Why does adding a trailing comma after a variable name make it a tuple?

Question

I want to know that why adding a trailing comma after a variable name (in this case a string) makes it a tuple. i.e.

>>> abc = \'mystr         


        

Answer 1

In the question's example, you assigned the variable 'abc' to a Tuple with a length of 1.

You can do multiple assignments with this similar syntax:

x,y = 20,50

Also note that the print statement has a special understanding for ending a print statement with a comma; This tells print to omit the trailing newline.

print 'hello',
print 'world'

result:

hello world