Python unexpected EOF while parsing (python2.7)

Question

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=nums
    op1, op2, op3=ops
    expr=fmt % (a, op1, b, op2, c, op3, d)
    try:
        res=eval(expr)
    except ZeroDivisionError:
        return
    if 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 run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "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 ok
    res=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 missed a closing parenthesis. Please use an editor or IDE that will warn you about this sort of thing. — TigerhawkT3, Oct 23 '15 at 05:54

score 2 · Answer 1 · answered Oct 23 '15 at 05:51

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.

Python unexpected EOF while parsing (python2.7)

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