Input and output

NPZ files

load (file[, mmap_mode])	Load a pickled, .npy, or .npz binary file.
save (file, arr)	Save an array to a binary file in NumPy format.
savez (file, *args, **kwds)	Save several arrays into an .npz file format which is a zipped-archive of arrays

Text files

loadtxt (fname[, dtype, comments, ...])	Load data from a text file.
savetxt (fname, X[, fmt, delimiter])	Save an array to file.
fromregex (file, regexp, dtype)	Construct an array from a text file, using regular-expressions parsing.
fromstring (string[, dtype, count, sep])	Return a new 1d array initialized from raw binary or text data in string.
ndarray.tofile (fid[, sep, format])	Write array to a file as text or binary.
ndarray.tolist ()	Return the array as a possibly nested list.

String formatting

array_repr (arr[, max_line_width, ...])	Return the string representation of an array.
array_str (a[, max_line_width, ...])	Return a string representation of an array.

Memory mapping files

memmap

Create a memory-map to an array stored in a file on disk.

Text formatting options

set_printoptions ([precision, threshold, ...])	Set printing options.
get_printoptions ()	Return the current print options.
set_string_function (f[, repr])	Set a Python function to be used when pretty printing arrays.

Base-n representations

binary_repr (num[, width])	Return the binary representation of the input number as a string.
base_repr (number[, base, padding])	Return a string representation of a number in the given base system.

Data sources

DataSource

A generic data source file (file, http, ftp, ...).