| path_or_buf | string or file handle, default None File path or object, if None is provided the result is returned as a string. |
| sep | character, default ‘,’ Field delimiter for the output file. |
| na_rep | string, default ‘’ Missing data representation |
| float_format | string, default None Format string for floating point numbers |
| columns | sequence, optional Columns to write |
| header | boolean or list of string, default True Write out column names. If a list of string is given it is assumed to be aliases for the column names |
| index | boolean, default True Write row names (index) |
| index_label | string or sequence, or False, default None Column label for index column(s) if desired. If None is given, and header and index are True, then the index names are used. A sequence should be given if the DataFrame uses MultiIndex. If False do not print fields for index names. Use index_label=False for easier importing in R |
| nanRep | None deprecated, use na_rep |
| mode | str Python write mode, default ‘w’ |
| encoding | string, optional A string representing the encoding to use in the output file, defaults to ‘ascii’ on Python 2 and ‘utf-8’ on Python 3. |
| compression | string, optional a string representing the compression to use in the output file, allowed values are ‘gzip’, ‘bz2’, ‘xz’, only used when the first argument is a filename |
| line_terminator | string, default ‘n’ The newline character or character sequence to use in the output file |
| quoting | optional constant from csv module defaults to csv.QUOTE_MINIMAL |
| quotechar | string (length 1), default ‘”’ character used to quote fields |
| doublequote | boolean, default True Control quoting of quotechar inside a field |
| escapechar | string (length 1), default None character used to escape sep and quotechar when appropriate |
| chunksize | int or None rows to write at a time |
| tupleize_cols | boolean, default False write multi_index columns as a list of tuples (if True) or new (expanded format) if False) |
| date_format | string, default None Format string for datetime objects |
| decimal | string, default ‘.’ Character recognized as decimal separator. E.g. use ‘,’ for European data |
