如果要 import 的模块是字符串(比如利用参数进行传递)，可以事业 builtin 的 __import() 函数，例如：
def __init__(self, module='__main__', defaultTest=None,
argv=None, testRunner=None, testLoader=defaultTestLoader):
if type(module) == type(''):
self.module = __import__(module)
for part in module.split('.')[1:]:
self.module = getattr(self.module, part)
else:
self.module = module
又如：
mod = __import__('random')当然也可以使用
exec "import %s as mod" % module
来解决。
可以看看 unittest 对它的使用，得到一个更清楚的认识：
class TestLoader:
...
def loadTestsFromModule(self, module):
"""Return a suite of all tests cases contained in the given module"""
tests = []
for name in dir(module):
obj = getattr(module, name)
if (isinstance(obj, (type, types.ClassType)) and
issubclass(obj, TestCase)):
tests.append(self.loadTestsFromTestCase(obj))
return self.suiteClass(tests)
......
class TestProgram:
def __init__(self, module='__main__', defaultTest=None,
argv=None, testRunner=None, testLoader=defaultTestLoader):
if type(module) == type(''):
self.module = __import__(module)
for part in module.split('.')[1:]:
self.module = getattr(self.module, part)
else:
self.module = module
...
def parseArgs(self, argv):
import getopt
try:
options, args = getopt.getopt(argv[1:], 'hHvq',
['help','verbose','quiet'])
for opt, value in options:
if opt in ('-h','-H','--help'):
self.usageExit()
if opt in ('-q','--quiet'):
self.verbosity = 0
if opt in ('-v','--verbose'):
self.verbosity = 2
if len(args) == 0 and self.defaultTest is None:
self.test = self.testLoader.loadTestsFromModule(self.module)
return
if len(args) > 0:
self.testNames = args
else:
self.testNames = (self.defaultTest,)
self.createTests()
except getopt.error, msg:
self.usageExit(msg)
