> For the complete documentation index, see [llms.txt](https://docs.placekey.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.placekey.io/documentation/libraries/python.md).

# Python

## Placekey-py

The Placekey Python library makes it easy to work with Placekey. Detailed documentation for this package can be found [here](https://placekey.github.io/placekey-py/). This package runs on Python 3.

## Installation

This package can be installed from PyPI by

```bash
pip install placekey
```

## Usage

The basic functionality of the Placekey library is conversion between Placekeys and latitude-longitude coordinates.

```python
>>> import placekey as pk
>>> lat, long = 0.0, 0.0
>>> pk.geo_to_placekey(lat, long)
'@dvt-smp-tvz'
```

```python
>>> pk.placekey_to_geo('@dvt-smp-tvz')
(0.00018033323813810344, -0.00018985758738881587)
```

The library also allows for conversion between Placekeys and [H3 indices](https://github.com/uber/h3-py).

```python
>>> pk.placekey_to_h3('@dvt-smp-tvz')
'8a754e64992ffff'
```

```python
>>> pk.h3_to_placekey('8a754e64992ffff')
'@dvt-smp-tvz'
```

The distance in meters between two Placekeys can be found with the following function.

```python
>>> pk.placekey_distance('@dvt-smp-tvz', '@5vg-7gq-tjv')
12795124.895573696
```

An upper bound on the maximal distance in meters between two Placekeys based on the length of their shared prefix is provided by `placekey.get_prefix_distance_dict()`.

```python
>>> pk.get_prefix_distance_dict()
{0: 20040000.0,
 1: 20040000.0,
 2: 2777000.0,
 3: 1065000.0,
 4: 152400.0,
 5: 21770.0,
 6: 8227.0,
 7: 1176.0,
 8: 444.3,
 9: 63.47}
```

Placekeys found in a dataset can be partially validated by

```python
>>> pk.placekey_format_is_valid('222-227@dvt-smp-tvz')
True
```

```python
>>> pk.placekey_format_is_valid('@123-456-789')
False
```

## API Client

This package also includes a client for the Placekey API. The methods in the client are automatically rate limited.

```python
>>> from placekey.api import PlacekeyAPI
>>> placekey_api_key = "..."
>>> pk_api = PlacekeyAPI(placekey_api_key)
```

The `PlacekeyAPI.lookup_placekey` method can be used to lookup the Placekey for a single place.

```python
>>> pk_api.lookup_placekey(latitude=37.7371, longitude=-122.44283)
{'query_id': '0', 'placekey': '@5vg-82n-kzz'}
```

```python
>>> place = {
>>>   "location_name": "Twin Peaks Petroleum",
>>>   "street_address": "598 Portola Dr",
>>>   "city": "San Francisco",
>>>   "region": "CA",
>>>   "postal_code": "94131",
>>>   "iso_country_code": "US"
>>> }
>>> pk_api.lookup_placekey(**place, fields=["building_placekey","address_placekey"])
{'query_id': '0',
 'placekey': '227-223@5vg-82n-pgk',
 'address_placekey': '227@5vg-82n-pgk',
 'building_placekey': '227@5vg-82n-pgk'}
```

The `PlacekeyAPI.lookup_placekeys` method can be used to lookup Placekeys for multiple places.

```python
>>> places = [
>>>   {
>>>     "street_address": "1543 Mission Street, Floor 3",
>>>     "city": "San Francisco",
>>>     "region": "CA",
>>>     "postal_code": "94105",
>>>     "iso_country_code": "US"
>>>   },
>>>   {
>>>     "query_id": "thisqueryidaloneiscustom",
>>>     "location_name": "Twin Peaks Petroleum",
>>>     "street_address": "598 Portola Dr",
>>>     "city": "San Francisco",
>>>     "region": "CA",
>>>     "postal_code": "94131",
>>>     "iso_country_code": "US"
>>>   },
>>>   {
>>>     "latitude": 37.7371,
>>>     "longitude": -122.44283
>>>   }
>>> ]
>>> pk_api.lookup_placekeys(places)
[{'query_id': 'place_0', 'placekey': '22g@5vg-7gq-5mk'},
 {'query_id': 'thisqueryidaloneiscustom', 'placekey': '227-223@5vg-82n-pgk'},
 {'query_id': 'place_2', 'placekey': '@5vg-82n-kzz'}]
```

## Notebooks

Jupyter notebooks demonstrating various Placekey functionality are contained in the [placekey-notebooks](https://github.com/Placekey/placekey-notebooks) repository.

## Additional Information

More information about this library can be found on [Github](https://github.com/Placekey/placekey-py) where you can also submit pull requests, submit bugs, and feature suggestions.


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