71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
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"""
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Read SAS sas7bdat or xport files.
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"""
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from pandas import compat
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from pandas.io.common import _stringify_path
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def read_sas(filepath_or_buffer, format=None, index=None, encoding=None,
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chunksize=None, iterator=False):
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"""
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Read SAS files stored as either XPORT or SAS7BDAT format files.
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Parameters
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----------
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filepath_or_buffer : string or file-like object
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Path to the SAS file.
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format : string {'xport', 'sas7bdat'} or None
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If None, file format is inferred. If 'xport' or 'sas7bdat',
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uses the corresponding format.
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index : identifier of index column, defaults to None
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Identifier of column that should be used as index of the DataFrame.
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encoding : string, default is None
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Encoding for text data. If None, text data are stored as raw bytes.
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chunksize : int
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Read file `chunksize` lines at a time, returns iterator.
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iterator : bool, defaults to False
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If True, returns an iterator for reading the file incrementally.
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Returns
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-------
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DataFrame if iterator=False and chunksize=None, else SAS7BDATReader
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or XportReader
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"""
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if format is None:
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buffer_error_msg = ("If this is a buffer object rather "
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"than a string name, you must specify "
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"a format string")
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filepath_or_buffer = _stringify_path(filepath_or_buffer)
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if not isinstance(filepath_or_buffer, compat.string_types):
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raise ValueError(buffer_error_msg)
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try:
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fname = filepath_or_buffer.lower()
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if fname.endswith(".xpt"):
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format = "xport"
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elif fname.endswith(".sas7bdat"):
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format = "sas7bdat"
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else:
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raise ValueError("unable to infer format of SAS file")
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except:
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pass
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if format.lower() == 'xport':
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from pandas.io.sas.sas_xport import XportReader
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reader = XportReader(filepath_or_buffer, index=index,
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encoding=encoding,
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chunksize=chunksize)
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elif format.lower() == 'sas7bdat':
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from pandas.io.sas.sas7bdat import SAS7BDATReader
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reader = SAS7BDATReader(filepath_or_buffer, index=index,
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encoding=encoding,
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chunksize=chunksize)
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else:
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raise ValueError('unknown SAS format')
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if iterator or chunksize:
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return reader
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data = reader.read()
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reader.close()
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return data
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