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https://github.com/kozodoi/dptools
Python package with utilities for data processing, aggregation, feature engineering and data versioning
https://github.com/kozodoi/dptools
aggregation data-preparation data-preprocessing data-science feature-engineering python
Last synced: about 2 months ago
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Python package with utilities for data processing, aggregation, feature engineering and data versioning
- Host: GitHub
- URL: https://github.com/kozodoi/dptools
- Owner: kozodoi
- License: mit
- Created: 2020-04-15T10:01:28.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2022-04-19T13:41:33.000Z (over 2 years ago)
- Last Synced: 2024-07-17T18:35:28.978Z (2 months ago)
- Topics: aggregation, data-preparation, data-preprocessing, data-science, feature-engineering, python
- Language: Python
- Homepage: https://pypi.org/project/dptools/
- Size: 108 KB
- Stars: 3
- Watchers: 1
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# dptools: data preprocessing functions for Python
---
[](https://pypi.org/project/dptools/)
[](https://pypi.org/project/dptools/)
[](https://www.repostatus.org/#active)
[](http://choosealicense.com/licenses/mit/)
[](https://travis-ci.com/kozodoi/dptools)
[](https://pypi.org/project/dptools/)
---
## Overview
The `dptools` Python package provides helper functions to simplify common data processing tasks in a data science pipeline, including feature engineering, data aggregation, working with missing values and more.
The package currently encompasses the following functions:
- Feature engineering:
- `add_date_features()`: create date and time-based features
- `add_text_features()`: create text-based features (including counts and TF-IDF)
- `aggregate_data()`: aggregate data and create features based on aggregated statistics
- `encode_factors()`: perform label or dummy encoding of categorical features
- Data processing:
- `split_nested_features()`: split features nested in a single column
- `fill_missings()`: replace missings with specific values
- `correct_colnames()`: correct column names to be unique and remove foreign symbols
- `print_missings()`: print information on features with missing values
- `print_factor_levels()`: print levels of categorical features
- Data cleaning:
- `find_correlated_features()`: identify features with a high pairwise correlation
- `find_constant_features()`: identify features with a single unique value
- Import and versioning:
- `read_csv_with_json()`: read CSV where some columns are in JSON format
- `save_csv_version()`: save CSV with an automatically assigned version to prevent overwriting
## Installation
The latest stable release of `dptools` can be installed from PyPI:
```
pip install dptools
```
You may also install the development version from Github:
```
pip install git+https://github.com/kozodoi/dptools.git
```
After the installation, you can import the included functions:
```py
from dptools import *
```
## Examples
This section contains a few examples of using functions from `dptools` for different data preprocessing tasks. Please refer to the docstring documentation in the implemented functions for further examples.
### Creating a toy data set
First, let us create a toy data frame to demonstrate the package functionality.
```py
# import dependencies
import pandas as pd
import numpy as np
# create data frame
data = {'age': [27, np.nan, 30, 25, np.nan],
'height': [170, 168, 173, 177, 165],
'gender': ['female', 'male', np.nan, 'male', 'female'],
'income': ['high', 'medium', 'low', 'low', 'no income']}
df = pd.DataFrame(data)
```
| age | height | gender | income |
|---:| ---:| ---:| ---:|
| 27.0 | 170 | female | high |
| NaN | 168 | male | medium |
| 30.0 | 173 | NaN | low |
| 25.0 | 177 | male | low |
| NaN | 165 | female | no income |
### Aggregating features
```py
# aggregating the data
from dptools import aggregate_data
df_new = aggregate_data(df, group_var = 'gender', num_stats = ['mean', 'max'], fac_stats = 'mode')
```
| gender | age_mean | age_max | height_mean | height_max | income_mode |
|---:| ---:| ---:| ---:| ---:| ---:|
| female | 27.0 | 27.0 | 167.5 | 170 | 'high' |
| male | 25.0 | 25.0 | 172.5 | 177 | 'low' |
### Creating text-based features
```py
# creating text-based features
from dptools import add_text_features
df_new = add_text_features(df, text_vars = 'income')
```
| age | height | gender | income_word_count | income_char_count | income_tfidf_0 | ... | income_tfidf_3 |
|---:| ---:| ---:| ---:| ---:| ---:| ---:| ---:|
| 27.0 | 170 | female | 1 | 4 | 1.0 | ... | 0.0 |
| NaN | 168 | male | 1 | 6 | 0.0 | ... | 1.0 |
| 30.0 | 173 | NaN | 1 | 3 | 0.0 | ... | 0.0 |
| 25.0 | 177 | male | 1 | 3 | 0.0 | ... | 0.0 |
| NaN | 165 | female | 2 | 9 | 0.0 | ... | 0.0 |
### Working with missings
```py
# print statistics on missing values
from dptools import print_missings
print_missings(df)
```
| | Total | Percent |
|---:| ---:| ---:|
| age | 2 | 0.4 |
| gender | 1 | 0.2 |
### Finding correlated features
```py
# displays one correlated feature from each pair
from dptools import find_correlated_features
feats = find_correlated_features(df, cutoff = 0.4, method = 'spearman')
feats
```
> Found 1 correlated features.
> ['age']
### Data versioning
```py
# first call saves df as 'data_v1.csv'
from dptools import save_csv_version
save_csv_version('data.csv', df, index = False)
# second call saves df as 'data_v2.csv' as data_v1.csv already exists
save_csv_version('data.csv', df, index = False)
```
## Dependencies
Installation requires Python 3.7+ and the following packages:
- [numpy](https://www.numpy.org)
- [pandas](https://pandas.pydata.org)
- [sklearn](https://scikit-learn.org)
- [scipy](https://scipy.org)
## Feedback
In case you need help on the included data preprocessing functions or you want to report an issue, please do so at the corresponding [GitHub page](https://github.com/kozodoi/dptools/issues).