how to list into string in python code example

Example: python list to string

mystring = 'hello, world'

mylist = string1.split(', ') #output => ['hello', 'world']

myjoin1 = ', '.join(mylist) #output => 'hello, world'
myjoin2 = ' '.join(mylist) #output => 'hello world'
myjoin3 = ','.join(mylist) #output => 'hello,world'