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Python package ismember returns array elements that are members of set array.

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Python PyPI Version License Downloads Downloads Sphinx

ismember is a Python library that checks whether the elements in X is present in Y.

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Documentation pages

On the documentation pages you can find more information about ismember with examples.

Install ismember from PyPI
pip install ismember     # normal install
pip install -U ismember  # update if needed

Import ismember package

from ismember import ismember

Quick example

Use the documentation pages for more detailed usage. Some of the most used functionalities are linked below.

from ismember import ismember

# Example with lists
I, idx = ismember([1,2,3,None], [4,1,2])
I, idx = ismember(["1","2","3"], ["4","1","2"])

Example: Check whether the elements of X are present in Y

Example: Determine the corresponding location of the values that are present in Y array

Example: Row wise comparison

Example: Elementwise comparison



  • Erdogan Taskesen, github: erdogant
  • Contributions are welcome.
  • If you wish to buy me a Coffee for this work, it is very appreciated :)

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