Ways to import `PrometheusConnect` without also importing **huge** pandas and matplotlib

[buttonfly1000]

Is your feature request related to a problem? Please describe.

I found this simple import

from prometheus_api_client import PrometheusConnect

not only import PrometheusConnect itself, but also pandas and possibly matplotlib, which take about 50MB more unnecessary memory when I don't want to use DataFrames and plot them.

Is there any way to only import PrometheusConnect without also importing huge pandas and matplotlib?

[chauhankaranraj]

not only import PrometheusConnect itself, but also pandas and possibly matplotlib, which take about 50MB more unnecessary memory when I don't want to use DataFrames and plot them.

Hi @thetaprimeprime, that's an great observation! I did some memory profiling and can confirm that the additional pandas and matplotlib imports do indeed increase the memory usage by about ~45MB.

Is there any way to only import PrometheusConnect without also importing huge pandas and matplotlib?

At the moment, I don't think so. But I believe this would be a nice and welcome improvement 😃 Is this something you'd like to work on, or would you rather someone from our team do it?

One way to accomplish this could be to refactor this python module into submodules, something like this:

prometheus_api_client
├── core
│   ├── __init__.py
│   └── prometheus_connect.py
├── exceptions
│   ├── base_exception.py
│   └── __init__.py
├── __init__.py --> only import core.* here, to avoid importing mpl, pandas
├── parsers
│   ├── __init__.py
│   ├── metric.py
│   ├── metric_range_df.py
│   ├── metrics_list.py
│   └── metric_snapshot_df.py
└── utils
    ├── datetime_utils.py
    ├── __init__.py
    └── print_utils.py

Just a suggestion off the top of my head, we should explore other ideas as well.

/cc @4n4nd

[sesheta]

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[sesheta]

@sesheta: Closing this issue.

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[raqbit]

This is also making it hard to use prometheus-api-client-python in alpine-based docker images, as both matplotlib & pandas need to build wheels.

[4n4nd]

@raqbit do you have any suggestions on how we could improve this?