Python 2中具有任意长度列表的.format（）格式化字符串的最优雅方法？

Question

Recently I was rewriting code in which a string variable was assigned in following way:

mylist = [1.0, 2.0, 3.0]
somestring = '%6.3f' * len(mylist) % tuple(mylist)

In [7]: somestring

Out[7]: ' 1.000 2.000 3.000'

I would like to figure out how to do same using the .format() method. I ended up with following:

somestring = ''.join('{:6.3f} ' for i in mylist).format(*mylist)
In [16]: somestring

Out[16]: ' 1.000  2.000  3.000 '

Is there any way to do it "better"? (also in one line?)

Answer 1

Just as you can use % on the multiplied string, you can use .format() on the multiplied string. You need to use parentheses to keep it contained, though:

somestring = ('{:6.3f}' * len(mylist)).format(*mylist)