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This article mainly shows you "how python creates functions". The content is simple and easy to understand. It is clearly organized. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn "how python creates functions".

One: Create a function:

A function can be called (possibly including arguments, i.e. values enclosed in parentheses), performs some behavior and returns a value. In general, the built-in callable function can be used to determine whether a function is callable (callable is not available in Python 3.x):

Function definition:

Format: def Function Name (Parameter):

return (statement)

def hello(name):

return ('hello'+ name)

>>> def hello(name):

... return('ilove'+name)

>>> print(hello('ly'))

ilovely

>>>

>>> def fibs(num):

... result=[0,1]

... for i in range(num-2):

... result.append(result[-2]+result[-1])

... return(result)

...

>>> fibs(10)

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]

>>>

II. Record function: add remarks

For example:

>>> def fibs(num):

... 'itis a defin' //docstring

... result=[0,1]

... for i in range(num-2):

... result.append(result[-2]+result[-1])

... return(result)

...

>>>

>>> fibs(10)

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]

>>>

Python function can return no value (return is null, return is None)

IV. Parameters:

The parameters that follow the function are generally called formal parameters, and the values provided when the function is called are the actual parameters. A parameter is just a variable. Assigning new values to parameters inside a function does not change the values of external variables, and similarly, rebinding parameters inside a function does not affect variables outside the function.

Parameters stored in local scope

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