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