1 assert的作用
assert condition
当condition不成立的时候，那么程序会raise一个AssertionError出来
所以其实 assert condition相当于：
if not condition: raise AssertionError()
2 实例
assert True
程序通过
assert False
程序抛出异常：
Traceback (most recent call last): File "E:\ProgramData\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py", line 2963, in run_code exec(code_obj, self.user_global_ns, self.user_ns) File "<ipython-input-3-a871fdc9ebee>", line 1, in <module> assert False AssertionError
assert 1!=1也会抛出异常
