如何在 Python2 中嵌套格式字符串？

Question

formatter = "%r %r %r %r"
print formatter % (formatter, formatter, formatter, formatter) % ((1, 2, 3, 4), (1, 2, 3, 4), (1, 2, 3, 4), (1, 2, 3, 4))


Traceback (most recent call last):
  File "ex8.py", line 2, in <module>
    print formatter % (formatter, formatter, formatter, formatter) % ((1, 2, 3, 4), (1, 2, 3, 4), (1, 2, 3, 4), (1, 2, 3, 4))
TypeError: not enough arguments for format string

Is something wrong with my code? Or just can't do it.

Answer 1

You should use just one tuple for your formatting:

formatter = "%r %r %r %r"
print formatter % (formatter, formatter, formatter, formatter) % (1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4)

If you want it to be more clear, you could do this:

formatter = "%r %r %r %r"
tuples = ((1, 2, 3, 4), (1, 2, 3, 4), (1, 2, 3, 4), (1, 2, 3, 4))
print formatter % (formatter, formatter, formatter, formatter) % sum(tuples, ())

or better:

formatter = "%r %r %r %r"
tuples = (1, 2, 3, 4) * 4
print formatter % ((formatter,) * 4) % tuples