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ee.Dictionary.get
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Estrae un valore denominato da un dizionario. Se il dizionario non contiene la chiave specificata, viene restituito defaultValue, a meno che non sia null.
| Utilizzo | Resi |
|---|
Dictionary.get(key, defaultValue) | Oggetto |
| Argomento | Tipo | Dettagli |
|---|
questo: dictionary | Dizionario | |
key | Stringa | |
defaultValue | Oggetto, valore predefinito: null | |
Esempi
Editor di codice (JavaScript)
// A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).
var dict = ee.Dictionary({
B1: 182,
B2: 219,
B3: 443
});
print('Value for "B1" key', dict.get('B1'));
// Set a default value for the case where the key does not exist.
print('Value for nonexistent "Band_1" key',
dict.get({key: 'Band_1', defaultValue: -9999}));
Configurazione di Python
Consulta la pagina
Ambiente Python per informazioni sull'API Python e sull'utilizzo di
geemap per lo sviluppo interattivo.
import ee
import geemap.core as geemap
Colab (Python)
# A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).
dic = ee.Dictionary({
'B1': 182,
'B2': 219,
'B3': 443
})
print('Value for "B1" key:', dic.get('B1').getInfo())
# Set a default value for the case where the key does not exist.
print('Value for nonexistent "Band_1" key:',
dic.get(**{'key': 'Band_1', 'defaultValue': -9999}).getInfo())
Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
Ultimo aggiornamento 2025-07-26 UTC.
[null,null,["Ultimo aggiornamento 2025-07-26 UTC."],[[["\u003cp\u003eThe \u003ccode\u003eDictionary.get()\u003c/code\u003e method extracts the value associated with a specified key from a dictionary.\u003c/p\u003e\n"],["\u003cp\u003eIf the key is not found in the dictionary, the method returns a user-defined default value.\u003c/p\u003e\n"],["\u003cp\u003eA null default value can be specified, resulting in a null return if the key is absent.\u003c/p\u003e\n"],["\u003cp\u003eThis function is applicable across different Earth Engine environments, including JavaScript, Python, and Colab.\u003c/p\u003e\n"]]],["The `get` method retrieves a value from a dictionary using a specified key. If the key exists, its corresponding value is returned. If the key is absent, a `defaultValue` is returned. The `defaultValue` can be customized, defaulting to `null` if not provided. Usage examples demonstrate retrieving existing values and setting default values for nonexistent keys, in both JavaScript and Python. The `get` method is applicable to dictionary objects.\n"],null,["# ee.Dictionary.get\n\nExtracts a named value from a dictionary. If the dictionary does not contain the given key, then defaultValue is returned, unless it is null.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------|---------|\n| Dictionary.get`(key, `*defaultValue*`)` | Object |\n\n| Argument | Type | Details |\n|--------------------|-----------------------|---------|\n| this: `dictionary` | Dictionary | |\n| `key` | String | |\n| `defaultValue` | Object, default: null | |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).\nvar dict = ee.Dictionary({\n B1: 182,\n B2: 219,\n B3: 443\n});\n\nprint('Value for \"B1\" key', dict.get('B1'));\n\n// Set a default value for the case where the key does not exist.\nprint('Value for nonexistent \"Band_1\" key',\n dict.get({key: 'Band_1', defaultValue: -9999}));\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# A dictionary (e.g. results of ee.Image.reduceRegion of an S2 image).\ndic = ee.Dictionary({\n 'B1': 182,\n 'B2': 219,\n 'B3': 443\n})\n\nprint('Value for \"B1\" key:', dic.get('B1').getInfo())\n\n# Set a default value for the case where the key does not exist.\nprint('Value for nonexistent \"Band_1\" key:',\n dic.get(**{'key': 'Band_1', 'defaultValue': -9999}).getInfo())\n```"]]
