March 2022
Intermediate to advanced
522 pages
13h 52m
Chinese
Content preview from Python语言及其应用（第2版）
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if
语句
｜
43
或者和代码出现在同一行：
>>> seconds_per_day = 86400 # 60秒/分钟 * 60分钟/小时 * 24小时/天
\#
字符有很多种叫法：
hash
、
sharp
、
pound
，或是听起来挺凶险的
octothorpe
。
1
随便你怎
么称呼，
2
其效果只能持续到所在行的行尾。
Python
没有多行注释。你需要明确地在每一行注释前加上
#
：
>>> # I can say anything here, even if Python doesn't like it,
... # because I'm protected by the awesome
... # octothorpe.
...
>>>
但如果
#
出现在字符串中，威猛的
octothorpe
就会又重新扮演起它原本的角色，作为一个
古老而普通的
#
字符。
>>> print("No comment: quotes make the # harmless.")
No comment: quotes make the # harmless.
4.2
使用
\
续行
代码行的长度保持在合理程度内能够提高程序的可读性。推荐的（并非强制要求）行最大
长度是
80
个字符
。如果这个长度还不够，可以使用
续行字符
\
（反斜线）。只需把
\
放在
行尾，
Python
就会认为后续内容仍在同一行。
假如我想累加前
5
个数，那么可以一次写一行：
>>> sum = 0
>>> sum += 1
>>> sum += 2
>>> sum += 3
>>> sum += ...
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