Strings, Printing and ‘\n’ The printing of a basic string is probably the first program the majority of people, myself included, write in Python – does print(‘hello world’) sound familiar? From the outset we know the principle is simple, we can pass our string through the print() function and the output will be displayed in … Read more
There comes a time in all our coding lives when we need to compare lists to understand whether items in one list appear in a second list. In this article we’ll start where we all started, using for-loops, before moving to a more classic Python list comprehension. We’ll then move beyond that to use Python … Read more
Problem Formulation Every Python object is of a certain type, also called “class”. The class is a blueprint that shows the data and capabilities of each object/instance that is created after this blueprint. Given a Python object (=instance). How to determine/check/get its type (=class)? There are many variants of this question: How to determine the … Read more
Problem Formulation: Given a list of elements in Python. How to get the number of elements in the list? Examples: List Number of Elements [3, 42, 2] 3 [] 0 [‘Alice’, ‘Bob’, ‘Carl’] 3 [(1, 2), [3, 4]] 2 Method 1: len() The most Pythonic way to get the number of list elements is Python’s … Read more
To convert a string object to integer object use the float(string_input) method which typecasts the string input to a floating-point value.
?Introduction You might have a code in Python such that certain functions have no arguments, whereas the others have numerous arguments. While there are times, we have functions with arguments unknown. Thus, we may have n number of arguments in a function, and sometimes we don’t even have a clue about the input size of … Read more
Summary: To check whether a key exists in a dictionary, you can use: The in keyword The keys() method The get() method The has_key() method Overview Mastering dictionaries is one of the things that differentiates the expert coders from the intermediate coders. Why? Because dictionaries in Python have many excellent properties in terms of runtime—and … Read more
Problem Formulation Given a string in hexadecimal form: How to convert the hex string to an integer in Python? For example, you want to convert the hexadecimal string ‘0xff’ to the decimal integer 255. Here are a few other examples: 0x0 –> 0 0x4 –> 4 0x8 –> 8 0x12 –> 18 0x16 –> 22 … Read more
This article will walk you through the different numerical systems that can be used to represent numbers in Python. The system that we usually use in our daily life is the decimal system and, as the name suggests, it is based on 10 basic digits from which we can obtain all the numbers. Out of … Read more
[toc] Summary: The following methods allow us to check if all elements in a list are identical or not: Using list.count() Compare The Elements Using a For Loop Using The all() Method Using The set() Method Using Another List Slice And Compare Problem: Given a list; how will you identify if all elements within the … Read more
Python comes with many built-in functions you can use without importing a library. There are 64 of them. In this article, you’ll get an overview of the most important ones. For a full list of Python built-in functions, check out this resource. For a complete video tutorial course on Python’s built-in functions, check out this … Read more
The next(iterator) function is one of Python’s built-in functions—so, you can use it without importing any library. It returns the next value from the iterator you pass as a required first argument. An optional second argument default returns the passed default value in case the iterator doesn’t provide a next value. Syntax: next(iterator, <default>) Arguments: … Read more