这里还有一些例子: >>># 3 into integer myint>>>myint =3>>># a string of characters into a string variable>>>text ='Some text'>>># a floating point number>>>cost =3*123.45>>># a longer string>>>Name ='Mr'+' '+'Fred'+' '+'Bloggs'>>># a list>>>shoppingList = ['ham',...
All Python objects have two possible string representations: the user-readable representation (str) and the human-readable representation (repr). The representation for str defaults to the same representation as repr, so in general most objects only define one of these two string representations: rep...
In the first set of examples, you define two variables, a and b, to run a few comparisons between them. The value of a is less than the value of b. So, every comparison expression returns the expected Boolean value. The second set of examples uses two values that are equal, and ...
There is one additional way to define strings in Python, using triple-single-quotes (''') or triple-double-quotes ("""). This method of creating strings allows the strings to be defined across multiple lines with the newline characters retained. You can see an example of this in the ...
For example, we might want to implement a simple random sampling process. 为此,我们可以使用随机模块。 To this end, we can use the random module. 所以,我们的出发点是,再次导入这个模块,random。 So the starting point is, again, to import that module, random. 让我们考虑一个简单的例子,其中列表...
Logging provides a lot more information compared toprint()statements. For example, a log message tells you where the log message was generated, the error line, and the time the message was generated. You will need several lines of code to define basic logging using the print statements. ...
Many processes in nature involve randomness in one form or another. 自然界中的许多过程都以这样或那样的形式涉及随机性。 Whether we investigate the motions of microscopic molecules or study the popularity of electoral candidates,we see randomness, or at least apparent randomness, almost everywhere. 无...
It has a single parameter, myname, and its body is the block of code immediately following the line beginning with def (short for define). A parameter is a variable that exists only while a function is being used. You can run the function by calling its name, using parentheses around ...
Define environment variablePYENV_ROOTto point to the path where Pyenv will store its data.$HOME/.pyenvis the default. If you installed Pyenv via Git checkout, we recommend to set it to the same location as where you cloned it. Add thepyenvexecutable to yourPATHif it's not already there...
解释型语言:解释型语言编写的程序不进行预先编译,以文本方式存储程序代码,会将代码一句一句直接运行。在发布程序时,看起来省了道编译工序,但是在运行程序的时候,必须先解释再运行 编译型语言和解释型语言对比 速度——编译型语言比解释型语言执行速度快 跨平台性—— 解释型语言比编译型语言跨平台性好 ...