Learn to Code. Shape Your Future
The next() function is useful when working with iterators and it’s a must-know for Python developers. The Python next() function takes as the first argument an iterator and as an optional argument a default value. Every time next() is called it returns the next item in the iterator until no items are left. At that point the next … Read more
Knowing how to write a unit test in Python is critical for developers. Just writing your application code is not enough, writing tests is a must. Unit tests allow you to test self-contained units of your code independently from each other. Python provides the unittest framework that helps write unit tests following a pre-defined format. … Read more
In this tutorial we will create a stack in Python step-by-step. The stack is a LIFO (Last-in First-out) data structure. To create a stack in Python you can use a class with a single attribute of type list. The elements of the stack are stored in the list using the push method and are retrieved … Read more
A simple approach to check if a Python string contains a number is to verify every character in the string using the string isdigit() method. Once that’s done we get a list of booleans and if any of its elements is True that means the string contains at least one number. There are multiple ways … Read more
Knowing how to write the elements of a list to a file in Python can be handy. This tutorial will show you how to do that in multiple ways. A common approach to writing list elements to a file using Python is to first iterate through the elements of the list using a for loop. … Read more
The Python json module allows to use data in JSON format in your applications. Do you want to convert a Python object into JSON or viceversa? This is the right module to do that. The Python json module provides functions to convert a Python object into JSON (dump() and dumps()), this conversion is called serialization … Read more
The Python yield keyword is something that at some point you will encounter as developer. What is yield? How can you use it in your programs? The yield keyword is used to return a value to the caller of a Python function without losing the state of the function. When the function is called again … Read more
If you want to serialize and deserialize Python objects you might have considered using the Python Pickle module. The Python Pickle module allows to serialize and deserialize a Python object structure. Pickle provides two functions to write/read to/from file objects (dump() and load()). It also provides two functions to write/read to/from bytes objects. We will … Read more
Have you ever seen the message “TypeError: unhashable type” when running your Python program? Do you know what to do to fix it? The message “TypeError: unhashable type” appears in a Python program when you try to use a data type that is not hashable in a place in your code that requires hashable data. … Read more
Are you writing a Python application and do you need to check for duplicates in a list? You are in the right place, let’s find out how to work with duplicates. There are several approaches to check for duplicates in a Python list. Converting a list to a set allows to find out if the … Read more
