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I am new to programming and I'm trying to extract values from the Amazon MWS API. It returns the biggest nested dictionary I've seen and I'm having trouble figuring out how to loop through it to find the value I need.
Example:
{'Products': {'Product': {'AttributeSets': {'ItemAttributes': {'Binding': {'value': 'Video '
'Game'},
'Brand': {'value': 'Nintendo'},
'Color': {'value': 'blue'},
'ESRBAgeRating': {'value': 'Everyone'},
'HardwarePlatform': {'value': 'Android/iOS'},
'IsAdultProduct': {'value': 'false'},
'ItemDimensions': {'Height': {'Units': {'value': 'inches'},
'value': '5.00'},
'Length': {'Units': {'value': 'inches'},
'value': '5.00'},
'Weight': {'Units': {'value': 'pounds'},
'value': '0.10'},
'Width': {'Units': {'value': 'inches'},
'value': '2.00'}},
'Label': {'value': 'Nintendo'},
'Languages': {'Language': {'Name': {'value': 'english'},
'Type': {'value': 'Unknown'}}},
'ListPrice': {'Amount': {'value': '34.99'},
'CurrencyCode': {'value': 'USD'}},
'Manufacturer': {'value': 'Nintendo'},
'Model': {'value': 'PMCAPBAA'},
'OperatingSystem': [{'value': 'Not '
'Machine '
'Specific'},
{'value': 'Android/iOS'}],
'PackageDimensions': {'Height': {'Units': {'value': 'inches'},
'value': '1.00'},
'Length': {'Units': {'value': 'inches'},
'value': '5.10'},
'Weight': {'Units': {'value': 'pounds'},
'value': '0.04'},
'Width': {'Units': {'value': 'inches'},
'value': '2.90'}},
'PackageQuantity': {'value': '1'},
'PartNumber': {'value': 'PMCAPBAA'},
'Platform': [{'value': 'Not '
'Machine '
'Specific'},
{'value': 'Android'},
{'value': 'iOS'},
{'value': 'Nintendo '
'Wii'}],
'ProductGroup': {'value': 'Video '
'Games'},
'ProductTypeName': {'value': 'VIDEO_GAME_ACCESSORIES'},
'Publisher': {'value': 'Nintendo'},
'ReleaseDate': {'value': '2016-09-16'},
'SmallImage': {'Height': {'Units': {'value': 'pixels'},
'value': '75'},
'URL': {'value': 'http://ecx.images-amazon.com/images/I/41%2B1-PwEz4L._SL75_.jpg'},
'Width': {'Units': {'value': 'pixels'},
'value': '75'}},
'Studio': {'value': 'Nintendo'},
'Title': {'value': 'Nintendo '
'Pokemon '
'Go '
'Plus'},
'lang': {'value': 'en-US'}}},
'Identifiers': {'MarketplaceASIN': {'ASIN': {'value': 'B01H482N6E'},
'MarketplaceId': {'value': 'ATVPDKIKX0DER'}}},
'Relationships': {},
'SalesRankings': {'SalesRank': [{'ProductCategoryId': {'value': 'video_games_display_on_website'},
'Rank': {'value': '35'}},
{'ProductCategoryId': {'value': '14218821'},
'Rank': {'value': '1'}},
{'ProductCategoryId': {'value': '471304'},
'Rank': {'value': '22'}}]}}}}
How can I find the value of 'Title' or what would be the best way to find the value 'Title' from this dictionary?
When I try to implement similar recursive solutions I found on Stackoverflow, I get a None value.
I've tried:
def recursive_lookup(k, d):
if k in d:
return d[k]
for v in d.values():
if isinstance(v, dict):
return recursive_lookup(k, v)
return None
print(recursive_lookup('Title', productData.parsed))
946
Check If Key Exists using has_key() method Using has_key() method returns true if a given key is available in the dictionary, otherwise, it returns a false. With the Inbuilt method has_key(), use the if statement to check if the key is present in the dictionary or not.
To access element of a nested dictionary, we use indexing [] syntax in Python.
Another way to access value(s) in a nested dictionary ( employees ) is to use the dict. get() method. This method returns the value for a specified key. If the specified key does not exist, the get() method returns None (preventing a KeyError ).
To simply check if a key exists in a Python dictionary you can use the in operator to search through the dictionary keys like this: pets = {'cats': 1, 'dogs': 2, 'fish': 3} if 'dogs' in pets: print('Dogs found!') # Dogs found! A dictionary can be a convenient data structure for counting the occurrence of items.
The problem with your code is that you are not backtracking to other dictionaries. You don't loop through all the items before you return. By returning you cut off your loop.
The code below loops through all of the dicts and doesn't return until it has either found the key or it has checked all the dicts and found nothing.
def recursive_lookup(k, d):
if k in d: return d[k]
for v in d.values():
if isinstance(v, dict):
a = recursive_lookup(k, v)
if a is not None: return a
return None
You can use dict.items at each recursive call:
def get_value(d, target = 'Title'):
val = filter(None, [[b] if a == target else get_value(b) if isinstance(b, dict) else None for a, b in d.items()])
return [i for b in val for i in b]
print(get_value(structure))
Output:
[{'value': 'Nintendo Pokemon Go Plus'}]
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