如何提高Python代码中段落的可读性

Question

我经常需要把一段段文字展示给用户。我对如何把文字呈现给用户还算满意（通常是用\n或者换行来让用户看起来更舒服），但我想知道有没有办法在我的代码里实现换行，而不使用\n。

a = "this is a really long line of text that i need to show to the user. this is a really long line of text that i need to show to the user. this is a really long line of text that i need to show to the user. this is a really long line of text that i need to show to the user."

b = "this is a really long line of text that i need to show to the user.\n
this is a really long line of text that i need to show to the user.\n
this is a really long line of text that i need to show to the user.\n"

所以我的目标是把'a'分成看起来更好看的小块，在代码里这样做，但在展示给用户时仍然使用自动换行。我知道的唯一方法在'b'里展示了，但那样做不支持自动换行。

Answer 1

你可以使用三重引号来写一个“heredoc”：

b = 
'''
this is a really long line of text that i need to show to the user.
this is a really long line of text that i need to show to the user.
this is a really long line of text that i need to show to the user.
'''

Answer 2

把字符串放在括号里，然后利用Python会自动把相邻的字符串连接起来的特点。这样你就可以在代码中随意添加空格或格式了。

b = ("this is a really long line of text that i need to show to the user."
     "this is a really long line of text that i need to show to the user."
     "this is a really long line of text that i need to show to the user.")

Answer 3

你可以使用三重引号，比如：

b = """this is a really long line of text that i need to show to the user.
this is a really long line of text that i need to show to the user.
this is a really long line of text that i need to show to the user."""
# no \n needed, but carriage returns happen on every newline

或者你可以使用自动拼接字符串的方式

# THIS DOESN'T WORK
b = "this is a really long line of text that i need to show to the user."
    "this is a really long line of text that i need to show to the user."
    "this is a really long line of text that i need to show to the user."
# also no \n needed, but this is one long line of text.

哎呀，Roger Fan 的精彩回答下的评论提醒我，如果不把它放在括号里或者使用换行符 \，是不能这样做的。

b = ("this is a really long line of text that i need to show to the user."
     "this is a really long line of text that i need to show to the user."
     "this is a really long line of text that i need to show to the user.")
# OR
b = "this is a really long line of text that i need to show to the user."\
    "this is a really long line of text that i need to show to the user."\
    "this is a really long line of text that i need to show to the user."

Answer 4

你想让代码更易读吗？在Python中，紧挨着的字符串会自动连接在一起。如果你想让字符串跨越多行，可以使用换行符\，或者更好的是，把它放在括号里。

a = ("This is a really long\n"
     "line of text that I\n"
     "need to show to the user.")

print(a)