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。
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
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']
其他回答
python中已经有一个内置的函数。
>>> from textwrap import wrap
>>> s = '1234567890'
>>> wrap(s, 2)
['12', '34', '56', '78', '90']
这是wrap的文档字符串说的:
>>> help(wrap)
'''
Help on function wrap in module textwrap:
wrap(text, width=70, **kwargs)
Wrap a single paragraph of text, returning a list of wrapped lines.
Reformat the single paragraph in 'text' so it fits in lines of no
more than 'width' columns, and return a list of wrapped lines. By
default, tabs in 'text' are expanded with string.expandtabs(), and
all other whitespace characters (including newline) are converted to
space. See TextWrapper class for available keyword args to customize
wrapping behaviour.
'''
试试下面的代码:
from itertools import islice
def split_every(n, iterable):
i = iter(iterable)
piece = list(islice(i, n))
while piece:
yield piece
piece = list(islice(i, n))
s = '1234567890'
print list(split_every(2, list(s)))
使用groupby的解决方案:
from itertools import groupby, chain, repeat, cycle
text = "wwworldggggreattecchemggpwwwzaz"
n = 3
c = cycle(chain(repeat(0, n), repeat(1, n)))
res = ["".join(g) for _, g in groupby(text, lambda x: next(c))]
print(res)
输出:
['www', 'orl', 'dgg', 'ggr', 'eat', 'tec', 'che', 'mgg', 'pww', 'wza', 'z']
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)))
>>> line = '1234567890'
>>> n = 2
>>> [line[i:i+n] for i in range(0, len(line), n)]
['12', '34', '56', '78', '90']