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Introduction of RangeIndex #9977

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991c684
Introduction of RangeIndex
Apr 24, 2015
872775d
restore Index() fastpath precedence
Apr 24, 2015
57e0865
Various fixes suggested by @jreback and @shoyer
Apr 27, 2015
e8c31c5
fix slicing
May 1, 2015
b4d1085
fix view
May 2, 2015
ac18a31
Set RangeIndex as default index
May 1, 2015
c9ac12f
enh: various performance optimizations
May 2, 2015
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2 changes: 1 addition & 1 deletion pandas/core/api.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@
from pandas.core.categorical import Categorical
from pandas.core.groupby import Grouper
from pandas.core.format import set_eng_float_format
from pandas.core.index import Index, CategoricalIndex, Int64Index, Float64Index, MultiIndex
from pandas.core.index import Index, CategoricalIndex, Int64Index, RangeIndex, Float64Index, MultiIndex

from pandas.core.series import Series, TimeSeries
from pandas.core.frame import DataFrame
Expand Down
12 changes: 8 additions & 4 deletions pandas/core/common.py
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Expand Up @@ -86,6 +86,7 @@ def _check(cls, inst):
ABCCategoricalIndex = create_pandas_abc_type("ABCCategoricalIndex", "_typ", ("categoricalindex",))
ABCIndexClass = create_pandas_abc_type("ABCIndexClass", "_typ", ("index",
"int64index",
"rangeindex",
"float64index",
"multiindex",
"datetimeindex",
Expand Down Expand Up @@ -2142,10 +2143,8 @@ def is_bool_indexer(key):


def _default_index(n):
from pandas.core.index import Int64Index
values = np.arange(n, dtype=np.int64)
result = Int64Index(values,name=None)
result.is_unique = True
from pandas.core.index import RangeIndex
result = RangeIndex(0, int(n), name=None)
return result


Expand Down Expand Up @@ -2498,6 +2497,11 @@ def is_integer_dtype(arr_or_dtype):
not issubclass(tipo, (np.datetime64, np.timedelta64)))


def is_int64_dtype(arr_or_dtype):
tipo = _get_dtype_type(arr_or_dtype)
return issubclass(tipo, np.int64)


def is_int_or_datetime_dtype(arr_or_dtype):
tipo = _get_dtype_type(arr_or_dtype)
return (issubclass(tipo, np.integer) or
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6 changes: 3 additions & 3 deletions pandas/core/frame.py
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Expand Up @@ -4826,7 +4826,7 @@ def extract_index(data):
% (lengths[0], len(index)))
raise ValueError(msg)
else:
index = Index(np.arange(lengths[0]))
index = _default_index(lengths[0])

return _ensure_index(index)

Expand Down Expand Up @@ -5043,11 +5043,11 @@ def convert(arr):


def _get_names_from_index(data):
index = lrange(len(data))
has_some_name = any([getattr(s, 'name', None) is not None for s in data])
if not has_some_name:
return index
return _default_index(len(data))

index = lrange(len(data))
count = 0
for i, s in enumerate(data):
n = getattr(s, 'name', None)
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