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ENH: Add Timedelta Support to JSON Reader with orient=table (#21140) #21827

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ENH: Add Timedelta Support to JSON Reader with orient=table (#21140) #21827

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7be068b
ENH: Add Timedelta Support to JSON Reader with orient=table (#21140)
fjdiod Jul 9, 2018
7f1336c
add whatsnew entry
fjdiod Jul 20, 2018
b0150e4
ENH: Add Timedelta Support to JSON Reader with orient=table (#21140)
fjdiod Jul 9, 2018
ed0e1fe
add whatsnew entry
fjdiod Jul 20, 2018
6842582
fix typo
fjdiod Jul 26, 2018
0f28fd0
Merge remote-tracking branch 'upstream/master' into json-iso
fjdiod Jul 26, 2018
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1 change: 1 addition & 0 deletions doc/source/whatsnew/v0.24.0.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,7 @@ Other Enhancements
- :class:`IntervalIndex` has gained the :meth:`~IntervalIndex.set_closed` method to change the existing ``closed`` value (:issue:`21670`)
- :func:`~DataFrame.to_csv` and :func:`~DataFrame.to_json` now support ``compression='infer'`` to infer compression based on filename (:issue:`15008`)
- :func:`to_timedelta` now supports iso-formated timedelta strings (:issue:`21877`)
- :func:`read_json` now parses timedelta with `orient='table'` (:issue:`21140`)
- :class:`Series` and :class:`DataFrame` now support :class:`Iterable` in constructor (:issue:`2193`)

.. _whatsnew_0240.api_breaking:
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11 changes: 5 additions & 6 deletions pandas/io/json/table_schema.py
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Expand Up @@ -6,7 +6,7 @@
import warnings

import pandas._libs.json as json
from pandas import DataFrame
from pandas import DataFrame, to_timedelta
from pandas.api.types import CategoricalDtype
import pandas.core.common as com
from pandas.core.dtypes.common import (
Expand Down Expand Up @@ -163,7 +163,7 @@ def convert_json_field_to_pandas_type(field):
elif typ == 'boolean':
return 'bool'
elif typ == 'duration':
return 'timedelta64'
return 'timedelta64[ns]'
elif typ == 'datetime':
if field.get('tz'):
return 'datetime64[ns, {tz}]'.format(tz=field['tz'])
Expand Down Expand Up @@ -306,10 +306,9 @@ def parse_table_schema(json, precise_float):
raise NotImplementedError('table="orient" can not yet read timezone '
'data')

# No ISO constructor for Timedelta as of yet, so need to raise
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was this not hit in tests prior to this PR?

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Should have been covered by test_read_json_table_orient_raises through parametrization

if 'timedelta64' in dtypes.values():
raise NotImplementedError('table="orient" can not yet read '
'ISO-formatted Timedelta data')
for col, dtype in dtypes.items():
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Is this block necessary? Assumed the subsequent astype call would take care of this

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So, support for iso-format timedeltas should be added to astype function?

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No just go with what jreback said for now.

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hmm, are you sure you need to do this? I believe .astype(dtypes) should handle this, and if not we should fix that.

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For now

delta = pd.Timedelta(1e9).isoformat()
pd.DataFrame([delta]).astype('timedelta64[ns]')

results in error.

if dtype == 'timedelta64[ns]':
df[col] = to_timedelta(df[col])

df = df.astype(dtypes)

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6 changes: 3 additions & 3 deletions pandas/tests/io/json/test_json_table_schema.py
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Expand Up @@ -390,7 +390,7 @@ def test_convert_pandas_type_to_json_field_categorical(self, kind,
({'type': 'integer'}, 'int64'),
({'type': 'number'}, 'float64'),
({'type': 'boolean'}, 'bool'),
({'type': 'duration'}, 'timedelta64'),
({'type': 'duration'}, 'timedelta64[ns]'),
({'type': 'datetime'}, 'datetime64[ns]'),
({'type': 'datetime', 'tz': 'US/Hawaii'}, 'datetime64[ns, US/Hawaii]'),
({'type': 'any'}, 'object'),
Expand Down Expand Up @@ -499,6 +499,7 @@ class TestTableOrientReader(object):
'level_0'])
@pytest.mark.parametrize("vals", [
{'ints': [1, 2, 3, 4]},
{'timedeltas': pd.timedelta_range('1H', periods=4, freq='T')},
{'objects': ['a', 'b', 'c', 'd']},
{'date_ranges': pd.date_range('2016-01-01', freq='d', periods=4)},
{'categoricals': pd.Series(pd.Categorical(['a', 'b', 'c', 'c']))},
Expand All @@ -516,7 +517,6 @@ def test_read_json_table_orient(self, index_nm, vals, recwarn):
@pytest.mark.parametrize("index_nm", [
None, "idx", "index"])
@pytest.mark.parametrize("vals", [
{'timedeltas': pd.timedelta_range('1H', periods=4, freq='T')},
{'timezones': pd.date_range('2016-01-01', freq='d', periods=4,
tz='US/Central')}])
def test_read_json_table_orient_raises(self, index_nm, vals, recwarn):
Expand All @@ -530,7 +530,7 @@ def test_comprehensive(self):
{'A': [1, 2, 3, 4],
'B': ['a', 'b', 'c', 'c'],
'C': pd.date_range('2016-01-01', freq='d', periods=4),
# 'D': pd.timedelta_range('1H', periods=4, freq='T'),
'D': pd.timedelta_range('1H', periods=4, freq='T'),
'E': pd.Series(pd.Categorical(['a', 'b', 'c', 'c'])),
'F': pd.Series(pd.Categorical(['a', 'b', 'c', 'c'],
ordered=True)),
Expand Down