# Django 2.2.9.dev20191202104323 文档

# Geolocation with GeoIP2

The `GeoIP2` object is a wrapper for the MaxMind geoip2 Python library. [1]

In order to perform IP-based geolocation, the `GeoIP2` object requires the geoip2 Python library and the GeoIP Country and/or City datasets in binary format (the CSV files will not work!). Grab the `GeoLite2-Country.mmdb.gz` and `GeoLite2-City.mmdb.gz` files and unzip them in a directory corresponding to the `GEOIP_PATH` setting.

Additionally, it is recommended to install the libmaxminddb C library, so that `geoip2` can leverage the C library's faster speed.

## 例如

Here is an example of its usage:

    >>> from django.contrib.gis.geoip2 import GeoIP2
    >>> g = GeoIP2()
    >>> g.country('google.com')
    {'country_code': 'US', 'country_name': 'United States'}
    >>> g.city('72.14.207.99')
    {'city': 'Mountain View',
    'continent_code': 'NA',
    'continent_name': 'North America',
    'country_code': 'US',
    'country_name': 'United States',
    'dma_code': 807,
    'latitude': 37.419200897216797,
    'longitude': -122.05740356445312,
    'postal_code': '94043',
    'region': 'CA',
    'time_zone': 'America/Los_Angeles'}
    >>> g.lat_lon('salon.com')
    (39.0437, -77.4875)
    >>> g.lon_lat('uh.edu')
    (-95.4342, 29.834)
    >>> g.geos('24.124.1.80').wkt
    'POINT (-97 38)'

## API参考

class `GeoIP2`(path=None, cache=0, country=None, city=None)

The `GeoIP` object does not require any parameters to use the default settings. However, at the very least the `GEOIP_PATH` setting should be set with the path of the location of your GeoIP datasets. The following initialization keywords may be used to customize any of the defaults.

Keyword Arguments | 描述
--- | ---
`path` | Base directory to where GeoIP data is located or the full path to where the city or country data files (`.mmdb`) are located. Assumes that both the city and country datasets are located in this directory; overrides the `GEOIP_PATH` setting.
`cache` | The cache settings when opening up the GeoIP datasets. May be an integer in (0, 1, 2, 4, 8) corresponding to the `MODE_AUTO`, `MODE_MMAP_EXT`, `MODE_MMAP`, and `GEOIP_INDEX_CACHE` `MODE_MEMORY` C API settings, respectively. Defaults to 0 (`MODE_AUTO`).
`country` | The name of the GeoIP country data file. Defaults to `GeoLite2-Country.mmdb`. Setting this keyword overrides the `GEOIP_COUNTRY` setting.
`city` | The name of the GeoIP city data file. Defaults to `GeoLite2-City.mmdb`. Setting this keyword overrides the `GEOIP_CITY` setting.

## 方法

### Instantiating

classmethod `GeoIP2.``open`(path, cache)

This classmethod instantiates the GeoIP object from the given database path and given cache setting.

### Querying

All the following querying routines may take either a string IP address or a fully qualified domain name (FQDN). For example, both `'205.186.163.125'` and `'djangoproject.com'` would be valid query parameters.

`GeoIP2.``city`(query)

Returns a dictionary of city information for the given query. Some of the values in the dictionary may be undefined (`None`).

`GeoIP2.``country`(query)

Returns a dictionary with the country code and country for the given query.

`GeoIP2.``country_code`(query)

Returns the country code corresponding to the query.

`GeoIP2.``country_name`(query)

Returns the country name corresponding to the query.

### Coordinate Retrieval

`GeoIP2.``coords`(query)

Returns a coordinate tuple of (longitude, latitude).

`GeoIP2.``lon_lat`(query)

Returns a coordinate tuple of (longitude, latitude).

`GeoIP2.``lat_lon`(query)

Returns a coordinate tuple of (latitude, longitude),

`GeoIP2.``geos`(query)

Returns a `Point` object corresponding to the query.

## 配置

### `GEOIP_PATH`

A string specifying the directory where the GeoIP data files are located. This setting is required unless manually specified with `path` keyword when initializing the `GeoIP2` object.

### `GEOIP_COUNTRY`

The basename to use for the GeoIP country data file. Defaults to `'GeoLite2-Country.mmdb'`.

### `GEOIP_CITY`

The basename to use for the GeoIP city data file. Defaults to `'GeoLite2-City.mmdb'`.

## 例外

exception `GeoIP2Exception`

  The exception raised when an error occurs in a call to the underlying `geoip2` library.

Footnotes

[1] | GeoIP(R) is a registered trademark of MaxMind, Inc.