Here's my python code. Could someone show me what's wrong with it? I try to learn an algorithm on solving 24 - point game. But I really don't know why this program has an error.

from __future__ import division
import itertools as it
__author__ = 'linchen'fmtList=["((%d%s%d)%s%d)%s%d", "(%d%s%d)%s(%d%s%d)", 
"(%d%s(%d%s%d))%s%d", "%d%s((%d%s%d)%s%d)", "(%d%s(%d%s(%d%s%d))"]
opList=it.product(["+", "-", "*", "/"], repeat=3)def ok(fmt, nums, ops):a, b, c, d=numsop1, op2, op3=opsexpr=fmt % (a, op1, b, op2, c, op3, d)try:res=eval(expr)except ZeroDivisionError:returnif 23.999< res < 24.001:print expr, "=24"def calc24(numlist):[[ok(fmt, numlist, op) for fmt in fmtList] for op in opList]for i in set(it.permutations([3,3,8,8])):calc24(i)

And Here's what happens:

Traceback (most recent call last):File "D:\Program Files\JetBrains\PyCharm 4.0.5\helpers\pydev\pydevd.py", line 2217, in <module>globals = debugger.run(setup['file'], None, None)File "D:\Program Files\JetBrains\PyCharm 4.0.5\helpers\pydev\pydevd.py", line 1643, in runpydev_imports.execfile(file, globals, locals)  # execute the scriptFile "C:/Users/linchen/PycharmProjects/untitled/calc24.py", line 26, in <module>calc24(i)File "C:/Users/linchen/PycharmProjects/untitled/calc24.py", line 22, in calc24[[ok(fmt, numlist, op) for fmt in fmtList] for op in opList]File "C:/Users/linchen/PycharmProjects/untitled/calc24.py", line 15, in okres=eval(expr)File "<string>", line 1(8+(3+(3+8))^
SyntaxError: unexpected EOF while parsing

Could anyone told me how to fix this problem?

You're last fmtList item has unbalanced parenthesis:

"(%d%s(%d%s(%d%s%d))"

should be:

"(%d%s(%d%s(%d%s%d)))"

And that explains the traceback -- Python is looking for a closing parethesis -- instead it encounters and end of line (when using eval, the end of line is interpreted as "End Of File" or EOF) and so you get the error.