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I have the following procedure:
def myProc(invIndex, keyWord): D={} for i in range(len(keyWord)): if keyWord[i] in invIndex.keys(): D.update(invIndex[query[i]]) return D But I am getting the following error:
Traceback (most recent call last): File "<stdin>", line 3, in <module> TypeError: cannot convert dictionary update sequence element #0 to a sequence I do not get any error if D contains elements. But I need D to be empty at the beginning.
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Once a set is created, you cannot change its items, but you can add new items. To add one item to a set use the add() method.
To add multiple elements at once we use the Set update() method. It takes an iterable(list, tuple, dictionary) as an argument. We can add single or multiply iterable in the set using the Update() method.
To create an empty set in python we have to use the set() function without any arguments, if we will use empty curly braces ” {} ” then we will get an empty dictionary. After writing the above code (create an empty set in python), Ones you will print “type(x)” then the output will appear as a “ <class 'set'> ”.
Set is an unordered collection, so added elements can be in any order. The add() method can add a tuple object as an element in the set, as shown below. Note that you can add the same tuple only once as in the case of other elements. Lists and Dictionaries cannot be added to the set because they are unhashable.
D = {} is a dictionary not set.
>>> d = {} >>> type(d) <type 'dict'> Use D = set():
>>> d = set() >>> type(d) <type 'set'> >>> d.update({1}) >>> d.add(2) >>> d.update([3,3,3]) >>> d set([1, 2, 3]) 
>>> d = {} >>> D = set() >>> type(d) <type 'dict'> >>> type(D) <type 'set'> What you've made is a dictionary and not a Set.
The update method in dictionary is used to update the new dictionary from a previous one, like so,
>>> abc = {1: 2} >>> d.update(abc) >>> d {1: 2} Whereas in sets, it is used to add elements to the set.
>>> D.update([1, 2]) >>> D set([1, 2]) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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