python显示括号错误_不平衡括号错误使用搜索python

我有一个列表，我想循环查看(对于trim中的trimptemp)，看看它在给定的字符串(modeltrim)中是否有匹配项。代码在大多数情况下运行良好，但偶尔会出现以下错误：Traceback (most recent call last):

File "/home/hostadl/PricesFinal.py", line 318, in

main()

File "/home/hostadl/PricesFinal.py", line 215, in main

match = re.search(r'{0}'.format(trimtemp), modeltrim, re.IGNORECASE)

File "/usr/local/lib/python3.2/re.py", line 158, in search

return _compile(pattern, flags).search(string)

File "/usr/local/lib/python3.2/re.py", line 256, in _compile

return _compile_typed(type(pattern), pattern, flags)

File "/usr/local/lib/python3.2/functools.py", line 180, in wrapper

result = user_function(*args, **kwds)

File "/usr/local/lib/python3.2/re.py", line 268, in _compile_typed

return sre_compile.compile(pattern, flags)

File "/usr/local/lib/python3.2/sre_compile.py", line 491, in compile

p = sre_parse.parse(p, flags)

File "/usr/local/lib/python3.2/sre_parse.py", line 692, in parse

p = _parse_sub(source, pattern, 0)

File "/usr/local/lib/python3.2/sre_parse.py", line 315, in _parse_sub

itemsappend(_parse(source, state))

File "/usr/local/lib/python3.2/sre_parse.py", line 642, in _parse

raise error("unbalanced parenthesis")

sre_constants.error: unbalanced parenthesis

您的帮助将不胜感激！在