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Python - Modify dictionary from function


Python - Modify dictionary from function

By : Sasi
Date : November 21 2020, 11:01 PM
I hope this helps . Your a = {} statement inside the function was never being executed; every possible path of execution reaches a return before then. If it WAS executed, you wouldn't have liked the results - it would have executed in every single recursive call to the function, meaning that your dictionary would never hold more than one item! You would somehow have to detect the outermost call and only clear the dict there, or (much simpler) clear it outside of the recursion as in your second example.
Note that much of the size of your dictionary is coming from the strange decision to use a long string key. Keying it with the number itself (as in a[n] = z) would make it much more compact.
code :


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Python - Dictionary - Modify __getitem__?

Python - Dictionary - Modify __getitem__?


By : Ali A. Othman
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The fact is that when Python encounters an expression such as data["key"]["subkey"], what is done internally is (data["key"])["subkey"]. That is, the first part of the expression is resolved: the retrievalof the item "key" from the object "data". Then, Python tries do call __getitem__ on the resulting object of that expression. If such resulting object does not have a __getitem__method itself, there is your error.
There are two possible workarounds there: you should either work with "tuple indexes" - like data["key", "subkey"](and then test on your __getitem__ method wether you got a tuple instance as the key) - or make __getitem__ return an specialized object that also features a __getitem__ method - even if all it does is to log the requested keys.
Python modify dictionary recursively

Python modify dictionary recursively


By : Emiel den Oude
Date : March 29 2020, 07:55 AM
should help you out I have a Python AST parser that converts expressions like 1==1 or 2==2 or 3==3 into this dictionary: , You could do something like this:
code :
def _nest_ors(args):
    assert len(args) >= 2

    if len(args) == 2:
        return {
            'function': 'or',
            'args': args
        }

    return {
        'function': 'or',
        'args': [args[0], _nest_ors(args[1:])]
    }


def fix_ors(ast):
    assert ast['function'] == 'or'

    return _nest_ors(ast['args'])


expression = {'args': [{'args': [{'value': 1}, {'value': 1}], 'function': '=='},
                       {'args': [{'value': 2}, {'value': 2}], 'function': '=='},
                       {'args': [{'value': 3}, {'value': 3}], 'function': '=='}],
              'function': 'or'}

print(fix_ors(expression))
Modify dictionary in Python

Modify dictionary in Python


By : ENT108
Date : March 29 2020, 07:55 AM
will help you You can't change a string dictionary key directly in the way you have presented. The reason for this is that the key itself- which again, is a string, or str object- is immutable. This would not necessarily be true for other types of keys, such as for a user-defined object.
Your only option is to add the new key to the existing dictionary, or create a new dictionary with the key you want.
code :
DATA = {'XX': DATA['records']}
DATA['XX'] = DATA['records']
DATA['XX'] = DATA['records']
del DATA['records']
DATA['XX'] = DATA.pop('records')
How to modify or create a dictionary based on one dictionary querying the values of another dictionary in Python

How to modify or create a dictionary based on one dictionary querying the values of another dictionary in Python


By : Irwan Abdullah AlMun
Date : March 29 2020, 07:55 AM
I wish this helpful for you I have two dictionaries: Dictionary A has an increasing and unique Item ID as the key and it is associated to an FID value. , try this code:
code :
dict_a = dict({11111: "FID01", 22222: "FID01", 33333:"FID03", 44444: "FID01"} )
dict_b = dict({"FID01": 25, "FID02": 50, "FID03": 75, "FID04": 90})

dict_b_keys = dict_b.keys()

{key: dict_b[value] for (key, value) in dict_a.items() if value in dict_b_keys}
In Python, how do you create a new function that will modify an existing dictionary?

In Python, how do you create a new function that will modify an existing dictionary?


By : David Washington
Date : March 29 2020, 07:55 AM
This might help you Python functions use pass-by reference, so you can freely modify a passed-in dictionary. You don't have to do anything special:
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