Question

Alright, i need to make a string defined as rootString that looks like this:

F:0.0

The letter F is derived from a previous string, obtained by:

root = str(newickString[-1])

And the float 0.0 can be as such:

rootD = 0.0

My question is, how do I combine both variable name and float value with a colon?

Answer 1

>>> string = 'WWF'
>>> num = 0.0
>>> print ("{0}:{1}".format(string[-1],num))
F:0.0

On older versions of Python (<2.6) you will need to do:

"%s:%s" % (string[-1], num)

instead of

"{0}:{1}".format(string[-1],num)