CODEWITHSUNDEEP
pythonlistpython-2.7
naz
naz

Reputation: 2072

Creating a list through multiplication

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?

Upvotes: 1

Views: 161

Answers (3)

Jordan A.
Jordan A.

Reputation: 384

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.

Upvotes: 1

Vishnu Upadhyay
Vishnu Upadhyay

Reputation: 5061

() (,) 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

Upvotes: 3

u354356007
u354356007

Reputation: 3215

[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.

Upvotes: 6

Related Questions