编程规范

Python

• Use ‘’.startswith() and ‘’.endswith() instead of string slicing to check for prefixes or suffixes.

  startswith() and endswith() are cleaner and less error prone:

  Yes: if foo.startswith(‘bar’):

  No: if foo[:3] == ‘bar’:

• When catching exceptions, mention specific exceptions whenever possible instead of using a bare except: clause:

  try:
      import platform_specific_module
  except ImportError:
      platform_specific_module = None

  *和**的用法

  *args 表示接收一个tuple作为参数；\**kw 表示接收一个dict作为参数

  def sample(a,*args,**kwargs):
    print “a is {}”.format(a)
    print “*args is a tuple {}”.format(args)
    print “**kwargs is a dictionary {}”.format(kwargs)
  >>> sample(1,2,3,4,name=”rahul”,age=26)
  a is 1
  *args is a tuple (2, 3, 4)
  **kwargs is a dictionary {‘age’: 26, ‘name’: ‘rahul’}