Python 中 elif 语句的语法错误

Question

我在 Python 2.7 中编写的这段代码遇到了一些麻烦。它在 elif 语句上给我一个语法错误，但没有任何解释，我在代码中找不到任何合理的错误。（typeline是我定义的方法。）

num = randrange(-25,15)
""" Toxic """
if num >= -25 and num < -10:
        responses = ["Ugh, nasty.", "That was absolutely disgusting.", "My stomach feels like it's going to explode.", "Pardon me if I puke."]
        typeline(responses[randrange(0,4)], "jack")
        return [num, "Jack ate a VERY TOXIC FRUIT and survived.", "Jack ate a VERY TOXIC FRUIT and died."]
""" Mildly poisonous """
elif num >= -10 and num < 0: """ SYNTAX ERROR HERE """
        responses = ["Yuck", "It's kinda bitter.", "Tastes like an unripe banana.", "It's not so bad."]
        typeline(responses[randrange(0,4)], "jack")
        return [num, "Jack ate a MILDLY TOXIC FRUIT and survived.", "Jack ate a MILDLY TOXIC FRUIT and died."]
""" Healthy """
else:
        responses = ["Definitely not too bad", "It's almost kind of tasty!", "Should I make a jam out of this?", "This is my new favorite fruit."]
        typeline(responses[randrange(0,4)], "jack")
        return [num, "Jack ate a HEALTHY FRUIT and was rescued.", "Jack ate HEALTHY FRUIT and survived."]

错误：

  File "<stdin>", line 9
    elif num >= -10 and num < 0:
       ^
SyntaxError: invalid syntax

Answer 1

您在 elif:

之前有一个未缩进的三引号字符串文字

""" Mildly poisonous """
elif num >= -10 and num < 0:

"""...""" 字符串文字是 而不是 多行注释。他们创建字符串，只是因为您随后忽略了生成的字符串对象，所以 Python 才会忽略该行。它们仍然是 Python 语法的一部分；使用时不能忽略缩进规则。

改为使用正确的 # 评论：

# Toxic
if num >= -25 and num < -10:
    # ...
# Mildly poisonous
elif num >= -10 and num < 0:
    # ...
# Healthy
else:
    # ...

由于注释完全被语法忽略，所以它们如何缩进并不重要。

如果您必须使用 """ ... """ 三引号字符串作为 'block comments'，您必须将它们缩进以成为它们所在的 if 或 elif 块的一部分:

""" Toxic """
if num >= -25 and num < -10:
    # ...
    """ Mildly poisonous """
elif num >= -10 and num < 0:
    # ...
    """ Healthy """
else:
    # ...

Python 中 elif 语句的语法错误

Syntax Error on elif statement in Python

python

if-statement

syntax-error

python-2.7