How to take an existing Socorro crash signature and remove the arguments

no_arg_sig.py

from configman.dotdict import DotDict
from socorro.processor.signature_utilities import CSignatureToolBase

c = DotDict()
c.collapse_arguments = True
ct = CSignatureToolBase(c)

signature_with_arguments = "@0xb6f11e3c | some_func() | aont(onth()) | operator()(ortho)"

signature_with_no_arguments = ct._collapse(
    signature_with_arguments,
    open_string='(',
    replacement_open_string='',
    close_string=')',
    replacement_close_string='',
    exception_substring_list=(
        'operator',
        'anonymous namespace'
    )
)

assert (
    signature_with_no_arguments == "@0xb6f11e3c | some_func | aont | operator()"
)