human
Solve the following python programming problem given the following code:
@ contextmanager 
def extracted_sdist(src, sdist, expected_prefix, collect_suffixes = None) : 
    collect_suffixes = (_ or ('.py',)) 
    def collect(path) : 
        for suffix in collect_suffixes : 
            if path.endswith (suffix) : 
                return True 
return False 
with temporary_dir () as chroot : 
        TGZ.extract (sdist, chroot) 
        all_py_files = set () 
        for (root, _, files) in os.walk (chroot) : 
            all_py_files.update ((os.path.join (root, f) for f in files if collect (f))) 
def as_full_path(p) : 
            return os.path.join (chroot, expected_prefix, p) 
(yield (all_py_files, as_full_path)) 

    
    

    Fix the buggy line: collect_suffixes = (_ or ('.py',))
assistant
#Here is Python code to fix the buggy line: collect_suffixes = (_ or ('.

collect_suffixes = (collect_suffixes or ('.py',))