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""" Tablib - DataFrame Support.
"""
try:
from pandas import DataFrame
except ImportError:
DataFrame = None
class DataFrameFormat:
title = 'df'
extensions = ('df',)
@classmethod
def detect(cls, stream):
"""Returns True if given stream is a DataFrame."""
if DataFrame is None:
return False
elif isinstance(stream, DataFrame):
return True
try:
DataFrame(stream.read())
return True
except ValueError:
return False
@classmethod
def export_set(cls, dset, index=None):
"""Returns DataFrame representation of DataBook."""
if DataFrame is None:
raise NotImplementedError(
'DataFrame Format requires `pandas` to be installed.'
' Try `pip install "tablib[pandas]"`.')
dataframe = DataFrame(dset.dict, columns=dset.headers)
return dataframe
@classmethod
def import_set(cls, dset, in_stream):
"""Returns dataset from DataFrame."""
dset.wipe()
dset.dict = in_stream.to_dict(orient='records')
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