Problem Formulation Given a filename and an integer n. How to read the first n lines of the file in your Python script? Here’s an overview of the solutions: Method 1: Store Head in a List of Strings To read the first n lines of a given file and store each line in a list … Read more
To convert a string to a lowercase string in Python, use the string.lower() built-in string method. This returns a lowercase string version. As you read over the explanations below, feel free to watch our video guide about this particular string method: If you want to perform case insensitive matching in languages such as German or … Read more
Problem Formulation: Given a string my_string. Find the number of characters of the string! For example, the string “what is my length?” must yield integer 18 because it has 18 characters. Here are three examples of our desired outputs: Solution: Before we dive into alternatives, here’s the quick answer to this question. To get the … Read more
To print a percentage value in Python, use the str.format() method or an f-string on the format language pattern “{:.0%}”. For example, the f-string f”{your_number:.0%}” will convert variable your_number to a percentage string with 0 digits precision. Simply run those three basic statements in your shell: your_number = 0.42 percentage = “{:.0%}”.format(your_number) print(percentage) As a … Read more
When mentally approaching this problem, you may be tempted to utilize a “for loop”. I admit that’s how my mind was working: iterate through the list one element at a time and check for empty strings. If it’s empty, remove it. Repeat. Please join me in today’s topic on how to remove empty strings from … Read more
Problem Formulation Given a string s. How to find the substring s’ between an opening and a closing parentheses? Consider the following examples: Input: ‘Learn Python (not C++)’ Output: ‘not C++’ Input: ‘function(a, b, c, d)’ Output: ‘a, b, c, d’ Input: ‘(a+(b+c))’ Output: ‘a+(b+c)’ Method 1: Slicing and str.find() The simplest way to extract … Read more
Summary: This blog explains the ways to apply a given function to each element of a list. The best way to apply a function to each element of a list is to use the Python built-in map() function that takes a function and one or more iterables as arguments. It then applies the function to … Read more
[toc] Quick Fix: Python’s built-in str(x) method converts an integer object x to a string object by using the x.__str__() method. ❖ Introduction Problem Formulation: Given a string object in Python, what are the ways to convert it to an Integer type? Example: Output: Let us have a look at an example where converting an … Read more
? Summary: This blog explores the steps to remove all non-alphabet characters from a given string. The ‘re’ module in Python provides regular expression operations, to process text. One uses these operations to manipulate text in strings. The compile() method in conjunction with the sub() method can remove all non-alphabet characters from a given string. Note: … Read more
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
In this article, I present 7 Python scripts that can be used to determine if a string contains nothing but digits 0 – 9. All 7 scripts work for uncomplicated strings – those that don’t have unusual or non-English characters, and do not contain spaces. To understand the idiosyncrasies of each script, see the caution … 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.