x = first_choice if first_choice else second_choice 这实际上是Python内置的三元运算符糖衣语法 ,但使用and与or直接实现同样效果也颇具魅力: x = first_choice or second_choice 此表达式利用了or的短路特性,如果first_choice是“真”值 ,则直接返回它,否则继续评估并返回second_choice。 or运算符经常被用作设...
or file_type in [FILE_TYPE_SOFTWARE, FILE_TYPE_CFG, FILE_TYPE_LIC, FILE_TYPE_USER] or \ (file_type in [FILE_TYPE_PAT, FILE_TYPE_MOD, FILE_TYPE_FEATURE_PLUGIN] and effective_mode == EFFECTIVE_MODE_NO_NEED): file_info_list[i].update({ '*EFFECTIVE_MODE': FILE_DEFAULT_EFFECTIVE_...
encoding="utf-8") # 读取文件的第一行内容 first = f.readline() print(f"获取的第一行的数据...
Python2.7.5(default,Nov202015,02:00:19)[GCC4.8.520150623(Red Hat4.8.5-4)]on linux2 Type"help","copyright","credits"or"license"formore information.>>>importMySQLdb>>> 先简单看看API,再看后面的案例 连接和游标 为了使用基础数据库系统,首先必须连接到它。这个时候需要使用具有恰当名称的connect函数,...
(This will fail if youalsobuilt at the top-level directory. You should do amake cleanat the top-level first.) To get an optimized build of Python,configure --enable-optimizationsbefore you runmake. This sets the default make targets up to enable Profile Guided Optimization (PGO) and may ...
Prints the values to a stream, or to sys.stdout by default. Optional keyword arguments: file: a file-like object (stream); defaults to the current sys.stdout. sep: string inserted between values, default a space. end: string appended after the last value, default a newline. ...
利用三引号,你可以指示一个多行的字符串。你可以在三引号中自由的使用单引号和双 引号。例如: '''This is a multi-line string. This is the first line. This is the second line. "What's your name?," I asked. He said "Bond, James Bond." ''' ...
s = templ.format( first=self.first_name, last=self.last_name, age=self.age, ) print(s) ... 完整代码可以查看官方文档[4],效果如下: Mimesis Star:2.9k Mimesis是一款用于mock数据的Python工具。 系统开发往往是和数据不同步的,因此,在开发过程中就需要开发人员去造一批数据,但是,有一些数据并不是像...
Thenuitka-runcommand is the same asnuitka, but with a different default. It tries to compileanddirectly execute a Python script: nuitka-run --help This option that is different is--run, and passing on arguments after the first non-option to the created binary, so it is somewhat more simil...
Move an existingkeyto either end of an ordered dictionary. The item is moved to the right end iflastis true (the default) or to the beginning iflastis false. RaisesKeyErrorif thekeydoes not exist: >>> >>>d=OrderedDict.fromkeys('abcde')>>>d.move_to_end('b')>>>''.join(d.keys(...