如何在Python中创建包含各种类型元素的列表？

Question

I have the following parameters in a Python file that is used to send commands pertaining to boundary conditions to Abaqus:

u1=0.0,
u2=0.0,
u3=0.0,
ur1=UNSET,
ur2=0.0,
ur3=UNSET

I would like to place these values inside a list and print that list to a .txt file. I figured I should convert all contents to strings:

List = [str(u1), str(u2), str(u3), str(ur1), str(ur2), str(ur3)]

This works only as long as the list does not contain "UNSET", which is a command used by Abaqus and is neither an int or str. Any ideas how to deal with that? Many thanks!

Answer 1

UNSET is an Abaqus/cae defined symbolic constant. It has a member name that returns the string representation, so you might do something like this:

 def tostring(v):
  try:
   return(v.name)
  except:
   return(str(v))

then do for example

  bc= [0.,1,UNSET]
  print "u1=%s u2=%s u3=%s\n"%tuple([tostring(b) for b in bc])

u1=0. u2=1 u3=UNSET

EDIT simpler than that. After doing things the hard way I realize the symbolic constant is handled properly by the string conversion so you can just do this:

  print "u1=%s u2=%s u3=%s\n"%tuple(['%s'%b for b in bc])