numpy.packbits() in Python

`numpy.packbits()` is another function for doing binary operations in numpy.It is used to packs the elements of a binary-valued array into bits in a uint8 array.The result is padded to full bytes by inserting zero bits at the end.

Syntax : numpy.packbits(arr, axis=None)

Parameters :
arr : [array_like] An array of integers or booleans whose elements should be packed to bits.
axis : [ int, optional] The dimension over which bit-packing is done.If none then packing is done in flattened array.

Return : [packed ndarray] Array of type uint8 whose elements represent bits corresponding to the logical (0 or nonzero) value of the input elements.

Code #1 :

 `# Python program explaining ` `# numpy.packbits() function ` ` `  `# importing numpy ` `import` `numpy as geek ` ` `  `# creating input array using  ` `# array function ` `in_arr ``=` `geek.array([[[``1``, ``0``, ``1``], ` `                     ``[``0``, ``1``, ``0``]], ` `                     ``[[``1``, ``1``, ``0``], ` `                        ``[``0``, ``0``, ``1``]]]) ` `print` `(``"Input array : "``, in_arr)  ` ` `  `# packing elements of an array ` `# using packbits() function ` `out_arr ``=` `geek.packbits(in_arr) ` ` `  `print` `(``"Output packed array : "``, out_arr) `

Output :

```Input array :
[[[1 0 1]
[0 1 0]]

[[1 1 0]
[0 0 1]]]
Output packed array :  [171  16]
```

Code #2 :

 `# Python program explaining ` `# numpy.packbits() function ` ` `  `# importing numpy ` `import` `numpy as geek ` ` `  `# creating input array using  ` `# array function ` `in_arr ``=` `geek.array([[[``0``, ``0``, ``1``], ` `                     ``[``1``, ``1``, ``0``]], ` `                     ``[[``1``, ``0``, ``0``], ` `                        ``[``1``, ``1``, ``1``]]]) ` `print` `(``"Input array : "``, in_arr)  ` ` `  `# packing elements of an array ` `# using packbits() function ` `out_arr ``=` `geek.packbits(in_arr, axis ``=` `1``) ` ` `  `print` `(``"Output packed array along axis 1 : "``, out_arr)  `

Output :

```Input array :  [[[0 0 1]
[1 1 0]]

[[1 0 0]
[1 1 1]]]
Output packed array along axis 1 :  [[[ 64  64 128]]

[[192  64  64]]]
```

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