joinem

0.11.1 verified Mon Apr 27 auth: no python

CLI and Python library for fast, flexible concatenation of tabular data using Polars. Current version 0.11.1. Active development.

pip install joinem

Common errors

error ModuleNotFoundError: No module named 'joinem' ↓

cause joinem not installed.

fix

pip install joinem

error ModuleNotFoundError: No module named 'polars' ↓

cause Polars not installed alongside joinem.

fix

pip install joinem[polars]

Warnings

gotcha joinem relies on Polars; ensure Polars is installed. Using pip install joinem[polars] automatically installs it, but plain pip install joinem does not. ↓

fix Install with extras: pip install joinem[polars]

breaking The CLI interface changed in version 0.10.0 to use subcommands; scripts using the old command-line syntax may break. ↓

fix Update CLI usage: joinem --help for new syntax.

Imports

concat
wrong
```
from joinem.joinem import concat
```
correct
```
from joinem import concat
```
Common mistake when misreading the package structure.

Quickstart

Concatenate two Polars DataFrames using joinem.

from joinem import concat
import polars as pl

df1 = pl.DataFrame({"a": [1, 2], "b": [3, 4]})
df2 = pl.DataFrame({"a": [5, 6], "b": [7, 8]})
result = concat([df1, df2])
print(result)