The twelfth offline real-time writing reference problem. Implementation by python

How to write offline in real time http://atnd.org/events/40389 Reference problem (turtle along the road) http://nabetani.sakura.ne.jp/hena/ord12aloroturtle/ Implementation example. ruby.

Examples of answers in other languages http://qiita.com/Nabetani/items/1de39df381dfeee305ab You can follow from.

so. I wrote it in python, which I'm not used to. Works with both python 3.3 and python 2.7.

Like this.

#coding:utf-8
import re

MAP =  [
    range(i*11, i*11+11) for i in range(0,3)
  ] + [
    range(33+i*3, 33+i*3+3) for i in range(0,9)
  ]

def chars( start, len ) : 
  return [ chr(c) for c in range(ord(start),ord(start)+len) ]

NAMES=chars( "A", 26 ) + chars( "a", 26 ) + chars( "0", 10  )

def turn( d, r ):
  return [r*d[1],-r*d[0]]

def name( t ):
  return NAMES[ MAP[ t[0][1] & 0xff][ t[0][0]  & 0xff] & 0xff]

def move(t):
  n=name(t)
  for warp in [[2,11,"efg"], [10,2,"567"]]:
    if n in warp[2] and t[1][1]==1 :
      t[0]=[warp[0]-warp[2].index(n),warp[1]]
      t[1]=[0,-1]
      break
  else:
    t[0][0]+=t[1][0]
    t[0][1]+=t[1][1]

def solve( src ):
  t=[[0,0],[1,0]]
  r="A"
  try:
    for c in src :
      if c=="L" or c=="R":
        t[1]=turn(t[1], 1 if c=="L" else -1)
      else:
        for i in range(int(c,16)):
          move(t)
          r+=name(t)
  except IndexError:
    r+="?"
  return r

def test( samples ) :
  for line in samples.splitlines():
    a=re.split( "\s+", line ) # num, input, expected
    if 2<len(a):
      actual = solve( a[1] )
      ok=actual==a[2]
      print( [ "ok" if ok else "***NG***", a[1:3], actual ] )

test( """
0   2RcL3LL22   ABCNYjmpsvy147edcbcdef
1   L3R4L5RR5R3L5   A?
40  6LR2R1LR5LRLRL484L63    ABCDEFGHITe741yxw?""" )

As usual, most of the test data is omitted.

The implementation policy is to read the map so that it has a Cartesian coordinate system and warp it where it is needed.

45 lines excluding tests. It's not like it's long.

The name method & 0xff is for converting a negative index to an invalid index. Feeling evil.

This time, for the first time, I tried using the else and exception of the for statement. I think the exception is the usage that is not good.

However, no matter how many times I write it, the if expression is unpleasant.