docsting , 不推荐使用三个单引号 (''') # 模块的 docsting 放在文件头部,版权信息之后 ”””This is a one line docstring.””” ”””The title of a multiline docstring: After title is the content.You can write it as long as needed.
comparison ::= or_expr (comp_operator or_expr)* comp_operator ::= "<" | ">" | "==" | ">=" | "<=" | "!=" | "is" ["not"] | ["not"] "in" 比较运算将输出布尔值: True 或False。 比较运算可以任意串连,例如 x < y <= z 等价于 x < y and y <= z,除了 y 只被...
不可变类型 frozenset 这个 frozenset 类型不可变且hashable ---其内容创建后不能更改,因此可以用作字典键或其他集合的元素。 创建方式 注意:集合内部的元素必须是 hashable 在大括号内使用逗号分隔的元素列表: {'jack', 'sjoerd'} 使用一种固定的理解: {c for c in 'abracadabra' if c not in 'abc'} 使用...
Here's a fun project attempting to explain what exactly is happening under the hood for some counter-intuitive snippets and lesser-known features in Python.While some of the examples you see below may not be WTFs in the truest sense, but they'll reveal some of the interesting parts of ...
An object is hashable if it has a hash value that does not change during its entire lifetime. Python has a built-in hash method ( __hash__() ) that can be compared to other objects. For comparing it needs __eq__() or __cmp__() method and if the hashable objects are equal ...
string.lower方法能将字符串中的所有字母字符转换为小写,而upper方法则进行相反的转换。capitalize方法会把字符串的首字符转为大写字母,title方法则会把字符串中所有单词的首字符转换为大写字母。swapcase方法将字符串中的小写字母转换为大写,同时把大写字母转换为小写。expandtabs方法用指定数量的空格替换所有制表符,以便...
不可变类型frozenset 这个 frozenset 类型不可变且 hashable---其内容创建后不能更改,因此可以用作字典键或其他集合的元素。 创建方式 注意:集合内部的元素必须是hashable 在大括号内使用逗号分隔的元素列表:{'jack', 'sjoerd'} 使用一种固定的理解:{c for c in 'abracadabra' if c not in 'abc'} ...
An enumeration is a set of symbolic names bound to unique, constant values. Within an enumeration, the values can be compared by identity, and the enumeration itself can be iterated over. (Source)Before this addition to the standard library, you could create something similar to an enumeration...
文章内容有点多,是自己学习cerberus的记录,原文,由于篇幅有限,源码的解析就没有了,源码不是很难,具有很高的参考价值。感谢rino nakasone的翻译支持. cerberus 代码语言:javascript 代码运行次数:0 运行 AI代码解释 CERBERUS,n.The watch-dogofHades,whose duty it was to guard the entrance;everybody,sooner or la...
For example, if the page you turn to is lower than the one you’re looking for, then that’s your new lower bound. Let’s say you were looking for a strawberry in a collection of fruits sorted in ascending order by size: On the first attempt, the element in the middle happens to ...