Update Counter collection in python with string, not letter Question: How to update a Counter with a string, not the letters of the string? For example, after initializing this counter with two strings: from collections import Counter c = Counter([‘black’,’blue’]) “add” to it another string such as ‘red’. When I use the update() method it …
How do I get the size of a boto3 Collection? Question: The way I have been using is to transform the Collection into a List and query the length: s3 = boto3.resource(‘s3’) bucket = s3.Bucket(‘my_bucket’) size = len(list(bucket.objects.all())) However, this forces resolution of the whole collection and obviates the benefits of using a Collection in …
turning a collections counter into dictionary Question: I have a collection outcome resulting from the function: Counter(df.email_address) it returns each individual email address with the count of its repetitions. Counter({nan: 1618, ‘[email protected]’: 265, ‘[email protected]’: 1}) what I want to do is to use it as if it was a dictionary and create a pandas dataframe …
What's the difference between the square bracket and dot notations in Python? Question: I come from a Javascript background (where properties can be accessed through both . and [] notation), so please forgive me, but what, exactly, is the difference between the two in Python? From my experimentation it seeems that [] should always be …
How to convert defaultdict of defaultdicts [of defaultdicts] to dict of dicts [of dicts]? Question: Using this answer, I created a defaultdict of defaultdicts. Now, I’d like to turn that deeply nested dict object back into an ordinary python dict. from collections import defaultdict factory = lambda: defaultdict(factory) defdict = factory() defdict[‘one’][‘two’][‘three’][‘four’] = 5 # …
What is the purpose of collections.ChainMap? Question: In Python 3.3 a ChainMap class was added to the collections module: A ChainMap class is provided for quickly linking a number of mappings so they can be treated as a single unit. It is often much faster than creating a new dictionary and running multiple update() calls. …
Changing order of ordered dictionary in python Question: I have an ordered dictionary and want to change the individual order. In the below code example I want to item 3 (people), along with its values, to move to position 2. So the order will be animals, people, food, drinks. How do I go about his? …
How to sort Counter by value? – python Question: Other than doing list comprehensions of reversed list comprehension, is there a pythonic way to sort Counter by value? If so, it is faster than this: >>> from collections import Counter >>> x = Counter({‘a’:5, ‘b’:3, ‘c’:7}) >>> sorted(x) [‘a’, ‘b’, ‘c’] >>> sorted(x.items()) [(‘a’, 5), …
How to check if a tuple contains an element in Python? Question: I tried to find the available methods but couldn’t find it. There is no contains. Should I use index? I just want to know if the item exists, don’t need the index of it. Asked By: Joan Venge || Source Answers: You use …
Is there a short contains function for lists? Question: Given a list xs and a value item, how can I check whether xs contains item (i.e., if any of the elements of xs is equal to item)? Is there something like xs.contains(item)? For performance considerations, see Fastest way to check if a value exists in …
