Your problem is that you use .py file as a command. You need to add python to tell which program can execute this code.

Alternatively, you can use black executable if it is installed in your python environment.

Add it in Arguments.

"$FilePath$" --line-length 160

You can do it with update xml file of tools in pycharm, and add tool you want.

Here is function in python

import xml.etree.ElementTree as ET

def add_external_tool(tool_name, command):

    your_version = "2023.1.2" # Put your pycharm version here

    # Path to the tools.xml file
    tools_file = fr"~/.PyCharm{your_version}/config/tools/tools.xml"
    
    # Load the XML file
    tree = ET.parse(tools_file)
    root = tree.getroot()
    
    # Create a new <tool> element
    tool = ET.SubElement(root, 'tool')
    tool.set('name', tool_name)
    tool.set('description', 'My custom tool') # Your description for tool
    
    # Create the <exec> element with the command
    exec_element = ET.SubElement(tool, 'exec') # Change it as you want
    exec_element.text = command
    
    # Save the modified XML back to the file
    tree.write(tools_file)

# Usage
add_external_tool('black', 'which black')

you can modify code as you want was reading to get more information on how to setup black formatter