Python infinite traversal for data acquisition in multidimensional nested dictionaries, lists, and tuples of JSON

Interface returns the possibility of nested lists in JSON data, and nested dictionaries within a list,

In the process of interface automation, it is necessary to obtain the corresponding value directly through a key value, so we have the following function

Not much to say, on the code:

#!/usr/bin/python#Coding:utf-8"""@author: bingo.he @file: get_target_value.py @time: 2017/12/22"""defGet_target_value (Key, DIC, tmp_list):""":p Aram Key: Target key value:p Aram Dic:json data:p Aram Tmp_list: Used to store acquired data: Return:list"""    if  notIsinstance (DIC, Dict)or  notisinstance (Tmp_list, list): # format check for incoming data          return 'Argv[1] Not a dict or argv[-1] not a list'
    ifKeyinchDic.keys (): Tmp_list.append (Dic[key])#incoming data is stored tmp_list    Else:         forValueinchDic.values ():#traversal of the value of an incoming data if it does not conform            ifisinstance (value, dict): Get_target_value (key, Value, Tmp_list)#The value of the incoming data is a dictionary, which calls itself directly            elifisinstance (value, (list, tuple)): _get_value (key, Value, Tmp_list)#if the value of the incoming data is a list or a tuple, call _get_value    returntmp_listdef_get_value (Key, Val, tmp_list): forVal_inchVal:ifisinstance (Val_, Dict): Get_target_value (Key, Val_, tmp_list)#if the value of the incoming data is a dictionary, call Get_target_value        elifisinstance (Val_, (list, tuple)): _get_value (Key, Val_, tmp_list)#if the value of the incoming data is a list or a tuple, call itself

：

A simple test of a function that can get the desired value from a complex set of multiple nested data

Holes encountered when writing this function:

Initially, the blogger stores the temporary list of retrieved data into the parameters, so that the call can pass a parameter less.

def Get_target (A, b=[]):    b.append (a)    print(b)

Get_target (1)

However, it turns out that there is no problem with a single call, but when multiple calls are made, the value of the last call is returned.

Could be a bug in the Python function itself

And then we looked at a lot of information. The default value of the parameter is only initialized once for the function declaration, and then no longer initialized

def foo (a=[]) and foo (a=[]): The former is the default value of the parameter, the latter is keyword arguments

The following code definition and invocation is also a slight difference between

def foo (*args, * *Kargs)    :pass    foo (*args, **kargs)

Python infinite traversal for data acquisition in multidimensional nested dictionaries, lists, and tuples of JSON