Python join:为什么用string.join(list)代替list.join(string)? [英] Python join: why is it string.join(list) instead of list.join(string)?

问题描述

这总是让我感到困惑.看来这样会更好:

This has always confused me. It seems like this would be nicer:

my_list = ["Hello", "world"]
print my_list.join("-")
# Produce: "Hello-world"

胜过这个:

my_list = ["Hello", "world"]
print "-".join(my_list)
# Produce: "Hello-world"

是否有特定原因?

推荐答案

这是因为任何可迭代项都可以连接，不仅是列表，而且结果和"joiner"始终是字符串.

It's because any iterable can be joined, not just lists, but the result and the "joiner" are always strings.

E.G:

import urllib2
print '\n############\n'.join(
    urllib2.urlopen('http://data.stackexchange.com/users/7095'))

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