Question

我有这个例子

a='Datenfernübertragung remote data transmission|long-distance data transmission|long-distance data transfer|remote data transmission   Preferred|Forbidden|Forbidden|'
b = a.split('\t')
for item in b[1].split('|'):
  indeks=b[1].split('|').index(item)
  print(indeks)

并且此时返回0, 1, 2, 0这是remote data transmission|long-distance data transmission|long-distance data transfer|remote data transmission的索引，但为什么它返回索引0而不是打印索引3？

由于

Answer 1

Python 3.4.3 (default, Nov 17 2016, 01:11:57) 
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a='Datenfernübertragung remote data transmission|long-distance data transmission|long-distance data transfer|remote data transmission   Preferred|Forbidden|Forbidden|'
>>> b = a.split('\t')
>>> b
['Datenfernübertragung remote data transmission|long-distance data transmission|long-distance data transfer|remote data transmission   Preferred|Forbidden|Forbidden|']
>>> b[1]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list index out of range

字符串中没有任何 \ t ，b是单项列表，其索引为零。因此，您的代码段完全错误。

据我所知，您已尝试为字符串中的竖线条分隔值派生索引。希望这段代码能够以一种非常简洁的方式完成：

>>> for i, j in enumerate(a.split('|')):
...     print(i, j)
... 
0 Datenfernübertragung remote data transmission
1 long-distance data transmission
2 long-distance data transfer
3 remote data transmission   Preferred
4 Forbidden
5 Forbidden
6

列表上的Python迭代

1 个答案: