assert的基本语法是：
"assert" expression1 ["," expression2]
expression1用于判断生成布尔值，当expression1为假的时候，则抛出异常，[]中的内容可选，即用户可以选择异常的提示值：
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>>>a
=
23
>>>
assert
a
=
=
23
>>>a
=
a
-
1
>>>
assert
a
=
=
23
Traceback (most recent call last):
File
"<stdin>"
, line
1
,
in
<module>
AssertionError
>>>
assert
a
=
=
23
,
"error1"
Traceback (most recent call last):
File
"<stdin>"
, line
1
,
in
<module>
AssertionError: error1
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