Professional CLI Applications with Click 

indeed, i totally agree

Click is internally based on optparse instead of argparse. This is an implementation detail that a user does not have to be concerned with. Click is not based on argparse because it has some behaviors that make handling arbitrary command line interfaces hard

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rsync, cat, grep etc. are all standalone programs, just like the python script is itself one. You'd need to create separate programs for each of those, so having multiple python files.

convert the file to exe and add system path,just entery add_todo -n xxx commands will be working.a simple way on windows.

Yeah!

Click is internally based on optparse instead of argparse. This is an implementation detail that a user does not have to be concerned with. Click is not based on argparse because it has some behaviors that make handling arbitrary command line interfaces hard

tkinter is an old GUI library (Graphical User Interfaces). click helps you make a TUI (Terminal User Interface). A gui needs a graphical environment, the tui just needs a terminal window and is much, much easier to implement.

@@voxelfusion9894Building on what you said, while terminal apps don’t look super pretty, they’re much easier to run on your computer than GUI apps like tkinter. Raw text is easier to render than a whole window. Terminal apps can come in handy when you have a little process or a function you want to quickly run from the command line without opening tons of other apps or making a dedicated file for it. A nice use-case I’ve stumbled across for it is quickly generating complicated text-based diagrams or tables to plug into code comments. Lots of JavaScript frameworks use terminal apps for some basic config stuff like choosing which language to use for another tool or something. They aren’t vitally important all the time, but they’re worth knowing how to use, because you never know when it can come in handy 🛠️

when copy of the code is not provided and it crashes :)