Python >= 3.5 alternative: unpack into a list literal [*newdict] New unpacking generalizations (PEP 448) were introduced with Python 3.5 allowing you to now easily do: >>> newdict = {1:0, 2:0, …

14 Iúil 2013 · On Python 3, use dct.keys() to get a dictionary view object, which lets you do set operations on just the keys: >>> for sharedkey in dct1.keys() & dct2.keys(): # intersection of two …

26 Ean 2017 · From python 3.7.4 manual: "Performing list (d) on a dictionary returns a list of all the keys used in the dictionary, in insertion order". So insertion order is something which is …

Especially for a large dict, note that this solution is far less efficient than the answer Python reverse / invert a mapping because it loops over items() multiple times.

21 Iúil 2010 · In Python 3, the iteration has to be over an explicit copy of the keys (otherwise it throws a RuntimeError) because my_dict.keys() returns a view of the dictionary keys, so any …

dict.keys() is a dictionary view. Just use list() directly on the dictionary instead if you need a list of keys, item 0 will be the first key in the (arbitrary) dictionary order:

I wanted to test if a key exists in a dictionary before updating the value for the key. I wrote the following code: if 'key1' in dict.keys(): print "blah" else: print "boo" I think this is not...

In Python 3, the dict.keys() method returns a dictionary view object, which acts as a set. Iterating over the dictionary directly also yields keys, so turning a dictionary into a list results in a list of …

6 Lún 2010 · I use more simple syntax which also works for old python (tested on 2.4.3): dict((x, mydict[x]) for x in mylist if x in mydict). Here mylist is the desirable subset of keys.

1 MFómh 2010 · Further clarification In Python 3, keys() returns a dict_keys object but if we use it in a for loop context for k in d.keys() then an iterator is implicitly created. So the difference …