Question

print ("You have two choices:", \n "(1) Get up now", \n "or," \n "(2) Sleep some more and wait till morning")

我真的不明白这段代码有什么问题。当我运行它时，Python说“行后续字符有一个意想不到的字符”，我不明白。

Answer 1

将换行符放在双引号内。

In [44]: print("You have two choices:",  "\n(1) Get up now",  "\nor,"  "\n(2) Sleep some more and wait till morning")
You have two choices: 
(1) Get up now 
or,
(2) Sleep some more and wait till morning

Answer 2

首先，要解决您的问题，请注意换行符\n应该在里面引号，即字符串文字本身的一部分：

print ("You have two choices:\n(1) Get up now\nor\n(2) Sleep some more and wait till morning")

其次，错误消息的原因是反斜杠\ 外部引号用于表示＆＃34;此逻辑行继续在下一个物理行上＆＃ 34; ，即explicit line joining。这意味着例如：

if some_really_long_predicate and \
        this_other_thing:
    print("We're here now")

是可以接受的，虽然在括号is preferred中隐式延续：

if (some_really_long_predicate and
        this_other_thing):
    print("We're here now")

因此当Python解析时：

print ("You have two choices:", \n ...
                              # ^ continuation character

它不期望找到n（＆＃34;意外字符＆＃34; 有问题）或任何后续字符。

最后，请注意您可以使用多行字符串将其写得更整齐：

print("""You have two choices:
(1) Get up now
or
(2) Sleep some more and wait till morning""")
                                       # ^ note triple quotes

（参见here了解如何在缩进的块中制作这个整理器。）

这个python代码有什么问题

2 个答案: