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',...
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 ...
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...
importstring# load doc into memorydefload_doc(filename):# open the file as read onlyfile = open(filename,'r')# read all texttext = file.read()# close the filefile.close()returntext# extract descriptions for imagesdefload_descriptions(doc):mapping = dict()# process linesforlineindoc.sp...
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 ...
In the first example,{precision}inside{value:.{precision}f}demonstrates how an inner f-string expression can define a format specifier for an outer one. The second example shows an f-string used within a conditional expression inside the main f-string. ...
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 ...
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 agai...
Because Python doesn't provide a way to create multiline comments, developers often just use three quotation marks for this purpose. In a Jupyter notebook, however, such quotation marks define a string literal that appears as the output of a code cell: ...
For example, we can provide the starting point,and we can also define the step size. 所以如果我们输入“range1到6”,在这种情况下,我们得到一个range对象,它从1开始,到5结束。 So if we type "range 1 to 6," in that case,we get a range object which starts at 1 and ends at 5. 如果我...