scripts/remove_spice_instances.py

import sys

argv = sys.argv

assert len(argv) > 2, "usage: ./script.py filename cell1 cell2 ..."

filename = argv[1]
cells = argv[2:]

with open(filename) as f:
    content = f.readlines()

prev_remove = False
remove = False
new_content = []
for line in content:
    if line.startswith('X'):
        for cell in cells:
            if cell in line:
                remove = True
    elif line.startswith('+') and prev_remove:
        remove = True

    if not remove:
        new_content.append(line)
    else:
        print("Removing:", line)

    prev_remove = remove
    remove = False

with open(filename, 'w') as f:
    f.writelines(new_content)