Python分区和拆分 [英] Python partition and split

问题描述

我想使用 split 和 partition 将一个包含两个单词的字符串拆分，例如word1 word2"，然后分别打印(使用 for)这些单词，例如:

I want to split a string with two words like "word1 word2" using split and partition and print (using a for) the words separately like:

Partition:
word1
word2

Split:
word1
word2

这是我的代码:

print("Hello World")
name = raw_input("Type your name: ")

train = 1,2
train1 = 1,2
print("Separation with partition: ")
for i in train1:
    print name.partition(" ")

print("Separation with split: ")
for i in train1:
    print name.split(" ")

这是正在发生的:

Separation with partition: 
('word1', ' ', 'word2')
('word1', ' ', 'word2')

Separation with split: 
['word1', 'word2']
['word1', 'word2']

推荐答案

像 name.split() 这样的命令返回一个列表.您可能会考虑迭代该列表:

A command like name.split() returns a list. You might consider iterating over that list:

for i in name.split(" "):
  print i

因为你写的东西，即

for i in train:
  print name.split(" ")

将执行命令 print name.split(" ") 两次(一次用于值 i=1，一次用于 i=2代码>).两次它会打印出整个结果:

will execute the command print name.split(" ") twice (once for value i=1, and once more for i=2). And twice it will print out the entire result:

['word1', 'word2']
['word1', 'word2']

类似的事情发生在 partition - 除了它返回你分割的元素.所以在这种情况下你可能想要做

A similar thing happens with partition - except it returns the element that you split as well. So in that case you might want to do

print name.partition(" ")[0:3:2]
# or
print name.partition(" ")[0::2]

返回元素 0 和 2.或者，你可以这样做

to return elements 0 and 2. Alternatively, you can do

train = (0, 2,)
for i in train:
  print name.partition(" ")[i]

在循环中连续两次打印元素 0 和 2.请注意，后一种代码效率更低，因为它计算了两次分区.如果你在乎，你可以写

To print element 0 and 2 in two consecutive passes through the loop. Note that this latter code is more inefficient as it computes the partition twice. If you cared, you could write

train = (0,2,)
part = name.partition(" ")
for i in train:
  print part[i]

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