Cmd python test python

ikautak / cmd_test.py

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#!/usr/bin/env python

import cmd

import dircache

class MyCmd ( cmd . Cmd ):

def __init__ ( self ):

cmd . Cmd . __init__ ( self )

self . prompt = ‘(MyCmd)’

def do_test ( self , line ):

print ( ‘cmd test ‘ + line )

def complete_test ( self , text , line , begidx , endidx ):

«»» auto complete of file name.

«»»

line = line . split ()

if len ( line ) < 2 :

filename = »

path = ‘./’

else :

path = line [ 1 ]

if ‘/’ in path :

i = path . rfind ( ‘/’ )

filename = path [ i + 1 :]

path = path [: i ]

else :

filename = path

path = ‘./’

ls = dircache . listdir ( path )

ls = ls [:] # for overwrite in annotate.

dircache . annotate ( path , ls )

if filename == » :

return ls

else :

return [ f for f in ls if f . startswith ( filename )]

if __name__ == ‘__main__’ :

mycmd = MyCmd ()

mycmd . cmdloop ()

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tiborsimon/python-cmd-test

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README.md

Simple command line tool demonstration for python.

The package will be installed to the global python install location. Elevated write access may be required.

[sudo] python setup.py install 

Global development installation

It installs the package in development mode. Sources willbe symlinked, so changes in them will take effect immediately. Elevated write access may be required.

[sudo] python setup.py develop 

Local development installation

To install the package to the current user only in development mode, make sure you have ~/.local/bin directory in your PATH .

python setup.py develop --user 

If you tried to install the package both locally and globally, there might be a chance that your shell cached the command location, and the newly installed package fails to run, as the command points to the old location. You can clear the cached paths with the following command:

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How To Run Python Scripts From the Command Line (Terminal)

This article will demonstrate how to get a simple Python script running on the command line in a matter of minutes. Once you’ve mastered that, you can get more complicated by passing in required arguments so that your scripts can stand on their own. Once you are comfortable running Python scripts from the command line, continue improving your skills by learning how to pass arguments to your scripts.

Make Sure Your Terminal or Command Prompt Can Run Python

To start, you need to make sure the command line application you are using has access to your Python installation. To do this, open the command prompt, type python and press ‘Enter’. You should see a message that documents the Python version that is being used followed by >>> , which indicates the next code you type will be executed by the Python interpreter. It will look something like this.

Python 3.8.8 (default, Apr 13 2021, 15:08:03) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32 Type "help", "copyright", "credits" or "license" for more information. >>>

If you don’t see something similar, it means that you don’t have Python installed or that the command prompt is not aware of your Python installation.

Create a Python Script

Let’s create a very simple script to demonstrate how this works. This Python script (hello.py) will simply print out a statement that lets us know the code in the script has run, as shown below.

print("Hello from my Python script")

Run the Python Script from the Terminal

Once your Python script is created it’s super easy to run it from the terminal or command line. All you need to do is type python followed by the script name. You’ll need to make sure that your terminal’s working directory is the directory that contains your python script, or give the full path to the script. For example. If I just type python hello.py I get the following error.

python: can't open file 'hello.py': [Errno 2] No such file or directory

There are two ways to fix this.

First, specify the full file path. Like this.

C:\Users\Konrad>python c:/konrad/code/python/z_testing/hello.py Hello from my Python script

You can see that by specifying the full path to the python script that the terminal now knows where to find the file to run and I get the proper output.

Second, use cd to change the terminal’s current directory. Then run the script. Like this.

(base) C:\Users\Konrad>cd c:/konrad/code/python/z_testing (base) c:\konrad\code\python\z_testing>python hello.py Hello from my Python script

By using cd to change the terminal’s directory I no longer need to type the full path to the python script. This is especially useful if you have a number of different scripts in the same directory that you will want to run.

There’s More!

This article gives you a brief, simple introduction to running python scripts from the terminal (or command line). This is a powerful skill to have and there is so much more you can do with it. With a more advanced script, you can pass in parameters/arguments from the command line, which makes it easy to generalize and share your scripts for others to use in various situations. You can check out my guide for passing variables to python scripts from the terminal in this article.

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Konrad has a Master’s Degree in Ecology and a Doctorate Degree in Water Resources and has been performing geospatial analysis and writing code (in multiple programming languages) for over a decade. He writes code to develop models and analysis workflows to predict and evaluate changes to landscapes and water resources. He has published multiple articles in prominent peer-reviewed, scientific journals. Konrad’s code and workflow contribute to operational products that inform water and ecosystem management.

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