Python Read File Into List

In this tutorial we are going to see how we can read a file and store the content of the file into a python list. While working with python many a times data is stored into text files or csv files and to use that data into our code it must be brought to the python code. In this tutorial we will see different methods on how it can be done efficiently and with as little code as possible. Python Read File Into List Using with Keyword We can use…

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Programming 

Python List count()

This tutorial shows you everything you need to know to help you master the essential count() method of the most fundamental container data type in the Python programming language. Definition and Usage: The list.count(x) method counts the number of occurrences of the element x in the list. Here’s a short example: >>> lst = [1, 2, 42, 2, 1, 42, 42] >>> lst.count(42) 3 >>> lst.count(2) 2 In the first line of the example, you create the list lst. You then count the number of times the integer values 42…

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MatLab 

IslandT: Lists in python – Python list methods

In this chapter, we will create simple python programs that will demonstrate the usage of various python list methods. # create a simple python program which will manipulate the content of a python list data type student_group = [] student_group.append("Rock") # add a student to the group student_group2 = ["Rick", "Robert", "Robetto"] student_group.extend(student_group2) # add the list of the second group to the first print(student_group) student_group.insert(1, "Ray") # insert Rick at index 1 in the list print(student_group) student_group.remove("Robetto") # remove Robetto from the student list print(student_group) student_group.sort() # sort the…

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How to configure an unordered list as a flex container?

Hi all. My site has a main navigation menu in the form of an unordered list (screenshot; page here). But I can't seem to convert the unordered list element to a flex container. When I set the <ul> element to display: flex, nothing changes in terms of the display/behavior of the <li> elements inside, regardless of what values I set for justify-content. Any ideas why? The overall goal is to ensure the last menu item is right aligned, as in these screenshots. I was hoping to do that with some…

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Programming 

Python List index() – A Simple Illustrated Guide

This tutorial shows you everything you need to know to help you master the essential index() method of the most fundamental container data type in the Python programming language. Definition and Usage: The list.index(value) method returns the index of the value argument in the list. You can use optional start and stop arguments to limit the index range where to search for the value in the list. If the value is not in the list, the method throws a ValueError. Here’s a short example: >>> lst = [“Alice”, 42, “Bob”,…

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MatLab 

Python List sort() – The Ultimate Guide

Every computer scientist loves sorting things. In this article, I’ll show you how Python does it—and how you can tap into the powerful sorting features of Python lists. Definition and Usage: The list.sort() method sorts the list elements in place in an ascending manner. To customize the default sorting behavior, use the optional key argument by passing a function that returns a comparable value for each element in the list. With the optional Boolean reverse argument, you can switch from ascending (reverse=False) to descending order (reverse=True). Here’s a short overview…

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MatLab 

Python: How to Count Elements in a List Matching a Condition?

I stumbled across this question when browsing through StackOverflow and it got me thinking: what’s the best way to count the number of elements in a list that match a certain condition? Can you generalize this way to both general conditions (e.g. x>3) and regular expressions (e.g. ‘a.*’)? Short answer: you can count the number of elements x that match a certain condition(x) by using the one-liner expression sum(condition(x) for x in lst). This creates a generator expression that returns True for each element that satisfies the condition and False…

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Programming 

Python List reverse()

This tutorial shows you everything you need to know to help you master the essential reverse() method of the most fundamental container data type in the Python programming language. Definition and Usage: The list.reverse() reverses the order of the elements in the list. If you want to create a new list with reversed elements, use slicing with negative step size list[::-1]. Here’s a short example: >>> lst = [1, 2, 3, 4] >>> lst.reverse() >>> lst [4, 3, 2, 1] In the first line of the example, you create the…

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Programming 

Python List pop()

This tutorial shows you everything you need to know to help you master the essential pop() method of the most fundamental container data type in the Python programming language. Definition and Usage: The list.pop() method removes and returns the last element from an existing list. The list.pop(index) method with the optional argument index removes and returns the element at the position index. Here’s a short example: >>> lst = [1, 2, 3] >>> lst.pop() 3 >>> lst [1, 2] In the first line of the example, you create the list…

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Python List remove()

How can you insert an element at a given index in a given list? Python’s remove() method is your friend. This tutorial shows you everything you need to know to help you master an essential method of the most fundamental container data type in the Python programming language. Definition and Usage: The list.remove(element) method removes the first occurrence of the element from an existing list. It does not, however, remove all occurrences of the element in the list! Here’s a short example: >>> lst = [1, 2, 99, 4, 99]…

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