numpy.savetxt()

fname : filename or file handle

If the filename ends in .gz, the file is automatically saved in compressed gzip format. loadtxt understands gzipped files transparently.

X : array_like

Data to be saved to a text file.

fmt : str or sequence of strs, optional

A single format (%10.5f), a sequence of formats, or a multi-format string, e.g. ?Iteration %d ? %10.5f?, in which case delimiter is ignored. For complex X, the legal options for fmt are:

1. a single specifier, fmt=?%.4e?, resulting in numbers formatted

   like ? (%s+%sj)? % (fmt, fmt)

2. a full string specifying every real and imaginary part, e.g.

   ? %.4e %+.4j %.4e %+.4j %.4e %+.4j? for 3 columns

3. a list of specifiers, one per column - in this case, the real

   and imaginary part must have separate specifiers, e.g. [?%.3e + %.3ej?, ?(%.15e%+.15ej)?] for 2 columns

delimiter : str, optional

String or character separating columns.

newline : str, optional

String or character separating lines.

header : str, optional

String that will be written at the beginning of the file.

footer : str, optional

String that will be written at the end of the file.

comments : str, optional

String that will be prepended to the header and footer strings, to mark them as comments. Default: ?# ?, as expected by e.g. numpy.loadtxt.