Python 抛出异常
抛出异常
作为 Python 开发者，如果出现某个条件，您可以选择抛出异常。
要抛出（或引发）异常，请使用 raise 关键字。
示例
Raise an error and stop the program if x is lower than 0
x = -1
if x < 0
raise Exception("Sorry, no numbers below zero")
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The raise keyword is used to raise an exception.
You can define what kind of error to raise, and the text to print to the user.
示例
Raise a TypeError if x is not an integer
x = "hello"
if not type(x) is int
raise TypeError("Only integers are allowed")
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