docstring阻塞elif语句

Question

让我跳过我所拥有的确切代码:这是short模块

class SentenceSplitter:

def __init__(self, filename=None):
    self._raw_text = self.raw_text(filename)
    self._sentences = self.to_sentences()


def raw_text(self, filename):
    text = ''
    with open(filename, 'r') as file:
        for line in file.readlines():
            line = line.strip()
            text += ''.join(line.replace(line, line+' '))
    file.close()
    text = text.strip() # Deal with the last whitespace
    return text

def to_sentences(self):
    """ Sentence boundaries occur at '.', '!', '?' except that,
    there are some not-sentence boundaries that
    may occur before/after the period.
    """
    raw_text = self._raw_text
    sentences = []
    sentence = ''
    boundary = None

    for char in raw_text:
        sentence += ''.join(char)
        if char == '!' or char == '?':
            sentences.append(sentence)
            sentence = ''

        """ The sign -> refers to 'followed by' """
        elif char == '.':
            i = raw_text.index(char) # slicing previous/following characters
            boundary = True

        if boundary:
            sentences.append(sentence)
            sentence = ''

    return sentences

主要的是：

import textchange

ss = textchange.SentenceSplitter(filename='text.txt')
print(ss._sentences)

第一个if语句后的文档字符串

""" The sign -> refers to 'followed by' """

我把它注释掉了，程序运行了，否则就不会了。elif语句中有更多的代码，但在确保它仍然抛出错误后将其删除。下面是回溯：

Traceback (most recent call last):
File "D:\Programs\Python 3.3.2\Tutorials\46 Simple Python Exercises.py", line 26, in        
<module>
import textchange
File "D:\Programs\Python 3.3.2\Tutorials\textchange.py", line 51
elif char == '.':
   ^
SyntaxError: invalid syntax

Answer 1

Docstring只是在函数开始处找到的字符串文字。它们仍然必须遵循缩进规则。

您的字符串没有正确地缩进到elif块中；通过在前面从if块中缩进，您完全结束了if-elif-else块，并且不允许跟随任何elif。

使用常规的、普通的注释，以#开头的行；仅包含注释的行不受缩排规则的约束：

if char == '!' or char == '?':
    sentences.append(sentence)
    sentence = ''

# The sign -> refers to 'followed by'
elif char == '.':
    i = raw_text.index(char) # slicing previous/following characters
    boundary = True

或者缩进字符串(它仍然完全由Python作为代码执行，但不会被赋值，因此再次被丢弃)：

if char == '!' or char == '?':
    sentences.append(sentence)
    sentence = ''

elif char == '.':
    """ The sign -> refers to 'followed by' """
    i = raw_text.index(char) # slicing previous/following characters
    boundary = True