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# Copyright (c) 2017 Weitian LI <weitian@aaronly.me>
# MIT license
"""
Input/output utilities.
"""
import os
import logging
import pandas as pd
logger = logging.getLogger(__name__)
def dataframe_to_csv(df, outfile, clobber=False):
"""
Save the given Pandas DataFrame into a CSV text file.
Parameters
----------
df : `~pandas.DataFrame`
The DataFrame to be saved to the CSV text file.
outfile : string
The path to the output CSV file.
clobber : bool, optional
Whether overwrite the existing output file?
Default: False
"""
if not isinstance(df, pd.DataFrame):
raise TypeError("Not a Pandas DataFrame!")
# Create directory if necessary
dirname = os.path.dirname(outfile)
if not os.path.exists(dirname):
os.makedirs(dirname)
logger.info("Created output directory: {0}".format(dirname))
if os.path.exists(outfile):
if clobber:
logger.warning("Remove existing file: {0}".format(outfile))
os.remove(outfile)
else:
raise OSError("Output file exists: {0}".format(outfile))
df.to_csv(outfile, header=True, index=False)
logger.info("Saved DataFrame to CSV file: {0}".format(outfile))
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