python - 对于 python 字符串连接，%s 是否比 + 快

Question

了解使用 str.join 运算符是在 python 中连接字符串的“选择”方式，我在该类型的优先顺序操作中徘徊:

 "%s %s" % (first_name, last_name)

适合。它们比使用 + 更快还是更慢？

Answer 1

让我们看看:

>>> first_name = 'Test'
>>> last_name = 'Name'

>>> %timeit "%s %s" % (first_name, last_name)
10000000 loops, best of 3: 168 ns per loop

>>> %timeit ' '.join((first_name, last_name))
10000000 loops, best of 3: 157 ns per loop

>>> %timeit first_name + ' ' + last_name
10000000 loops, best of 3: 103 ns per loop

如果你缓存元组:

>>> name_tuple = (first_name, last_name)

>>> %timeit "%s %s" % name_tuple
10000000 loops, best of 3: 125 ns per loop

>>> %timeit ' '.join(name_tuple)
10000000 loops, best of 3: 114 ns per loop