Easy extraction of python import package properties method

dir is the most convenient, but if you want to know a specific attribute that starts with _, you need to write a filter. Here are two ways to implement the filter

# method 1
def e(start='_', module='os'):
 module = __import__(module)
 def gen_attr():
  for attr in dir(module):
   if attr.startswith(start):
    yield attr
 yield from gen_attr()

# method 2  The generator derivation is more concise 
def e2(start='', module='os'):
 module = __import__(module)
 yield from (attr for attr in dir(module) if attr.startswith(start))


if __name__ == '__main__':
 print (list(e('')))
 print (list(e2('a')))