When playing with a code I have noticed that [0,]*6, does not return [0,0,0,0,0,0,] but rather [0,0,0,0,0,0]. Can you please explain why?
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just give enter after `[0,]` in idle. It would print `[0]` – Avinash Raj Sep 03 '15 at 09:10
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They're the same. The last comma is redundant. – khelwood Sep 03 '15 at 09:12
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possible duplicate of [Why does Python allow a trailing comma in list?](http://stackoverflow.com/questions/11597901/why-does-python-allow-a-trailing-comma-in-list) – moooeeeep Sep 03 '15 at 09:16
3 Answers
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[0,0,0,0,0,0,] and [0,0,0,0,0,0] are the same lists. Last comma is acceptable by python syntax analyzer in order to distinguish a variable and a tuple with a variable inside: (1) is int, (1,) is tuple.
u354356007
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() (,) is different 1st shows value and other is tuple, while in case of list [] and [,] both presentation is same.
In [4]: [0,]*6
Out[4]: [0, 0, 0, 0, 0, 0]
In [5]: [0]*6
Out[5]: [0, 0, 0, 0, 0, 0]
In [6]: (1,)*6
Out[6]: (1, 1, 1, 1, 1, 1)
In [7]: (1)*6
Out[7]: 6
In [8]: [0,] == [0]
Out[8]: True
In [9]: (0,) == (0)
Out[9]: False
Vishnu Upadhyay
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Lists do not end with commas. It's just the way the syntax goes. However, Python will think the ('hello world') to be a string. To make a tuple, you must end it with a comma ('hello world',). So, in your case, Python thought [0,] to be equivalent to [0]. It's just the way the syntax goes.
Jordan A.
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