Input and output
NumPy binary files (NPY, NPZ)
| method | description |
|---|---|
| load(file[, mmap_mode, allow_pickle, …]) | Load arrays or pickled objects from .npy, .npz or pickled files. |
| save(file, arr[, allow_pickle, fix_imports]) | Save an array to a binary file in NumPy .npy format. |
| savez(file, *args, **kwds) | Save several arrays into a single file in uncompressed .npz format. |
| savez_compressed(file, *args, **kwds) | Save several arrays into a single file in compressed .npz format. |
The format of these binary file types is documented in numpy.lib.format
Text files
| method | description |
|---|---|
| loadtxt(fname[, dtype, comments, delimiter, …]) | Load data from a text file. |
| savetxt(fname, X[, fmt, delimiter, newline, …]) | Save an array to a text file. |
| genfromtxt(fname[, dtype, comments, …]) | Load data from a text file, with missing values handled as specified. |
| fromregex(file, regexp, dtype[, encoding]) | Construct an array from a text file, using regular expression parsing. |
| fromstring(string[, dtype, count, sep]) | A new 1-D array initialized from text data in a string. |
| ndarray.tofile(fid[, sep, format]) | Write array to a file as text or binary (default). |
| ndarray.tolist() | Return the array as an a.ndim-levels deep nested list of Python scalars. |
Raw binary files
| method | description |
|---|---|
| fromfile(file[, dtype, count, sep, offset]) | Construct an array from data in a text or binary file. |
| ndarray.tofile(fid[, sep, format]) | Write array to a file as text or binary (default). |
String formatting
| method | description |
|---|---|
| array2string(a[, max_line_width, precision, …]) | Return a string representation of an array. |
| array_repr(arr[, max_line_width, precision, …]) | Return the string representation of an array. |
| array_str(a[, max_line_width, precision, …]) | Return a string representation of the data in an array. |
| format_float_positional(x[, precision, …]) | Format a floating-point scalar as a decimal string in positional notation. |
| format_float_scientific(x[, precision, …]) | Format a floating-point scalar as a decimal string in scientific notation. |
Memory mapping files
| method | description |
|---|---|
| memmap | Create a memory-map to an array stored in a binary file on disk. |
Text formatting options
| method | description |
|---|---|
| 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. |
| printoptions(\*args, \*\*kwargs) | Context manager for setting print options. |
Base-n representations
| method | description |
|---|---|
| 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
| method | description |
|---|---|
| DataSource([destpath]) | A generic data source file (file, http, ftp, …). |
Binary Format Description
| method | description |
|---|---|
| lib.format | Binary serialization |