我有一个很长的疑问。我想用Python将它分成几行。在JavaScript中实现这一点的一种方法是使用几个句子并用+运算符将它们连接起来(我知道,也许这不是最有效的方法,但我并不真正关心这个阶段的性能,只是代码的可读性)。例子:

var long_string = 'some text not important. just garbage to' +
                      'illustrate my example';

我尝试在Python中做类似的事情,但没有成功,所以我使用了\来拆分长字符串。然而,我不确定这是否是唯一/最好/最蟒蛇的做法。看起来很尴尬。实际代码:

query = 'SELECT action.descr as "action", '\
    'role.id as role_id,'\
    'role.descr as role'\
    'FROM '\
    'public.role_action_def,'\
    'public.role,'\
    'public.record_def, '\
    'public.action'\
    'WHERE role.id = role_action_def.role_id AND'\
    'record_def.id = role_action_def.def_id AND'\
    'action.id = role_action_def.action_id AND'\
    'role_action_def.account_id = ' + account_id + ' AND'\
    'record_def.account_id=' + account_id + ' AND'\
    'def_id=' + def_id

当前回答

我通常用这样的词:

text = '''
    This string was typed to be a demo
    on how could we write a multi-line
    text in Python.
'''

如果要删除每行中烦人的空格,可以执行以下操作:

text = '\n'.join(line.lstrip() for line in text.splitlines())

其他回答

我喜欢这种方法,因为它有阅读的特权。在我们有长串的情况下,没有办法!根据您所处的缩进级别,每行仍限于80个字符。。。好没必要说别的

在我看来,Python风格指南仍然非常模糊。我采用了埃罗·奥尔顿的方法,因为它有利于阅读和常识。我明白,风格指南应该帮助我们,而不是让我们的生活一团糟。

class ClassName():
    def method_name():
        if condition_0:
            if condition_1:
                if condition_2:
                    some_variable_0 =\
"""
some_js_func_call(
    undefined,
    {
        'some_attr_0': 'value_0',
        'some_attr_1': 'value_1',
        'some_attr_2': '""" + some_variable_1 + """'
    },
    undefined,
    undefined,
    true
)
"""

我认为当代码(例如,变量)缩进并且输出字符串应该是单行(没有换行)时,另一个选项更可读:

def some_method():

    long_string = """
A presumptuous long string
which looks a bit nicer
in a text editor when
written over multiple lines
""".strip('\n').replace('\n', ' ')

    return long_string

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。

用\换行对我很有用。下面是一个例子:

longStr = "This is a very long string " \
        "that I wrote to help somebody " \
        "who had a question about " \
        "writing long strings in Python"

我通常用这样的词:

text = '''
    This string was typed to be a demo
    on how could we write a multi-line
    text in Python.
'''

如果要删除每行中烦人的空格,可以执行以下操作:

text = '\n'.join(line.lstrip() for line in text.splitlines())