是否有可能分割字符串每n个字符?
例如，假设我有一个包含以下内容的字符串:
'1234567890'
我怎样才能让它看起来像这样:
['12','34','56','78','90']
关于列表的相同问题，请参见如何将列表分割为大小相等的块?。同样的技术通常适用，尽管有一些变化。
当前回答
试试这个:
s='1234567890'
print([s[idx:idx+2] for idx,val in enumerate(s) if idx%2 == 0])
输出:
['12', '34', '56', '78', '90']
其他回答
试试这个:
s='1234567890'
print([s[idx:idx+2] for idx,val in enumerate(s) if idx%2 == 0])
输出:
['12', '34', '56', '78', '90']
这些答案都很好，很有用，但是语法太神秘了……为什么不写一个简单的函数呢?
def SplitEvery(string, length):
if len(string) <= length: return [string]
sections = len(string) / length
lines = []
start = 0;
for i in range(sections):
line = string[start:start+length]
lines.append(line)
start += length
return lines
简单地叫它:
text = '1234567890'
lines = SplitEvery(text, 2)
print(lines)
# output: ['12', '34', '56', '78', '90']
>>> from functools import reduce
>>> from operator import add
>>> from itertools import izip
>>> x = iter('1234567890')
>>> [reduce(add, tup) for tup in izip(x, x)]
['12', '34', '56', '78', '90']
>>> x = iter('1234567890')
>>> [reduce(add, tup) for tup in izip(x, x, x)]
['123', '456', '789']
我喜欢这个解决方案:
s = '1234567890'
o = []
while s:
o.append(s[:2])
s = s[2:]
我认为这比itertools版本更短，更可读:
def split_by_n(seq, n):
'''A generator to divide a sequence into chunks of n units.'''
while seq:
yield seq[:n]
seq = seq[n:]
print(list(split_by_n('1234567890', 2)))
