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Asked: 2026-05-26T05:02:03+00:00

I am new to Numpy and trying to search for a function to list

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I am new to Numpy and trying to search for a function to list out the variables along with their sizes (both the matrix dimensions as well as memory usage).

I am essentially looking for an equivalent of the “whos” command in MATLAB and Octave. Does there exist any such command in NumPy?

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  1. Editorial Team

    If you are using IPython, there is a whos command built-in:

    In [9]: whos
Variable   Type       Data/Info
-------------------------------
a          ndarray    4x4x3: 48 elems, type `int64`, 384 bytes
b          ndarray    100000: 100000 elems, type `int64`, 800000 bytes (781 kb)
np         module     <module 'numpy' from '/Li<...>kages/numpy/__init__.py'>

    In general I highly recommend using IPython when doing interactive work in python with numpy/scipy/matplotlib/etc. Fernando Perez and others are actively adding a lot of great features.

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