tl；dr：使用“”和“”来换行字符串，如中所示

string = """\
This is a long string
spanning multiple lines.
"""

从Python官方文档中：

字符串文本可以跨越多行。一种方法是使用三引号：“”“…”“”或“”“”…“”。行的结束是自动的包含在字符串中，但可以通过添加\在线路的末端。以下示例：

print("""\
Usage: thingy [OPTIONS]
     -h                        Display this usage message
     -H hostname               Hostname to connect to
""")

生成以下输出（注意，初始换行符不是包括在内）：

Usage: thingy [OPTIONS]
     -h                        Display this usage message
     -H hostname               Hostname to connect to

通常，我对多行注释/string使用list和join。

lines = list()
lines.append('SELECT action.enter code here descr as "action", ')
lines.append('role.id as role_id,')
lines.append('role.descr as role')
lines.append('FROM ')
lines.append('public.role_action_def,')
lines.append('public.role,')
lines.append('public.record_def, ')
lines.append('public.action')
query = " ".join(lines)

您可以使用任何字符串连接所有这些列表元素，如“\n”（换行符）或“，”（逗号）或“”（空格）。

“la”Scala方式（但我认为这是OP要求的最具Python风格的方式）：

description = """
            | The intention of this module is to provide a method to
            | pass meta information in markdown_ header files for
            | using it in jinja_ templates.
            |
            | Also, to provide a method to use markdown files as jinja
            | templates. Maybe you prefer to see the code than
            | to install it.""".replace('\n            | \n','\n').replace('            | ',' ')

如果您希望最后的str没有跳转行，只需将\n放在第二个替换的第一个参数的开头：

.replace('\n            | ',' ')`.

注意：“…templates.”和“另外，…”之间的白线需要在|后面加一个空格。

其他人已经提到了圆括号方法，但我想补充一点，使用圆括号时，允许内联注释。

对每个片段的注释：

nursery_rhyme = (
    'Mary had a little lamb,'          # Comments are great!
    'its fleece was white as snow.'
    'And everywhere that Mary went,'
    'her sheep would surely go.'       # What a pesky sheep.
)

继续后不允许注释：

使用反斜杠行延续符（\）时，不允许使用注释。您将收到一个SyntaxError：一行接一行的连续字符错误。

nursery_rhyme = 'Mary had a little lamb,' \  # These comments
    'its fleece was white as snow.'       \  # are invalid!
    'And everywhere that Mary went,'      \
    'her sheep would surely go.'
# => SyntaxError: unexpected character after line continuation character

Regex字符串的更好注释：

基于以下示例https://docs.python.org/3/library/re.html#re.VERBOSE,

a = re.compile(
    r'\d+'  # the integral part
    r'\.'   # the decimal point
    r'\d*'  # some fractional digits
)

# Using VERBOSE flag, IDE usually can't syntax highight the string comment.
a = re.compile(r"""\d +  # the integral part
                   \.    # the decimal point
                   \d *  # some fractional digits""", re.X)

添加@Levon的答案。。。。

1.创建如下多行字符串：

paragraph = """this is a very
        long string if I had the
        energy to type more and more ..."""

print(paragraph)

输出：

'this is a very\n        long string if I had the\n        energy to type more and more ...'

此字符串将包含换行符和空格。因此，请移除它们。

2.使用正则表达式删除多余的空格

paragraph = re.sub('\s+', ' ', paragraph)
print(paragraph)

输出：

'this is a very long string if I had the energy to type more and more ...'

我使用递归函数来构建复杂的SQL查询。此技术通常可用于构建大型字符串，同时保持代码可读性。

# Utility function to recursively resolve SQL statements.
# CAUTION: Use this function carefully, Pass correct SQL parameters {},
# TODO: This should never happen but check for infinite loops
def resolveSQL(sql_seed, sqlparams):
    sql = sql_seed % (sqlparams)
    if sql == sql_seed:
        return ' '.join([x.strip() for x in sql.split()])
    else:
        return resolveSQL(sql, sqlparams)

P.S.：看看很棒的python-sqlparse库，如果需要，可以打印SQL查询。