Question

a = ('a', 'b', 'c')
print( ''.join(a) )

What is the meaning of '' on the line two? Does string module and this '' object has any difference?

Answer 1

'' means an empty string to which we join another string. It’s a more pythonic way to do string concatenation.

Check this out for more insights: http://www.skymind.com/~ocrow/python_string/

PEP3126 Says (although its rejected):

Instead of:

“abc” “def” == “abcdef”

authors will need to be explicit, and either add the strings:

“abc” + “def” == “abcdef”

or join them:

“”.join([“abc”, “def”]) == “abcdef”

So, both are same things, join is just more pythonic.