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
Problem Formulation Given a JSON object stored in a file named “your_file.json” such as a list of dictionaries. 💬 How to append data such as a new dictionary to it? # File “your_file.json” (BEFORE) [{“alice”: 24, “bob”: 27}] # New entry: {“carl”: 33} # File “your_file.json” (AFTER) [{“alice”: 24, “bob”: 27}, {“carl”: 33}] Method 1: … Read more
Are you confronted with a JSON file and at a loss to know how to extract wanted information, or you don’t know about JSON but would like to? Today we’ll introduce the JSON format and use Python to access a JSON file. We’ll extract the data we need and we’ll use the Python JSON module … Read more
Subtitle: Avoid Hard-Coded Data While Making Your (And Others) Life Easier When the subject of config, or configuration, files comes up there is often confusion on what they are, how to read them, and the benefits that come from their use. In this article, we will cover what config files are before introducing the Python … Read more
If you have worked on a Python application where you had data in another folder, you would have used a command-line tool like cd to change directories. In this tutorial, we will learn a more Pythonic way of changing directories. Changing directories using the os.chdir function The easiest way to change the working directory in … Read more
Problem Formulation Given the path to a text file such as /path/to/file.txt. How to read all the content from the file and print it to the Python standard output? Standard File Reading and Printing The standard approach to read the contents from a file and print them to the standard output works in four steps: … Read more
Problem Formulation Given a Windows operating system on which you have the Microsoft Outlook email program installed. How to open Microsoft Outlook using only a function call in your Python script? Solution: os.startfile(‘outlook’) The easiest way to open Outlook on Windows using only a short and concise Python One-Liner is to use the os.startfile(‘outlook’) function … Read more
Problem Formulation: How to Remove a Directory in Python? The rm command in Linux removes a specific directory. You can also add the options -r remove the directory recursively -f ignore nonexistent files and arguments and don’t prompt the user to ask for confirmation So, if you run rm -rf my_directory, it’ll forcefully remove my_directory … Read more
Problem Formulation You create images in the Tag Image File Format (TIFF). You want to add custom metadata to the image such as the location or other context information important for post-processing. How can you accomplish this? Solution Install and import the library tiffile. Use the tiffile.imsave() function to store the file at a given … Read more
Summary: You can run multiple versions of Python on Windows using one of the following methods: Using entire path to execute the code. Creating A Shortcut or Symbolic Link to the executable files. Using Pylauncher: Use Shebang (#) in The Script Run Pylauncher Command Using Virtual Environments. ➠ Problem Formulation: You might have two versions … Read more
Python’s built-in open() function opens a file and returns a file object. The only non-optional argument is a filename as a string of the file to be opened. You can use the file object to access the file content. For example, file_obj.readlines() reads all lines of such a file object. Here’s a minimal example of … Read more
A newline is used to mark the end of a line and the beginning of a new one, and in this article we are going to look at how to read a file in Python without these newline breaks. To begin with we are going to create a simple .txt file. After each line of … Read more