Problem: Given the contents of a text file. How to search and replace a specific string or line in the file? Example: Let’s consider the following example where you want to replace the highlighted (bolded) text parts. Text in the file before replacing a line: There was an idea to bring together a group of … Read more
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This tutorial teaches you two advanced Python skills: closures and decorators. Mastering them will make you a better coder today—so, let’s dive right into them! Closures Every function in Python is first class, because they can be passed around like any other object. Usually, when a programming language creates a function just like other data … Read more
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Problem: Given multiple Python statements. How to write them as a Python One-Liner? Example: Consider the following example of four statements in a block with uniform indentation: Each of the four statements is written in a separate line in a code editor—this is the normal procedure. However, what if you want to one-linerize those: How … Read more
This article discusses a situation where you are required to implement an integer object which, when compared using the greater than operator >, to any other existing integer value in the program, will always return True. Before diving into the possible solutions, we must take note of the following: Python 2 consists of plain integers … Read more
When I googled “Fibonacci Python” today, I found a lot of algorithms (most of them easy to understand). But I wondered — is there a Python one-liner to find Fibonacci numbers in the most concise way? As it turns out, there is! Read on to learn how to write the Fibonacci algorithm in one line … Read more
Summary: To write a nested for loop in a single line of Python code, use the one-liner code [print(x, y) for x in iter1 for y in iter2] that iterates over all values x in the first iterable and all values y in the second iterable. Problem: How to write a nested for loop as … Read more
Problem: You use Python in a terminal and you want to replace a string ‘example’ in a text file file.txt: Your goal is to accomplish the following text: In particular, you want to open the file, replace the text, and rewrite the result into the file—all in a single line of Python code! Can a … Read more
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Summary: To match a pattern in a given text using only a single line of Python code, use the one-liner import re; print(re.findall(pattern, text)) that imports the regular expression library re and prints the result of the findall() function to the shell. Problem: Given a string and a regular expression pattern. Match the string for … Read more
Two ways of writing a recursive one-liner: (1) write the function with return statement in a single line such as in def f(x): return f(x+1), or (2) assign a lambda function to a variable name and use the variable name in the return expression of the lambda function such as in f = lambda x: … Read more