The Best way to build a Python command line tool - Python Typer Tutorial

In this video, I go over what I think is one of the best modules for creating Python Command Line (CLI) Tools.

I go over What Python Typer is, how to install and import it and how to use variables and command-line switches.

Make Professional look Python CLI Applications today.

If you want to know how to package a python application:

📘 Chapters:
0:00 What is Python Typer
0:26 Typer Code Example, building commands using functions
3:36 Adding variables to our Typer CLI application
5:42 Adding in CLI Switches
7:22 Adding in autocompletion to our Python CLI App

[DevOpsJourney]

What's your favorite Python module for creating CLI applications?

[dramastar]

Cool 😎. Typer is simply smart. Thanks for the demo🙏🏻

[FrancoisSchnell]

Neat! Didn't know about typer, thanks!

[winnumber]

"and it's just gonna show me my IQ of 500... so this is a pretty good feel-good app right now, feeling pretty smart" lmao

[abhityagi]

I am trying to use nubian, it is full fledged CLI creator with a feel of Cisco IOS or other network vendor devices, it was developed for LDShell by Facebook developers, but I can gurantee it is a hard nut to crack trying to include my commands and no luck so far after 5 hours..

[VOGTLANDOUTDOORS]

ENJOYED the video - nicely done !
INTERESTING little package, but some comments/challenges already encountered:
1. the documentation uses the term "main" FAR TOO MUCH and in TOO MANY PLACES to see when you NEED to use "main" and when it's OPTIONAL (sloppy documentation);
THAT IS:
- you DON'T need to name your file "main.py" <--- this is always & ever a BAD IDEA in example documentation, because it (wrongly) assumes a connection with "__main__" !!!
- you CAN use a file named "mtcbrain.py", with a function "hello()" and then call it as follows: > python mtcbrain.py hello
2. the FIRST thing I noticed was that the command names MUST be in ALL LOWERCASE; NO CamelCase, NO underscored_Names :-( !!!
THAT IS, the following function names either WORK or DON'T
- hello() WORKS (we KNEW this) :-)
- Hello() DOESN'T WORK (that came as a surprise, but it's also BAD NAMING CONVENTION for python FUNCTIONS, so nobody noticed anyways) :-O
- helloThere() DOESN'T WORK (this came as a REAL SURPRISE, because this is likely the MOST COMMON NAMING CONVENTION in all of python) :-O
- hello_there() also DOESN'T WORK (this came as ANOTHER SURPRISE) because this is the 2ND-MOST-COMMON NAMING CONVENTION in all of python) :-O
- hellothere() WORKS and will have to do for anyone trying to use multi-word (sorry "multiword") function names ;-)
3. even your ARGUMENT NAMES must also be ALL LOWER CASE !!!
THAT IS:
- hellothere(userName: str) DOESN'T WORK
- hellothere(username: str) DOES WORK

I'll CONTINUE test-driving this package as it's the FIRST one I tried, so I've NOTHING to compare to which to compare it, and will report back.

HOPE THIS HELPS OTHERS TRYING TO BUILD CLI-TYPE APPS IN PYTHON - it's a GOOD THING TO DO, and containerizing PYSIMPLEGUI type apps ISN'T CROSS-PLATFORM (yet) !

Cheers,
-Mark Vogt, Principal Data Scientist, AVANADE (www.avanade.com)

[dragon]

hello, what if we are working with pipenv, how to make it working with the command typer to get the autocomplete ? and also can we combine fzf instead of the autocomplete? thanks

[JH-vzyj]

All nice and good but this, like all of the other tutorials it is for the command line arguments when you LAUNCH the python script

(i.e., python nameOffScript --arg1 val etc...).

My use case is that I have a command line within the launched program and I want it to parse my dozens of commands every time I receive command input. How do I bend it to that? I naively tried putting the app() call after the input command but it is just confused

[islandcave]

This is better than optparse and argparse.

[charleswilson]

I'm having a little trouble getting the auto completion to work in ubuntu. I'm probably missing something basic.
type typeset
Command 'typer' not found, but can be installed with:
sudo snap install erlang
If you can take a look at it I would appreciate it.
Also this is the simplest cli I have tried very intuitive.
edit: didn't realize I had to pip install typer-cli

[suwenhao]

hi, sir . How could I install "typer" in powershell?

[jpeg.x]

how do u start the program from the command line? ive tried "python .\Program.py" (without quotations) but it hasnt worked

[thiagoalves]

Is it possible to make the CLI commands interactive?

[muhammadnoorani]

I made a cli similar project, I want to deploy it and make it accessible to users. How can I do it??

[Wallee]

4:10 You can just add the name variable as another argument to print, no need for an F string :D

[ItzShinePlayz]

How do I code a invalid cli when user type the wrong command that is not in the list using type?

[jabuci]

How does it differ from the click module?

[writethatdown]

What do I do if it says: "zsh: permission denied: ./main.py"?

[yogimanuk]

So I am not trying to be a smart ass here, this is simply an observation that has puzzled me for years. You need 7 lines of code to output 1 line to the console using python, in BASIC for example you need 1 [ 10 Print "Hello" ] using BASH you need 1 echo "Hello" so I have to ask why does python seem so inefficient and long winded. Oh and this doesn't seem to be just Python other languages have similar issues. It seems like a very poor way to program computers to me. Perhaps this explains why software is so over bloated these days.