python写文件时出有关问题

python写文件时出问题
异常代码如下：
write a file error: [Errno 2] No such file or directory: 'C:\x0cile.txt'

Traceback (most recent call last):
  File "C:\Documents and Settings\USER\桌面\复件 test.py", line 84, in <module>
  test()
  File "C:\Documents and Settings\USER\桌面\复件 test.py", line 78, in test
  writefile(s)
  File "C:\Documents and Settings\USER\桌面\复件 test.py", line 59, in writefile
  f.write(str(string))
UnboundLocalError: local variable 'f' referenced before assignment

Python code

。。。。。。。。。。。                def writefile(string):    strfile="C:\file.txt"    try:        f = open(strfile,'a')    except IOError,e:        print "write a file error:",e    f.write(str(string))    f.close()def test():    fname = 'C:\ZLLKDoc.cpp'    #raw_input('Enter filename: ')    try:        fobj = open(fname, 'r')    except IOError, e:        print "*** file open error:", e    strFile=fobj.read()    fobj.close()        s = eraser(strFile)    print s

实在不知道哪里错了，请大侠们帮忙看看，感激不尽

[解决办法]
转义成'C:\x0cile.txt' 不能当文件名
strfile="C:\file.txt" 改r"C:\file.txt"或"C:\\file.txt"或"C:/file.txt"

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