I have a python dictionary dict1 with more than 20,000 keys and i want to update it with another dictionary dict2. the dictionaries look like this: the dictionaries look like this: dict1 key11=>[value11] key12=>[value12]. I have a python list which contains dictionaries and i want to make a new list which contain dictionaries with unique keys and associated list values like below:. Properties of dictionary keys. dictionary values have no restrictions. they can be any arbitrary python object, either standard objects or user-defined objects. however, same is not true for the keys. there are two important points to remember about dictionary keys − (a) more than one entry per key not allowed. which means no duplicate key is.
The update() method updates the dictionary with the elements from the another dictionary object or from an iterable of key/value pairs. the update() method adds element(s) to the dictionary if the key is not in the dictionary.. The method update() adds dictionary dict2's key-values pairs in to dict. this function does not return anything. syntax. following is the syntax for update() method − dict.update(dict2) parameters. dict2 − this is the dictionary to be added into dict. return value. this method does not return any value. example. However, there are a couple restrictions that dictionary keys must abide by. first, a given key can appear in a dictionary only once. duplicate keys are not allowed. a dictionary maps each key to a corresponding value, so it doesn’t make sense to map a particular key more than once..
