I need to implement a function that returns a list containing every other element of the source list, starting with the first element. Thus far, I have this and I am not sure how to do from here: def altElement(a): b = [] for i in a: b.append(a) print b

If the condition you want to check is "is found in another container", see How to check if all of the following items are in a list? and its counterpart, How to check if one of the following items is in a list?.

Aug 21, 2013 · How to iterate over a Row or Column of an Excel sheet using Python and look for specific value in cells?

Jul 24, 2021 · To get every other element in a Python list you can use the slice operator and use the fact that this operator allows to provide a step argument (with its extended syntax). Another approach is to use the mathematical concept of remainder and apply it to list indexes.

Nov 30, 2023 · Below are the ways by which we can iterate over columns of Dataframe in Python Pandas: Using Dataframe.iteritems() Using [ ] operator; Iterate over more than one column; Iterating columns in reverse order ; Using iloc[] Pandas Iterate Over Columns of DataFrame u sing DataFrame.iteritems():

Pandas DataFrame has methods all() and any() to check whether all or any of the elements across an axis(i.e., row-wise or column-wise) is True. all () does a logical AND operation on a row or column of a DataFrame and returns the resultant Boolean value.

Sep 28, 2019 · If however you just want to check if some of the rows contain a string, that has a special format (like a date), you can check this with a regex like: df['ABC'].str.match('[0-9]{4}-[0-9]{2}-[0-9]{2}')

Oct 4, 2022 · I have a variable and I want to see if it matches any of the cells in a column in this example I want to check the column B. Let's say: var = 2…

1 day ago · This second code block performs several important operations: 1. Loads the existing workbook we created in the previous step 2. Adds a new column header to Warehouse_A called “Available in Warehouse B” 3. Creates a list of all products currently available in Warehouse_B 4.

Apr 8, 2019 · First we will learn how to work with CSV files by reading, writing and updating them. Then we will take a look how to read files, filter them by sheets, search for rows/columns, and update cells of xlsx files. Let’s start with the simplest spreadsheet format: CSV.