# this file may be used from any of other project files

# so don't import any project files here to avoid recursive imports

def mergedict(dest, src, prefix = None, allow_collisions = False, overwrite = True):

  for k, v in src.items():

    kk = k if prefix is None else prefix + k

    assert allow_collisions or kk not in dest

    if overwrite or kk not in dest:

      dest[kk] = v