
nbytes	return the number of bytes in the underlying data
ndim	return the number of dimensions of the underlying data,
nlevels
shape	return a tuple of the shape of the underlying data
size	return the number of elements in the underlying data
strides	return the strides of the underlying data
values	return the underlying data as an ndarray

Methods

all(*args, **kwargs)	Return whether all elements are True
any(*args, **kwargs)	Return whether any element is True
append(other)	Append a collection of Index options together
argmax([axis])	return a ndarray of the maximum argument indexer
argmin([axis])	return a ndarray of the minimum argument indexer
argsort(*args, **kwargs)	Returns the indices that would sort the index and its underlying data.
asof(label)	For a sorted index, return the most recent label up to and including the passed label.
asof_locs(where, mask)	where : array of timestamps
astype(dtype[, copy])	Create an Index with values cast to dtypes.
contains(key)	return a boolean if this key is IN the index
copy([name, deep, dtype])	Make a copy of this object.
delete(loc)	Make new Index with passed location(-s) deleted
difference(other)	Return a new Index with elements from the index that are not in other.
drop(labels[, errors])	Make new Index with passed list of labels deleted
drop_duplicates([keep])	Return Index with duplicate values removed
dropna([how])	Return Index without NA/NaN values
duplicated([keep])	Return boolean np.ndarray denoting duplicate values
equals(other)	Determines if two Index objects contain the same elements.
factorize([sort, na_sentinel])	Encode the object as an enumerated type or categorical variable
fillna([value, downcast])	Fill NA/NaN values with the specified value
format([name, formatter])	Render a string representation of the Index
get_duplicates()
get_indexer(target[, method, limit, tolerance])	Compute indexer and mask for new index given the current index.
get_indexer_for(target, **kwargs)	guaranteed return of an indexer even when non-unique
get_indexer_non_unique(target)	Compute indexer and mask for new index given the current index.
get_level_values(level)	Return an Index of values for requested level, equal to the length of the index.
get_loc(key[, method, tolerance])	Get integer location, slice or boolean mask for requested label.
get_slice_bound(label, side, kind)	Calculate slice bound that corresponds to given label.
get_value(series, key)	Fast lookup of value from 1-dimensional ndarray.
get_values()	return the underlying data as an ndarray
groupby(values)	Group the index labels by a given array of values.
holds_integer()
identical(other)	Similar to equals, but check that other comparable attributes are
insert(loc, item)	Make new Index inserting new item at location.
intersection(other)	Form the intersection of two Index objects.
is_(other)	More flexible, faster check like is but that works through views
is_boolean()
is_categorical()
is_floating()
is_integer()
is_interval()
is_lexsorted_for_tuple(tup)
is_mixed()
is_numeric()
is_object()
is_type_compatible(kind)
isin(values[, level])	Compute boolean array of whether each index value is found in the passed set of values.
isna()	Detect missing values
isnull()	Detect missing values
item()	return the first element of the underlying data as a python
join(other[, how, level, return_indexers, sort])	this is an internal non-public method
map(mapper)	Apply mapper function to an index.
max()	The maximum value of the object
memory_usage([deep])	Memory usage of my values
min()	The minimum value of the object
notna()	Inverse of isna
notnull()	Inverse of isna
nunique([dropna])	Return number of unique elements in the object.
putmask(mask, value)	return a new Index of the values set with the mask
ravel([order])	return an ndarray of the flattened values of the underlying data
reindex(target[, method, level, limit, ...])	Create index with target’s values (move/add/delete values as necessary)
rename(name[, inplace])	Set new names on index.
repeat(repeats, *args, **kwargs)	Repeat elements of an Index.
reshape(*args, **kwargs)	NOT IMPLEMENTED: do not call this method, as reshaping is not supported for Index objects and will raise an error.
searchsorted(value[, side, sorter])	Find indices where elements should be inserted to maintain order.
set_names(names[, level, inplace])	Set new names on index.
set_value(arr, key, value)	Fast lookup of value from 1-dimensional ndarray.
shift([periods, freq])	Shift Index containing datetime objects by input number of periods and
slice_indexer([start, end, step, kind])	For an ordered Index, compute the slice indexer for input labels and
slice_locs([start, end, step, kind])	Compute slice locations for input labels.
sort(*args, **kwargs)
sort_values([return_indexer, ascending])	Return sorted copy of Index
sortlevel([level, ascending, sort_remaining])	For internal compatibility with with the Index API
str	alias of StringMethods
summary([name])
symmetric_difference(other[, result_name])	Compute the symmetric difference of two Index objects.
take(indices[, axis, allow_fill, fill_value])	return a new Index of the values selected by the indices
to_datetime([dayfirst])	DEPRECATED: use pandas.to_datetime() instead.
to_frame([index])	Create a DataFrame with a column containing the Index.
to_native_types([slicer])	Format specified values of self and return them.
to_series(**kwargs)	Create a Series with both index and values equal to the index keys
tolist()	Return a list of the values.
transpose(*args, **kwargs)	return the transpose, which is by definition self
union(other)	Form the union of two Index objects and sorts if possible.
unique()	Return unique values in the object.
value_counts([normalize, sort, ascending, ...])	Returns object containing counts of unique values.
view([cls])
where(cond[, other])	New in version 0.19.0.