Python - how to write strings to file without quotes and spaces?

Is it possible to write into file string without quotes and spaces (spaces for any type in list)?

For example I have such list:

['blabla', 10, 'something']

How can I write into file so line in a file would become like:

blabla,10,something

Now every time I write it into file I get this:

'blabla', 10, 'something'

So then I need to replace ' and ' ' with empty symbol. Maybe there is some trick, so I shouldn't need to replace it all the time?