Apr 8, 2010 · 2220 Given a single item, how do I count occurrences of it in a list, in Python? A related but different problem is counting occurrences of each different element in a collection, …

How do I count the number of occurrences of a character in a string? e.g. 'a' appears in 'Mary had a little lamb' 4 times.

118 Python 2.7+ introduces Dictionary Comprehension. Building the dictionary from the list will get you the count as well as get rid of duplicates.

Apr 11, 2013 · 172 How do I get the row count of a Pandas DataFrame? This table summarises the different situations in which you'd want to count something in a DataFrame (or Series, for …

Sep 17, 2012 · I have a Python list and I want to know what's the quickest way to count the number of occurrences of the item, '1' in this list. In my actual case, the item can occur tens of …

Dec 24, 2016 · How do I count the number of 0 s and 1 s in the following array?

Oct 25, 2014 · list.count() counts how many times the given value appears. You created a list of 5 elements that are all the same, so of course x_list.count() finds that element 5 times in a list of …

How can I count the number of times a given substring is present within a string in Python? For example:

df.groupby('a').count() doesn't work if you have multiple columns. It will give you a ncol x nvals dataframe. That's nice when you only have one column, but when you have 10's or 100's of …

Mar 21, 2023 · How do I count tokens before (!) I send an API request? As stated in the official OpenAI article: To further explore tokenization, you can use our interactive Tokenizer tool, …