“ValueError: zero length field name in format” error in Python 3.0,3.1,3.2

Question

I\'m trying learn Python (3 to be more specific) and I\'m getting this error:

ValueError: zero length field name in format

I googled it and

Answer 1

Python 2.6 and 3.0 require the field numbers. In Python 2.7 and later and 3.1 and later, they can be omitted.

Changed in version 2.7: The positional argument specifiers can be omitted, so '{} {}' is equivalent to '{0} {1}'.

python2.6.4>>> print '|{0:^12}|{1:^12}|'.format(3,4)
|     3      |     4     |