Pengumuman: Semua project nonkomersial yang terdaftar untuk menggunakan Earth Engine sebelum
15 April 2025 harus
memverifikasi kelayakan nonkomersial untuk mempertahankan akses Earth Engine.
ee.Dictionary.get
Tetap teratur dengan koleksi
Simpan dan kategorikan konten berdasarkan preferensi Anda.
Mengekstrak nilai bernama dari kamus. Jika kamus tidak berisi kunci yang diberikan, defaultValue akan ditampilkan, kecuali jika null.
| Penggunaan | Hasil |
|---|
Dictionary.get(key, defaultValue) | Objek |
| Argumen | Jenis | Detail |
|---|
ini: dictionary | Kamus | |
key | String | |
defaultValue | Objek, default: null | |
Contoh
Code Editor (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}));
Penyiapan Python
Lihat halaman
Lingkungan Python untuk mengetahui informasi tentang Python API dan penggunaan
geemap untuk pengembangan interaktif.
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())
Kecuali dinyatakan lain, konten di halaman ini dilisensikan berdasarkan Lisensi Creative Commons Attribution 4.0, sedangkan contoh kode dilisensikan berdasarkan Lisensi Apache 2.0. Untuk mengetahui informasi selengkapnya, lihat Kebijakan Situs Google Developers. Java adalah merek dagang terdaftar dari Oracle dan/atau afiliasinya.
Terakhir diperbarui pada 2025-07-26 UTC.
[null,null,["Terakhir diperbarui pada 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```"]]
