pandas_diff
Generate event logs of row-level changes between two pandas DataFrames.
Not a statistical comparison tool — pandas_diff tells you what changed: which rows were created, deleted, or modified, and exactly which fields changed.
Installation
pip install pandas_diff
# With Parquet support
pip install pandas_diff[parquet]
Quick start
import pandas as pd
from pandas_diff import get_diffs
before = pd.DataFrame([
{"hero": "hulk", "power": "strength"},
{"hero": "black_widow", "power": "spy"},
{"hero": "thor", "hammers": 0},
])
after = pd.DataFrame([
{"hero": "hulk", "power": "smart"},
{"hero": "captain marvel", "power": "strength"},
{"hero": "thor", "hammers": 2},
])
df = get_diffs(before, after, keys="hero")
| operation | object_keys | object_values | attribute_changed | old_value | new_value |
|---|---|---|---|---|---|
| create | [hero] | captain marvel | |||
| delete | [hero] | black_widow | |||
| modify | [hero] | hulk | power | strength | smart |
| modify | [hero] | thor | hammers | 0 | 2 |
CLI
pandas_diff before.csv after.csv --keys id
pandas_diff old.parquet new.parquet --keys name,date --format json
pandas_diff a.csv b.csv --keys id --ignore updated_at -o diff.csv
Supported file formats: CSV, JSON (flat records), Parquet.
Use cases
- Batch to event-driven migration — Detect changes between pipeline runs and stream them to Kafka.
- Audit event logs — Track how resources change over time.
- Data conciliation — Compare a CMDB against the real state of infrastructure.
- Environment sync — Propagate changes between production and disaster recovery.
API
get_diffs(
before: pd.DataFrame, # Previous state
after: pd.DataFrame, # Current state
keys: list[str] | str, # Column(s) identifying each row
ignore_columns: list[str], # Columns to skip (optional)
) -> pd.DataFrame
Returns a DataFrame with columns: operation, object_keys, object_values, object_json, attribute_changed, old_value, new_value.
License
MIT
1 maintainer
Release files for pandas-diff 2.0.0
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| pandas_diff-2.0.0.tar.gz | 13.2 kB | Details |
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|---|---|---|---|---|
| pandas_diff-2.0.0-py3-none-any.whl | Python 3 | none | any | Details |
Total release size:21.3 kB
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| Uploaded via |
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