print("What\'s your name ?") print('Do you know \"Python\" ?') 执行以上代码,输出结果为: What's your name ? Do you know "Python" ? 13.2 转义字符 由反斜杠加上一个字符或数字组成,它把反斜杠后面的字符或数字转换成特定的意义。简单来说就是字符要转成其他含义的的功能,所以我们叫它 “转...
Q3. What is the difference between using the Pop Function and the Del statement in Python? Ans.The Pop function and the Del statement both remove elements from a list or dictionary. However, the Pop function also returns the removed element or value, while the Del statement does not. Additi...
what: 注释就是对代码的解释说明,注释部分不会被当做代码执行 why: 增强代码的可读性(模仿人的解释说明的能力),可以注释掉不想运行的代码 how: 注释分为单行注释和多行注释 单行注释用#,可写在代码正上方或者正后方 多行注释用三对双引号或单引号,分别放在代码正上方和正下方(多行注释一般只在代码开头写一次)...
1,索引切片 与字符串一样 2,增删改查,以及其他操作 增 append 追加 insert 列表.insert(索引,元素) extend 列表.extend(['元素','元素']) 删 pop 按照索引删除 列表.pop(索引), 会返回删除内容 remove 按照元素删除 列表.remove('元素') clear 清空列表 列表.clear() del 按照索引,切片删除 索引:del 列...
print('What is your ? It is .'.format(q, a)) 要反向遍历一个序列,首先指定这个序列,然后调用 reversed() 函数: for i in reversed(range(1, 10, 2)): print(i) 要按顺序遍历一个序列,使用 sorted() 函数返回一个已排序的序列,并不修改原值: ...
what's the 是模块? 一个模块就是一个包含了python定义和声明的文件,文件名就是模块名字加上.py的后缀。 但其实import加载的模块分为四个通用类别: 1 使用python编写的代码(.py文件) 2 已被编译为共享库或DLL的C或C++扩展 3 包好一组模块的包
If I try adding, let’s say, number 2, which I already have in my set,and then I ask what other members of the set now,you’ll see that nothing has happened. 这是set的关键特性之一。 And this is one of the key features of set. 换句话说,如果集合中已有一个对象,并且再次尝试添加该...
What's defaultdict ? collections — Container datatypes — Python 3.8.5 documentation https://docs.python.org/3/library/collections.html?highlight=defaultdict#collections.defaultdict class collections.defaultdict([default_factory[, ...]]) Returns a new dictionary-like object. defaultdict is a subclass...
>>> import keyword>>> keyword.kwlist ['False','None','True','and','as','assert','break','class','continue','def','del','elif','else','except','finally','for','from','global','if','import','in','is','lambda','nonlocal','not','or','pass','raise','return','try'...
If you're an experienced Python programmer, you'll successfully anticipate what's going to happen next most of the time. Read the output snippets and, Check if the outputs are the same as you'd expect. Make sure if you know the exact reason behind the output being the way it is. ...