Problem encountered: to_neato_string()

[stevewu2001]

The following code would produce a KeyError:

"""
import forgi.graph.bulge_graph as fgb
import sys
import os

class RedirectStdStreams(object):
def init(self, stdout=None, stderr=None):
self._stdout = stdout or sys.stdout
self._stderr = stderr or sys.stderr
def enter(self):
self.old_stdout, self.old_stderr = sys.stdout, sys.stderr
self.old_stdout.flush(); self.old_stderr.flush()
sys.stdout, sys.stderr = self._stdout, self._stderr
def exit(self, exc_type, exc_value, traceback):
self._stdout.flush(); self._stderr.flush()
sys.stdout = self.old_stdout
sys.stderr = self.old_stderr

def create_bg_from_db(db_str):
devnull = open(os.devnull, 'w')
with RedirectStdStreams(stdout=devnull):
bg = fgb.BulgeGraph.from_dotbracket(db_str)
return bg

db_str = ".................."
bg = create_bg_from_db(db_str)
print(bg.to_neato_string())
"""

If the dot-bracket string does not have any brackets (no stems), there will be a missing key 's0'.