Problem Formulation: Say, you set an environment variable and you want to access it in your Python script. How to get the value of the environment variable? Background: Environment variables are external to the Python environment. They describe the operating system environment we are using. The applications installed use this information to complete specific tasks … Read more
In this tutorial, you’ll learn how to open a PDF file in an external PDF reader or the browser, using a simple Python command. There are many variants to this problem, so let’s dive right into the different ones—and their solutions! Method 1: Open PDF Standard Viewer with os.system(path) — With CMD You can open … Read more
You can modify a text file in Python using one of the following methods:
1. Using The seek() Method.
2. Using The fileinput Module.
3. Using The splitlines() Method.
4. Using the regex module and the
split() and insert() methods.
Why Stop a Python Script? As a programming language,Python is designed to read code line by line and stop at the end of the script by default – so why would we need to stop it? Whilst there are a number of reasons this may be necessary, they basically fall into two distinct categories: You … Read more
Problem Formulation: Given a path to a folder as a Python string. The folder is non-empty. How to remove the whole folder in your Python script? Example: Say, you have the path=’path/to/folder’ in your Python script and it contains some files and subfolders: path –to —-folder ——file1.dat ——file2.dat ——subfolder1 ——–file3.dat ——subfolder2 ——–file4.dat You want to … Read more
If you’re working with the command line in Windows or the terminal in Linux and macOS, you know about the feature of the command-line history. You can access all previously issued commands with the arrow up or arrow down keys. As a Python coder, you want to be able to control everything from your Python … Read more
Challenge: Given a Python program that writes data into a file. If you run the program again, it’ll overwrite the file written by the first execution of the program. Each time you run this program, the original content in file.dat will be overwritten. How to avoid this overwriting by adding an integer suffix to the … Read more
Challenge: Given a string ‘/path/to/file.py’. How to check whether a file exists at ‘/path/to/file.py’, without using the try and except statements for exception handling? # What You Want! if exists(‘/path/to/file.py’): … # Do something Solution: To check whether a file exists at a given path, Run from pathlib import Path to import the path object, … Read more
Problem: You have a Python code file script.py and you want to run it in your Python shell with arguments. Example: You seek a function execute(“script.py”, arg1, arg2, …). The arguments arg1, arg2, … should be used within script.py. How to execute the Python file within your Python code by passing the arguments to the … Read more