1. 调试

pdb : python debugger,c是下一步

python的浮点数算数错误

>>> 1.1 + 2.2
3.3000000000000003

使用pdb.set_trace()下断点

import pdb
pdb.set_trace()

1.1. assert

assert expression

等价于

if not expression:
    raise AssertionError

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