UnicodeEncodeError：’ascii’编解码器无法编码字符

我在这个词的末尾追溯到一个商标上标：Protection™ – 我不需要捕获非ascii的东西,但这是一个麻烦,我希望将来会更多地遇到它.

是否有处理非ascii字符的模块？或者,在python中处理/转义非ascii内容的最佳方法是什么？

谢谢！
完整错误：

E
======================================================================
ERROR: test_untitled (__main__.Untitled)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Python26\Test2.py",line 26,in test_untitled
    ofile.write(Test + '\n')
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2122' in position 1005: ordinal not in range(128)

完整脚本：

from selenium import selenium
import unittest,time,re,csv,logging
 
class Untitled(unittest.TestCase):
    def setUp(self):
        self.verificationErrors = []
        self.selenium = selenium("localhost",4444,"*firefox","http://www.BaseDomain.com/")
        self.selenium.start()
        self.selenium.set_timeout("90000")
 
    def test_untitled(self):
        sel = self.selenium
        spamReader = csv.reader(open('SubDomainList.csv','rb'))
        for row in spamReader:
            sel.open(row[0])
            time.sleep(10)
            Test = sel.get_text("//html/body/div/table/tbody/tr/td/form/div/table/tbody/tr[7]/td")
            Test = Test.replace(",","")
            Test = Test.replace("\n","")
            ofile = open('TestOut.csv','ab')
            ofile.write(Test + '\n')
            ofile.close()
 
    def tearDown(self):
        self.selenium.stop()
        self.assertEqual([],self.verificationErrors)
 
if __name__ == "__main__":
    unittest.main()