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Preface
When defining a function , We just need to determine the name and location of the parameter , The interface definition of the function is finished .
Positional arguments
stay power(x) in ,x This is the position parameter , Calling this parameter has and only one parameter
seek x² Function of , The code is as follows ：
>>>def power(x): return x * x |
When there are multiple parameters , take power(x) Change it to power(x,n), It includes two parameters x and n, And both parameters are positional parameters , When you call a function , The two values passed in are assigned to the parameter in order of position x and n
seek x Of n Power , The code is as follows ：
>>>def power(x, n): s = 1 while n > 0: n = n - 1 s = s * x return s |
Default parameters
1、 Because we often calculate x², So we can take the second parameter n The default value of is set to 2, namely n=2 Is the default parameter
>>>def power(x, n=2): s = 1 while n > 0: n = n - 1 s = s * x return s |
When n>2 when , You need clear input n Value , Such as ：power(x,100)
2.、 When setting default parameters , There are two points to pay attention to ：
First, the required parameters are in front of , The default parameter is after .
The second is how to set the default parameters ： When a function has more than one parameter , Put the variable parameters ahead , Change small parameters behind . The parameter with small change can be used as the default parameter .
Variable parameters
Variable parameter is that the number of parameters passed in is variable
When we determine the input parameters , The code is as follows ：
>>>def calc(numbers): sum = 0 for n in numbers: sum = sum + n * n return sum >>> calc([1,2,3]) 14 |
When we change the parameter to a variable parameter , The code is as follows ：
def calc(*numbers): sum = 0 for n in numbers: sum = sum + n * n return sum >>>calc(1,2) 5
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