Input and output

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NumPy API Reference: Input and output

NumPy binary files (NPY, NPZ)

load(file[, mmap_mode, allow_pickle])	Loads arrays or pickled objects from .npy, .npz or pickled file.
save(file, arr[, allow_pickle])	Saves an array to a binary file in .npy format.
savez(file, *args, **kwds)	Saves one or more arrays into a file in uncompressed .npz format.
savez_compressed(file, *args, **kwds)	Saves one or more arrays into a file in compressed .npz format.

Text files

loadtxt(*args, **kwargs)	Load data from a text file.
savetxt(fname, X, *args, **kwargs)	Save an array to a text file.
genfromtxt(*args, **kwargs)	Load data from text file, with missing values handled as specified.
fromstring(*args, **kwargs)	A new 1-D array initialized from text data in a string.

String formatting

array2string(a, *args, **kwargs)	Return a string representation of an array.
array_repr(arr[, max_line_width, precision, ...])	Returns the string representation of an array.
array_str(arr[, max_line_width, precision, ...])	Returns the string representation of the content of an array.
format_float_positional(x, *args, **kwargs)	Format a floating-point scalar as a decimal string in positional notation.
format_float_scientific(x, *args, **kwargs)	Format a floating-point scalar as a decimal string in scientific notation.

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.