如何让用户从字符串中选择一个单词

Question

如何让用户（输入）从一个句子/字符串中选择一个单词，然后使用python 3.4.3打印出所选单词的位置???

Answer 1

>>> foo = 'This is a sentence' 
>>> foo 
'This is a sentence' 
>>> choice = input('Choose a word from the sentence ') 
Choose a word from the sentence is 
>>> foo = foo.split() 
>>> foo 
['This', 'is', 'a', 'sentence'] 
>>> if choice in foo: 
...  print(foo.index(choice)) 
... 
1 
>>> 

开关从列表回字符串

>>> foo = ' '.join(foo) 
>>> foo 
'This is a sentence' 
>>>