python - 多行字符串的正确缩进？

Question

函数中 Python 多行字符串的正确缩进是什么？

    def method():
        string = """line one
line two
line three"""

或

    def method():
        string = """line one
        line two
        line three"""

还是别的什么？

在第一个示例中，将字符串卡在函数之外看起来有点奇怪。

Answer 1

您可能想与 """

对齐

def foo():
    string = """line one
             line two
             line three"""

由于换行符和空格包含在字符串本身中，因此您必须对其进行后处理。如果您不想这样做并且您有大量文本，您可能希望将其单独存储在文本文件中。如果文本文件不适用于您的应用程序并且您不想进行后处理，我可能会选择

def foo():
    string = ("this is an "
              "implicitly joined "
              "string")

如果您想对多行字符串进行后处理以删除不需要的部分，您应该考虑 textwrap PEP 257 中介绍的模块或后处理文档字符串的技术:

def trim(docstring):
    if not docstring:
        return ''
    # Convert tabs to spaces (following the normal Python rules)
    # and split into a list of lines:
    lines = docstring.expandtabs().splitlines()
    # Determine minimum indentation (first line doesn't count):
    indent = sys.maxint
    for line in lines[1:]:
        stripped = line.lstrip()
        if stripped:
            indent = min(indent, len(line) - len(stripped))
    # Remove indentation (first line is special):
    trimmed = [lines[0].strip()]
    if indent < sys.maxint:
        for line in lines[1:]:
            trimmed.append(line[indent:].rstrip())
    # Strip off trailing and leading blank lines:
    while trimmed and not trimmed[-1]:
        trimmed.pop()
    while trimmed and not trimmed[0]:
        trimmed.pop(0)
    # Return a single string:
    return '\n'.join(trimmed)