It just uses the Python function array.index() and with a simple Try / Except, it returns the position of the record if it is found in the list and returns -1 if it is not found in the list (like in JavaScript with the …

Negative numbers mean that you count from the right instead of the left. So, list[-1] refers to the last element, list[-2] is the second-last, and so on.

Python's enumerate function reduces the visual clutter by hiding the accounting for the indexes, and encapsulating the iterable into another iterable (an enumerate object) that yields a two-item tuple of …

Nov 28, 2013 · An index, in your example, refers to a position within an ordered list. Python strings can be thought of as lists of characters; each character is given an index from zero (at the beginning) to …

I have a dataframe from which I remove some rows. As a result, I get a dataframe in which index is something like [1,5,6,10,11] and I would like to reset it to [0,1,2,3,4]. How can I do it? The

Nov 7, 2016 · I have the following dataframes: > df1 id begin conditional confidence discoveryTechnique 0 278 56 false 0.0 1 1 421 18 false 0.0 ...

Dec 13, 2016 · How do I remove an element from a list by index? I found list.remove(), but this slowly scans the list for an item by value.

Oct 16, 2015 · Take the following data-frame: x = np.tile(np.arange(3),3) y = np.repeat(np.arange(3),3) df = pd.DataFrame({"x": x, "y": y}) x y 0 0 0 1 1 0 2 2 0 3 0 1 4 1 1 5 2 1 6 ...

Mar 19, 2010 · I'm using Python's max and min functions on lists for a minimax algorithm, and I need the index of the value returned by max() or min(). In other words, I need to know which move produced …

Oct 5, 1985 · I've a csv file without header, with a DateTime index. I want to rename the index and column name, but with df.rename() only the column name is renamed. Bug? I'm on version 0.12.0 In …