human
assert command not found.
assistant
Here is a Python code to assert command not found

import sys

def assert_command_not_found(command):
    """Raises AssertionError if the command is not found."""
    assert command, "Command not found"

# Enter the command
command = "ls"

# Calling the function
print((assert_command_not_found(command)))

#Example Output
# None

#Remember to inspect code for bugs.