FM / ply

/usr/lib/python3.6/site-packages/ply

Name	Size	Mode	Actions
__pycache__/	-	0755	rm
cpp.py	33525	0644	edit dl rm
ctokens.py	3177	0644	edit dl rm
lex.py	42960	0644	edit dl rm
yacc.py	137286	0644	edit dl rm
ygen.py	2251	0644	edit dl rm
__init__.py	102	0644	edit dl rm

Edit: /usr/lib/python3.6/site-packages/ply/ygen.py (2251B)

# ply: ygen.py
#
# This is a support program that auto-generates different versions of the YACC parsing
# function with different features removed for the purposes of performance.
#
# Users should edit the method LParser.parsedebug() in yacc.py.   The source code 
# for that method is then used to create the other methods.   See the comments in
# yacc.py for further details.

import os.path
import shutil

def get_source_range(lines, tag):
    srclines = enumerate(lines)
    start_tag = '#--! %s-start' % tag
    end_tag = '#--! %s-end' % tag

for start_index, line in srclines:
        if line.strip().startswith(start_tag):
            break

for end_index, line in srclines:
        if line.strip().endswith(end_tag):
            break

return (start_index + 1, end_index)

def filter_section(lines, tag):
    filtered_lines = []
    include = True
    tag_text = '#--! %s' % tag
    for line in lines:
        if line.strip().startswith(tag_text):
            include = not include
        elif include:
            filtered_lines.append(line)
    return filtered_lines

def main():
    dirname = os.path.dirname(__file__)
    shutil.copy2(os.path.join(dirname, 'yacc.py'), os.path.join(dirname, 'yacc.py.bak'))
    with open(os.path.join(dirname, 'yacc.py'), 'r') as f:
        lines = f.readlines()

parse_start, parse_end = get_source_range(lines, 'parsedebug')
    parseopt_start, parseopt_end = get_source_range(lines, 'parseopt')
    parseopt_notrack_start, parseopt_notrack_end = get_source_range(lines, 'parseopt-notrack')

# Get the original source
    orig_lines = lines[parse_start:parse_end]

# Filter the DEBUG sections out
    parseopt_lines = filter_section(orig_lines, 'DEBUG')

# Filter the TRACKING sections out
    parseopt_notrack_lines = filter_section(parseopt_lines, 'TRACKING')

# Replace the parser source sections with updated versions
    lines[parseopt_notrack_start:parseopt_notrack_end] = parseopt_notrack_lines
    lines[parseopt_start:parseopt_end] = parseopt_lines

lines = [line.rstrip()+'\n' for line in lines]
    with open(os.path.join(dirname, 'yacc.py'), 'w') as f:
        f.writelines(lines)

print('Updated yacc.py')

if __name__ == '__main__':
    main()

cmd: