Python function day-3

def(*args):Print(Args,type (args)) Li= [11,22,33,44]f1 (LI)#use Li as *args to output a tuple with only one LI elementF1 (*li)#add * Rather li element traversal and join to tuple#Print Results([11,22,33,44])(11,22,33,44)def(**Keargs):Print(Kwargs,type (Kwargs)) DiC= {'K1': 123,'K2': 345}#F1 (DIC) is wrongF1 (k1=dic) F1 (**dic)#How to pass a dictionary#Print Results{'K1': {'K1': 123,'K2': 345}} <class 'Dict'>{'K1': 123,'K2': 345} <class 'Dict'>

First, the syntax:

def function name ():    function Body     return value

Α.return returns a value that, if no return value, returns none by default

B. As soon as the return is executed in the function, the code below the function is not executing

Second, the parameters

A. Formal parameters

B. Actual parameters

C. Default parameters: Default parameters must be put in the tail, or will be an error

D. Dynamic Parameters

def F (*args): the type of print(args)       #A is a tuple, only the parameters that can be passed in are tuple elements  def F1 (**kwargs):   # is also a dynamic parameter, but must pass the value of the dictionary type, key=values the form of the value of print(Kwargs)  

E. Universal parameters: Def (P,*args,**kwargs): #表示上述的综合. *a returns a tuple, which is also a tuple element, **a returns DICT, and the dict element is passed in.

F. Incoming list, tuple, tuple for dynamic parameters

def(*args):Print(Args,type (args)) Li= [11,22,33,44]f1 (LI)#use Li as *args to output a tuple with only one LI elementF1 (*li)#add * Rather li element traversal and join to tuple

#Print Results([11,22,33,44])(11,22,33,44)-----------------------------Split Line---------------------------def(**Keargs):Print(Kwargs,type (Kwargs)) DiC= {'K1': 123,'K2': 345}#F1 (DIC) is wrongF1 (k1=dic) The value of #创建了一个只有一个key (K1) is the dictionary of DIC F1 (**dic)#How to pass a dictionary#Print Results{'K1': {'K1': 123,'K2': 345}} <class 'Dict'>{'K1': 123,'K2': 345} <class 'Dict'>

G. Global variables

# DECLARE global variables in uppercase
P = 135     def  fun1 ():    = 123  # Local, can only call global # in the function body      Global variables, all functions can be shared. You can use global p to manipulate p in a function.     p= 246    print(a,p)def  fun2 ():    #  Locally, only in function weight call    print(a,p)  #这个P值变成了246 Note that the value of the global variable P has been modified successfully FUN1 () fun2 ()


#打印结果

123 246
456 246

Python function day-3