24 lines
1.3 KiB
Markdown
24 lines
1.3 KiB
Markdown
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---
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title: Python Defining Functions
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localeTitle: Python定义函数
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---
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[Python文档](https://docs.python.org/3/tutorial/controlflow.html#defining-functions)
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我们可以创建一个将Fibonacci系列写入任意边界的函数：
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```
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>>> def fib(n): # write Fibonacci series up to n
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... """Print a Fibonacci series up to n."""
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... a, b = 0, 1
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... while a < n:
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... print(a, end=' ')
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... a, b = b, a+b
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... print()
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...
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>>> # Now call the function we just defined:
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... fib(2000)
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0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597
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```
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[`def`](https://docs.python.org/3/reference/compound_stmts.html#def)关键字引入了函数定义。它必须后跟函数名称和带括号的形式参数列表。构成函数体的语句从下一行开始，必须缩进。
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函数体的第一个语句可以选择是字符串文字;此字符串文字是函数的文档字符串或[docstring](https://www.python.org/dev/peps/pep-0257/) （有关文档[字符串的](https://www.python.org/dev/peps/pep-0257/)更多信息，请参阅文档字符串部分）。有些工具使用文档字符串自动生成在线或印刷文档，或让用户以交互方式浏览代码。在你编写的代码中包含docstrings是一种很好的做法，所以尽量养成习惯。
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