Python3学习笔记3-try and except, comment, \(back-slash)

最新推荐文章于 2025-02-06 21:21:06 发布

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最新推荐文章于 2025-02-06 21:21:06 发布

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本文介绍了Python中处理异常的方法，使用try-except结构来捕获并处理导入模块失败的情况。此外，还讲解了如何使用注释、多行字符串以及转义字符等语法技巧，并展示了如何通过使用反斜杠进行代码换行。

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干货太多了，天哪

1.Try and except

>>> try:
    import flask
except:
    print("No mudule named flask")


No mudule named flask
>>>

2 Comments , Triple quotation marks,Back-salsh

2.1
用#注释。#之后的语句不会运行。

2.2

"""
Write anything you want.
Can span multiple lines.
""" 
"""
Or three single quotation marks '''    '''
"""

2.3
\ character is a way we can put difficult-to-type characters into a string.

Escape      What it does.
\\          Backslash (\)
\'          Single-quote (')
\"          Double-quote (")
\a          ASCII bell (BEL)
\b          ASCII backspace (BS)
\f          ASCII formfeed (FF)
\n          ASCII linefeed (LF)
\N{name}    Character named name in the Unicode database (Unicode only)
\r          Carriage Return (CR)
\t          Horizontal Tab (TAB)
\uxxxx      Character with 16-bit hex value xxxx (Unicode only)
\Uxxxxxxxx  Character with 32-bit hex value xxxxxxxx (Unicode only)
\v          ASCII vertical tab (VT)
\ooo        Character with octal value ooo
\xhh        Character with hex value hh
来自 <https://learnpythonthehardway.org/book/ex10.html>

一行代码太长的时候，可以用 \ 来换行。

>>> longitude = 118.06
>>> latitude = 24.27
>>> if 118.00000000 < longitude < 118.22222222\
   and 24.22222222 < latitude < 29.66666666 :
    print("Somewhere.")
else:
    print("Somewhere else.")


Somewhere.
>>>