How to Create a Python Package

When you’ve got a large number of Python classes (or “modules”), you’ll want to organize them into packages. When the number of modules (simply stated, a module might be just a file containing some classes) in any project grows significantly, it is wiser to organize them into packages – that is, placing functionally similar modules/classes in the same directory. […]

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How to Install Virtualenv (Python)

Note: Edited comments about the –no-site-packages argument now being default, thanks to @dideler on Twitter. Python is a very powerful scripting language. The language has lots of Python packages you can install and use in your projects. Sometimes, you may have different projects that need different versions of the same package/module. For example, let’s say […]

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Add Python to the PATH Environmental Variable (‘python’ is not recognized as an internal or external command)

Many developers install Python on their Windows machine, and when they try to run the console command python.exe, they get the following error message: ‘python’ is not recognized as an internal or external command . We’ll show you how to install Python, and fix this error. By adding Python to the PATH environmental variable. Step […]

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How to Run a Python Script via a File or the Shell

If you can’t execute or run a Python script, then programming is pointless. When you run a Python script, the interpreter converts a Python program into something that that the computer can understand. Executing a Python program can be done in two ways: calling the Python interpreter with a shebang line, and using the interactive […]

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Check if a String is a Number in Python with str.isdigit() (and Unicode)

Edit 1: This article has been revised to show the differences between str.isdigit() and the custom solution provided. Edit 2: The sample also supports Unicode! Often you will want to check if a string in Python is a number. This happens all the time, for example with user input, fetching data from a database (which […]

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