"""Adds two numbers.""" return a + b print(add.__name__) # 输出:"add" print(add.__doc__) # 输出:"Adds two numbers." 在这个例子中,使用functools.wraps(original_function)装饰wrapper函数,确保了原函数add的元信息得到保留。 3.2 无参装饰器的编写与实践 3.2.1 实现常见的功能增强装饰器3.2....
Let’s think about a simple example where we have a set of numbers contained in a list,and we would like to pick one of those numbers uniformly at random. 在本例中,我们需要使用的函数是random.choice,在括号内,我们需要一个列表。 The function we need to use in this case is random.choice...
ax.hist(dist) ax.set_title("Histogram of random numbers") ax.set_xlabel("Value") ax.set_ylabel("Density") 生成的图表显示在图 4.1中。正如我们所看到的,数据大致均匀地分布在整个范围内: 图4.1:在 0 和 1 之间生成的随机数的直方图 它是如何工作的... Generator接口提供了三种简单的方法来生成基本...
你可以用方括号定义,或用list函数: a_list=[1,23,55,None]a_tup=(1,2,34,5,None)a_tup(1,2,34,5,None)a_list_tup=list(a_tup)a_list_tup[1,2,34,5,None]a_list[1]23 列表和元组的语义接近,在许多函数中可以交叉使用。 list函数常用来在数据处理中实体化迭代器或生成器: gen=range(10)ge...
如果x<y,返回值是负的(-1),如果x==y,返回0,如果 x > y,返回一个正数(1).6abs(x) 返回一个数的绝对值7bool() 布尔值8divmod( a, b) 取商和余数9max() 取最大值10min() 最小值11sum() 求和 sum([1,2,4])12pow() 幂子方 pow(2,4) 2的四字方13len() 求字符串长度.14all() 全...
Add a comment 246 Once you've imported the module, you can just do: help(modulename) ... To get the docs on all the functions at once, interactively. Or you can use: dir(modulename) ... To simply list the names of all the functions and variables defined in the module. Shar...
1. >>> import turtle as t2. >>> t.Turtle()3. >>> for i in range(4):4. t.forward(100)5. t.left(90) 循环出多个正方形 >>> import turtle as t>>> def rect(n):for i in range(4):t.forward(n)t.left(90)>>> t.Turtle()<turtle.Turtle object at 0x0000000002C6A340>>> ...
Everything you’ve learned so far about lists and tuples can help you decide when to use a list or a tuple in your code. Here’s a summary of when it would be appropriate to use a list instead of a tuple: Mutable collections: When you need to add, remove, or change elements in ...
numbers=[1,2,3,4,5]squared_numbers=[num*numfornuminnumbers]print(squared_numbers)# [1, 4, 9, 16, 25] 推导式不仅列表能用,字典、集合、生成器也能使用。下面看一下,使用字典推导式,将字典的值提高一倍。 dictionary={'a':4,'b':5}squared_dictionary={key:num*numfor(key,num)indictionary....
print(abs('a')) 报错: 代码语言:javascript 代码运行次数:0 复制 Cloud Studio代码运行 Traceback(most recent call last):File"E:/ML/PycharmProjects/HelloWorld/app.py",line11,in<module>print(abs('a'))TypeError:bad operand typeforabs():'str' ...