Python define class in function, the class canbe access global

Question

abc.py, how to create b() in class a ?

class a(object):
  bInst=b()

def start():
  class b(obj):
    pass

if __name=='__main__'
  start()

But how to using variable, Here is the codes, it report 'myCls' is not defined.

class a(obj):
   inst=myCls()

def start
    tSuiteN="myCls"
    exec('global tSuiteN')
    str="class {}(object): pass".format(tSuiteN)
    exec(str)

Answer 1

Make it global.

def start():
  global b
  class b(obj):
    pass