a basis function liter python day9 order (1)

Function 
    readability reusability strong 
def function name (): 
      function body 
      return the return value of 
all the functions defined not only will certainly not be invoked to perform 
            call-before-defined 

function name () # does not receive the return value 
return value of the function name = ( ) # receive the return value 

return value 
    does not return a value: the default return None 
        not write return: code execution within the function is completed automatically end 
        write-only return: the end of a function 
        return None 
    return a value: the end of the function and returns a value, it can be any value 
    return multiple values: a plurality of values separated by commas, can be received when a receiving variable (tuples), receiving a plurality of variables may be equivalent amount 

DEF F (a): 
    return 'chestnut' 

RET = f ( 'apple') 
Print (F ( 'apple')) 

parameter 
    parameter definition function when the 
        positional parameters: must pass 
        * args: a plurality of dynamic parameters may be received at any location parameters passed by 
        the default parameters: can not pass - trap 
        ** kwargs: dynamic parameter can take any number of parameters passed by keyword 
    when calling function arguments
        According to the position-parameters 
        follow the keyword-parameters 
            can be mixed prior location parameter must pass keyword parameters 
            can not be repeated to assign a parameter 

def wahaha (* args): 
    Print (args) 

# wahaha (1,2,3,4) 
L = [1,2,3,4] 
wahaha (* l)

qqxing DEF (K, L = {}): 
    # l.append (. 1) 
    L [K] = 'V' 
    Print (L) 

qqxing (. 1) # [. 1] 
qqxing (2) # [1,1] 
qqxing ( 3) # [1,1,1] 

# if the value of the default parameter is a variable data type, 
# then every call functions, 
# if you do not pass a value to the public this type of data resources