ValueError: zero length field name in format in Python2.6.6
format, python
Solution
In Python versions 2.6 or earlier, you need to explicitly number the format fields:
':'.join("{0:x}\n".format(random.randint(0, 2**16 - 1)) for i in range(4))
# ^
You can read about this in the docs:
Changed in version 2.7: The positional argument specifiers can be omitted, so `'{} {}'` is equivalent to `'{0} {1}'`.
Problem
I use this python shell to generate a string: ``` >>>':'.join("{:x}\n".format(random.randint(0, 2**16 - 1)) for i in range(4)) ``` When I run this shell in Python2.7.5, everything goes okay. But it occurs `ValueError: zero length field name in format` when Python version is `2.6.6`. What should I run this shell fine when Python version is `2.6.6`?