Query on the below Python Output

Question

I am printing the list variable as:

lst=("Python",)*3
print(lst)
lst=("Python")*3
print(lst)

and the output is

('Python', 'Python', 'Python')
PythonPythonPython

Definitely the output is different due to the comma(,) used in the first print statement. But the first statement does not have two values either.

Can someone describe the technical reason behind this?

("Python",) creates a 1-tuple and ("Python") is just a string in brackets. In fact, the brackets don't do anything here, just "Python", will create the same tuple. As a side note, () will create an empty tuple. — eugenhu
– eugenhu, Commented Feb 11, 2018 at 5:19
Adding the comma just makes it a tuple. ("1", "2") * 2 = ("1", "2", "1", "2") — Wright
– Wright, Commented Feb 11, 2018 at 5:21
This page has a bit more detail on tuple syntax, wiki.python.org/moin/TupleSyntax. — eugenhu
– eugenhu, Commented Feb 11, 2018 at 5:23

Stephen Rauch · Accepted Answer · 2018-02-11 05:43:59Z

2

A trailing , creates a tuple

"Python",

is a tuple of length 1, so

lst=("Python",)*3

Is a tuple of length 3:

('Python', 'Python', 'Python')

("Python")

is a string, and thus:

lst=("Python")*3

is a string that is repeated three times:

PythonPythonPython

answered Feb 11, 2018 at 5:22

Stephen Rauch♦

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