在python中用逗号分隔的现有字符串添加新的字符串值

Question

I wanted to add strings to the already existing string with comma separtaed values.

For example old_string = 'a@q' Now if I get one new_string1= 'b@q'

Then what I need is old_string = 'a@q,b@q'

Then if I get new_string2='c@q'

Then What I should get here is old_string='a@q,b@q,c@q'

What I tried here is

 my_string='a@q'
>>> new_string='b@q'
>>> my_string=','.join(new_string)
>>> my_string
'b,@,q'

But that is not output I am expecting here. I am new to python .Can some one help me in this

Answer 1

.join usually adds items in lists. I will concatenate two strings with + operator and add to my_string:

my_string+=","+new_string

Now my_string will be 'a@q,b@q'

If you have two different variables and want to concatenate them:

old_string='a@q'
new_string='b@q'
my_string=old_string+","+new_string

Answer 2

您可以使用可迭代列表并join其中。

','.join([old_string, new_string])