The power of this function can also be utilized to perform this task. GetFromDict(dataDict, mapList)] = valueĪll but the last element in mapList is needed to find the 'parent' dictionary to add the value to, then use the last element to set the value to the right key. Method 4: Using enumerate() Python also offers enumerate() with helps to iterate over all kinds of containers, be it dictionary or a list. A list of dictionaries is a Python list in which every element is a dictionary. Return reduce(operator.getitem, mapList, dataDict)Īnd reuse getFromDict to find the location to store the value for setInDict(): def setInDict(dataDict, mapList, value): of Python dictionaries and learn how to access and manage dictionary data. This 'magic' is known as list comprehension. If value is not present as key, it will simply return 'alt'. Then, it will look like: d.get ('value', 'alt') for d in l. If the key ‘gfg’ is in the dictionary, get its value and append it to the list res. One of the simplest ways Ive found is to parse the dictionary as a list. Assuming every dict has a value key, you can write (assuming your list is named l) To treat missing value for a key, one may also use d.get ('keytolookup', 'alternatevalue'). For each dictionary d in testlist, check if the key ‘gfg’ is in the dictionary. Use list comprehension to create a new list res. Use reduce() to traverse the dictionary: from functools import reduce # forward compatibility for Python 3 Step-by-step approach: Create a list testlist containing dictionaries with key-value pairs.
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