我最近才进入API请求，在请求了一些信息后，我在许多词典中获取了很多数据，基本上是这样的，我想组织和仅打印下载URL，谢谢您的帮助。
这里是json的示例：
{
'errorCode': None,
'error': '',
'data': {
'numberReturned': 10,
'totalHits': 388958,
'firstRecord': 1,
'lastRecord': 10,
'nextRecord': 11,
'results': [{
'acquisitionDate': '2013-03-08',
'startTime': '2013-03-08',
'endTime': '2013-03-08',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[-130.96631, 52.48409],
[-128.40618, 52.04284],
[-127.5665, 53.69859],
[-130.22375, 54.15318],
[-130.96631, 52.48409]
]
]
},
'sceneBounds': '-130.96631,52.04284,-127.5665,54.15318',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/052/023/LT08_L1GT_052023_20130308_20170505_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT80520232013067LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80520232013067LGN02/INVSVC/',
'entityId': 'LT80520232013067LGN02',
'displayId': 'LT08_L1GT_052023_20130308_20170505_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT80520232013067LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT80520232013067LGN02/save_xml',
'modifiedDate': '2017-05-05',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_052023_20130308_20170505_01_T2, Acquisition Date: 08-MAR-13, Path: 52, Row: 23'
}, {
'acquisitionDate': '2013-03-08',
'startTime': '2013-03-08',
'endTime': '2013-03-08',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[-131.56161, 51.07001],
[-129.07552, 50.63805],
[-128.28062, 52.29816],
[-130.85695, 52.74239],
[-131.56161, 51.07001]
]
]
},
'sceneBounds': '-131.56161,50.63805,-128.28062,52.74239',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/052/024/LT08_L1GT_052024_20130308_20170505_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT80520242013067LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80520242013067LGN02/INVSVC/',
'entityId': 'LT80520242013067LGN02',
'displayId': 'LT08_L1GT_052024_20130308_20170505_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT80520242013067LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT80520242013067LGN02/save_xml',
'modifiedDate': '2017-05-05',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_052024_20130308_20170505_01_T2, Acquisition Date: 08-MAR-13, Path: 52, Row: 24'
}, {
'acquisitionDate': '2013-03-08',
'startTime': '2013-03-08',
'endTime': '2013-03-08',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[-132.12903, 49.65182],
[-129.71182, 49.22835],
[-128.95719, 50.89234],
[-131.45832, 51.32713],
[-132.12903, 49.65182]
]
]
},
'sceneBounds': '-132.12903,49.22835,-128.95719,51.32713',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/052/025/LT08_L1GT_052025_20130308_20170505_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT80520252013067LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80520252013067LGN02/INVSVC/',
'entityId': 'LT80520252013067LGN02',
'displayId': 'LT08_L1GT_052025_20130308_20170505_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT80520252013067LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT80520252013067LGN02/save_xml',
'modifiedDate': '2017-05-05',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_052025_20130308_20170505_01_T2, Acquisition Date: 08-MAR-13, Path: 52, Row: 25'
}, {
'acquisitionDate': '2013-03-08',
'startTime': '2013-03-08',
'endTime': '2013-03-08',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[-164.20358, 23.86964],
[-162.48625, 23.52277],
[-162.05927, 25.23064],
[-163.80043, 25.58141],
[-164.20358, 23.86964]
]
]
},
'sceneBounds': '-164.20358,23.52277,-162.05927,25.58141',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/068/043/LT08_L1GT_068043_20130308_20170505_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT80680432013067LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80680432013067LGN02/INVSVC/',
'entityId': 'LT80680432013067LGN02',
'displayId': 'LT08_L1GT_068043_20130308_20170505_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT80680432013067LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT80680432013067LGN02/save_xml',
'modifiedDate': '2017-05-05',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_068043_20130308_20170505_01_T2, Acquisition Date: 08-MAR-13, Path: 68, Row: 43'
}, {
'acquisitionDate': '2013-03-08',
'startTime': '2013-03-08',
'endTime': '2013-03-08',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[-164.53819, 22.4285],
[-162.83937, 22.08332],
[-162.4197, 23.79243],
[-164.14054, 24.14135],
[-164.53819, 22.4285]
]
]
},
'sceneBounds': '-164.53819,22.08332,-162.4197,24.14135',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/068/044/LT08_L1GT_068044_20130308_20170505_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT80680442013067LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80680442013067LGN02/INVSVC/',
'entityId': 'LT80680442013067LGN02',
'displayId': 'LT08_L1GT_068044_20130308_20170505_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT80680442013067LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT80680442013067LGN02/save_xml',
'modifiedDate': '2017-05-05',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_068044_20130308_20170505_01_T2, Acquisition Date: 08-MAR-13, Path: 68, Row: 44'
}, {
'acquisitionDate': '2013-03-08',
'startTime': '2013-03-08',
'endTime': '2013-03-08',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[-164.86886, 20.98582],
[-163.18712, 20.6422],
[-162.77413, 22.35249],
[-164.47616, 22.69974],
[-164.86886, 20.98582]
]
]
},
'sceneBounds': '-164.86886,20.6422,-162.77413,22.69974',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/068/045/LT08_L1GT_068045_20130308_20170505_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT80680452013067LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80680452013067LGN02/INVSVC/',
'entityId': 'LT80680452013067LGN02',
'displayId': 'LT08_L1GT_068045_20130308_20170505_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT80680452013067LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT80680452013067LGN02/save_xml',
'modifiedDate': '2017-05-05',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_068045_20130308_20170505_01_T2, Acquisition Date: 08-MAR-13, Path: 68, Row: 45'
}, {
'acquisitionDate': '2013-03-08',
'startTime': '2013-03-08',
'endTime': '2013-03-08',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[79.72568, 15.2114],
[81.3526, 14.87269],
[81.74391, 16.58657],
[80.103, 16.92848],
[79.72568, 15.2114]
]
]
},
'sceneBounds': '79.72568,14.87269,81.74391,16.92848',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/142/049/LT08_L1GT_142049_20130308_20170505_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT81420492013067LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT81420492013067LGN02/INVSVC/',
'entityId': 'LT81420492013067LGN02',
'displayId': 'LT08_L1GT_142049_20130308_20170505_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT81420492013067LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT81420492013067LGN02/save_xml',
'modifiedDate': '2017-05-05',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_142049_20130308_20170505_01_T2, Acquisition Date: 08-MAR-13, Path: 142, Row: 49'
}, {
'acquisitionDate': '2013-03-08',
'startTime': '2013-03-08',
'endTime': '2013-03-08',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[79.41052, 13.76653],
[81.02677, 13.42875],
[81.41387, 15.1434],
[79.78508, 15.4843],
[79.41052, 13.76653]
]
]
},
'sceneBounds': '79.41052,13.42875,81.41387,15.4843',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/142/050/LT08_L1GT_142050_20130308_20170505_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT81420502013067LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT81420502013067LGN02/INVSVC/',
'entityId': 'LT81420502013067LGN02',
'displayId': 'LT08_L1GT_142050_20130308_20170505_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT81420502013067LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT81420502013067LGN02/save_xml',
'modifiedDate': '2017-05-05',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_142050_20130308_20170505_01_T2, Acquisition Date: 08-MAR-13, Path: 142, Row: 50'
}, {
'acquisitionDate': '2013-03-09',
'startTime': '2013-03-09',
'endTime': '2013-03-09',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[-120.15339, 38.24051],
[-118.15904, 37.86641],
[-117.61337, 39.55749],
[-119.65581, 39.938],
[-120.15339, 38.24051]
]
]
},
'sceneBounds': '-120.15339,37.86641,-117.61337,39.938',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/042/033/LT08_L1GT_042033_20130309_20170310_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT80420332013068LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80420332013068LGN02/INVSVC/',
'entityId': 'LT80420332013068LGN02',
'displayId': 'LT08_L1GT_042033_20130309_20170310_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT80420332013068LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT80420332013068LGN02/save_xml',
'modifiedDate': '2017-03-10',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_042033_20130309_20170310_01_T2, Acquisition Date: 09-MAR-13, Path: 42, Row: 33'
}, {
'acquisitionDate': '2013-03-09',
'startTime': '2013-03-09',
'endTime': '2013-03-09',
'spatialFootprint': {
'type': 'Polygon',
'coordinates': [
[
[-120.56102, 36.80643],
[-118.60521, 36.4365],
[-118.07638, 38.1302],
[-120.07712, 38.50615],
[-120.56102, 36.80643]
]
]
},
'sceneBounds': '-120.56102,36.4365,-118.07638,38.50615',
'browseUrl': 'https://ims.cr.usgs.gov/browse/landsat_8_c1/2013/042/034/LT08_L1GT_042034_20130309_20170310_01_T2.jpg',
'dataAccessUrl': 'https://earthexplorer.usgs.gov/order/process?dataset_name=LANDSAT_8_C1&ordered=LT80420342013068LGN02&node=INVSVC',
'downloadUrl': 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80420342013068LGN02/INVSVC/',
'entityId': 'LT80420342013068LGN02',
'displayId': 'LT08_L1GT_042034_20130309_20170310_01_T2',
'cloudCover': None,
'metadataUrl': 'https://earthexplorer.usgs.gov/metadata/xml/12864/LT80420342013068LGN02/',
'fgdcMetadataUrl': 'https://earthexplorer.usgs.gov/fgdc/12864/LT80420342013068LGN02/save_xml',
'modifiedDate': '2017-03-10',
'orderUrl': None,
'bulkOrdered': False,
'ordered': False,
'summary': 'Entity ID: LT08_L1GT_042034_20130309_20170310_01_T2, Acquisition Date: 09-MAR-13, Path: 42, Row: 34'
}]
},
'api_version': '1.4.0',
'access_level': 'user',
'catalog_id': 'EE',
'executionTime': 208.667964220047
}
如何获取大型词典中许多词典中的所有数据？
字典被嵌套在Python中，只需一次访问字典键：
data = { .. your big data file ...}
download_urls = [result['downloadUrl'] for result in data['data']['results']]
print(download_urls) # ['https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80520232013067LGN02/INVSVC/', 'https://earthexplorer.usgs.gov/download/external/options/LANDSAT_8_C1/LT80520242013067LGN02/INVSVC
下面第一行之后，您将拥有一个包含所有数据的词典。我在其下面添加了代码，以打印出所有URL：
>>> exec(f"d = {open('/Users/todd/projects/landsat/landsat.json', 'r').read()}")
>>>
>>> def print_urls(o, k=None):
... ot = type(o)
... if ot is list:
... for li in o:
... print_urls(li)
... elif ot is dict:
... for k, v in o.items():
... print_urls(v, k)
... elif ot is str and o.startswith("http"):
... if k:
... print(f"{k}: {o}")
... else:
... print(o)
...
>>> print_urls(d)
如果您想使这本词典扁平化，我不知道是否可行，因为其中嵌套了许多同名的键。