[SOLVED] How to call python function with default values when they are using typer decorated functions

How to call python function with default values when they are using typer decorated functions

I'm currently migrating some Python functions to be used with the Typer library for a CLI application. Previously, these functions worked well with default parameters, but I'm encountering issues when applying Typer's argument and option decorators, specifically when dealing with default parameter values. I am using Python 3.10.

Here's an example of my code where the issue occurs:

main.py:

import typer

app = typer.Typer()

log_level_arg = typer.Argument(default="debug", help="The output logging level. This can be one of: debug, info, warning, error, and critical.")

@app.command()
def view(log_level: str = log_level_arg):
    """
    View IP address of switch in environment if it exists
    """
    print("log level:")
    print(log_level)
    print(type(log_level))

@app.command()
def view_old(log_level: str = "debug"):
    print("log level:")
    print(log_level)
    print(type(log_level))

print("view:")
view()

print()

print("view old:")
view_old()

Running python main.py view outputs:

python main.py view
view:
log level:
<typer.models.ArgumentInfo object at 0x7f9804e4ceb0>
<class 'typer.models.ArgumentInfo'>

view old:
log level:
debug
<class 'str'>
log level:
debug
<class 'str'>

This bit here is the troublesome part:

view:
log level:
<typer.models.ArgumentInfo object at 0x7f9804e4ceb0>
<class 'typer.models.ArgumentInfo'>

Instead of the log_level argument being recognized as a string with the default value "debug," it's being treated as a typer.models.ArgumentInfo object. This behavior is unexpected and causes subsequent functionality that depends on log_level being a string (e.g., lower() method calls) to fail.

So my question: I guess I can workaround this with additional functions that just wrap the existing ones, but is there perhaps a way to avoid this and do this natively?

Solution

Nope not natively possible according to https://github.com/tiangolo/typer/issues/279 though there are workarounds mentioned in that thread.