hmm-viewer 2.0.0

View CSV, Parquet files and pandas/polars DataFrames in a terminal UI

hmm-viewer

Python package for hmm — a terminal UI for viewing CSV and Parquet files.

The Go binary is automatically downloaded from GitHub releases on first use. No need to install Go.

Installation

uv pip install hmm-viewer              # base install
uv pip install 'hmm-viewer[pandas]'    # with pandas support
uv pip install 'hmm-viewer[polars]'    # with polars support

Usage

CLI

After installing, the hmm command is available:

hmm data.csv
hmm data.parquet

Python API

from hmm_viewer import hmm

# Works with pandas DataFrames
import pandas as pd
df = pd.read_csv("data.csv")
hmm(df)

# Works with polars DataFrames
import polars as pl
df = pl.read_parquet("data.parquet")
hmm(df)

This is especially useful from a debugger (ipdb, pdb, ipython) to quickly inspect a DataFrame in the terminal.

How it works

• CLI: The hmm command is a thin wrapper that delegates to the Go binary.
• Python API: hmm(df) writes the DataFrame to a temporary Parquet file, launches the hmm binary, and cleans up the temp file when done.
• Auto-download: If the Go binary isn't found on $PATH or ~/go/bin, it is automatically downloaded from GitHub releases and cached at ~/.cache/hmm/.