Apr 8, 2010 · 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, getting …

The python cProfile and pstats modules offer great support for measuring time elapsed in certain functions without having to add any code around the existing functions.

Feb 12, 2014 · Voilà! This works because a Python function "knows" itself (this is a necessary feature, so that functions can call themselves recursively if desired). If you wish to keep some …

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.

The python groupby creates new groups when the value it sees changes. In this case 1,1,1,2,1,1,1] would return [3,1,3]. If you expected [6,1] then just be sure to sort the data …

Python newb here. I m trying to count the number of letter "a"s in a given string. Code is below. It keeps returning 1 instead 3 in string "banana". Any input appreciated. def count_letters(word,...

Jun 29, 2017 · The function simply returns this counter. In the end, the time complexity of list_count is O (n). Just make sure that your objects don't have __eq__ functions with large …

Using the assignment operator introduced in Python 3.8, we can write a short function that uses str.find() in a loop to find overlapping instances of a target substring within a string.

May 11, 2009 · 263 How can I find the number of arguments of a Python function? I need to know how many normal arguments it has and how many named arguments. Example: def …

I'm thinking I just need to provide a function that returns the count of distinct items of a Series object to the aggregate function, but I don't have a lot of exposure to the various libraries at my …