It is also a question for beginners of Python, about empty tandem and so on.

" I understand that the empty string
[] is an empty string
check the args [0] [: 0] in the code below
use type (args [0] [: 0]) will be marked as < class" list" >
compare it with [] ("d"]) successfully executed
executed print (adder1 ("god", "damn", "it")) reported
does not know the difference. 

def adder1(*args):
    if type(args[0])==type(0):
        sum = 0
    else:
        sum = args[0][:0]
    for arg in args:
        sum = sum + arg
    return sum

print(adder1("god","damn","it"))
print(adder1(["a","b"],["c","d"]))
Python
Mar.10,2021

if you analyze the calculation process in detail, you will find the difference. The python variable parameter * para will compose the parameters into tuple storage. Therefore, 

adder1("god","damn","it") -sharp args = ("god","damn","it")
adder1(["a","b"],["c","d"]) -sharp args = (["a","b"],["c","d"])

anyone with a solid foundation of python knows 

-sharp args = ("god","damn","it")
args[0][:0] = ''
-sharp args = (["a","b"],["c","d"])
args[0][:0] = []

is obviously two different types, one is ', an empty string, and the other is an empty list of [] . In python, both the string and list can be computed directly
, so there is the above result.

Previous: Looking for python desktop application development tutorials suitable for rookies

Next: Does css display support list-item inline?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bf53b7-31f56.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf53b7-31f56.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?