string.split()出现意外行为

假设我有一根绳子, string = 'a'

我愿意 string.split() ['a']

string = 'a b c d'

到目前为止,我已经尝试了以下所有方法,但都没有成功:

>>> a = 'a'
>>> a.split()
['a']
>>> a = 'a b'
>>> a.split(' ')
['a', 'b']
>>> a = 'a'
>>> a.split(' ')
['a']
>>> import re
>>> re.findall(r'\S+', a)
['a']
>>> re.findall(r'\S', a)
['a']
>>> re.findall(r'\S+', a)
['a', 'b']
>>> re.split(r'\s+', a)
['a', 'b']
>>> a = 'a'
>>> re.split(r'\s+', a)
['a']
>>> a.split(" ")
['a']
>>> a = "a"
>>> a.split(" ")
['a']
>>> a.strip().split(" ")
['a']
>>> a = "a".strip()
>>> a.split(" ")
['a']

我疯了吗?我在字符串“a”中没有看到空格。

>>> r"[^\S\n\t]+"
'[^\\S\\n\\t]+'
>>> print(re.findall(r'[^\S\n\t]+',a))
[]

编辑

FWIW,这就是我如何得到我所需要的:

# test for linked array
if typename == 'org.apache.ctakes.typesystem.type.textsem.ProcedureMention':
    for f in AnnotationType.all_features:
        if 'Array' in f.rangeTypeName:
            if attributes.get(f.name) and typesystem.get_type(f.elementType):
                print([ int(i) for i in attributes[f.name].split() ])