求助：python 的raw_input函数求助

327zhoulei

在使用raw_input（）函数时，如果不封装成类，不用unittest的框架是没问题的，控制台能正常输入，代码获取键盘输入也正常。但是如果封装成类，用unittest框架调用就控制台无法输入，一直阻塞在哪里。求解：
截图如下：
这样就执行不了，一直阻塞在这里
class Strategy(unittest.TestCase):
    def setUp(self):
       self.base_url = first_url
       self.verificationErrors = []
       self.accept_next_alert = True
    def testStrategy(self):
        try:
            floatnum = float(raw_input("Please input a float:"))
            intnum = int(floatnum)
            print 100/intnum
        except ZeroDivisionError:
            print "Error:you must input a float num which is large or equal then 1!"
        except ValueError:
            print "Error:you must input a float num!"执行后一直阻塞在终端输入，但是无法输入：
/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 /Applications/PyCharm.app/Contents/helpers/pycharm/utrunner.py /Users/zhoulei/PycharmProjects/fund_management/Strategy001.py true
Testing started at 下午3:51 ...

如果不做任何封装，调动raw_input就没问题
try:
    floatnum = float(raw_input("Please input a float:"))
    intnum = int(floatnum)
    print 100/intnum
except ZeroDivisionError:
    print "Error:you must input a float num which is large or equal then 1!"
except ValueError:
    print "Error:you must input a float num!"
结果：
/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 /Users/zhoulei/PycharmProjects/fund_management/test.py
Please input a float:test
Error:you must input a float num!

Process finished with exit code 0

327zhoulei

跪求大侠指导