assert的基本語法是：
"assert" expression1 ["," expression2]
expression1用於判斷生成布爾值，當expression1為假的時候，則拋出異常，[]中的內容可選，即用戶可以選擇異常的提示值：
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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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