iter(object[, sentinel]):返回一个迭代对象,对象需要支持__iter__() 、__getitem__() 、__next__() 。 len(s):返回一个对象的长度。 list([iterable]):返回一个可变数组类型。 locals():它们提供了基于字典的访问局部变量的方式。 map(function, iterable, ...):将函数对象依次作用于表的每一个元素。
3. eval()仅支持有效的表达式求值并返回计算结果 2.21 filter(function, iterable): 类似表达式的过滤。比列表推导式省内存 1. 如果function不是None,等效于生成器表达式,比列表推导式省内存 2. 如果function是None,等效于列表推导式 f = filter(None,shares) # 函数为None,类似列表推导式,循环打印出每一个值 p...
bin() oct() hex() 3、简单数据类型 - 整数:int() - 浮点数:float() - 字符\字符串:str() repr() ascii() ord() chr() format() - 字节:bytes() bytearray() - 布尔:bool() - 复数:complex() 4、数据结构 - 列表:list() slice() range() - 元组:tuple() - 字典:dict() hash() - ...
Python has a set of built-in functions. FunctionDescription abs()Returns the absolute value of a number all()Returns True if all items in an iterable object are true any()Returns True if any item in an iterable object is true ascii()Returns a readable version of an object. Replaces none...
- 字典:dict() hash() - 集合:set() frozenset() - 方法:len() zip() all() any() iter() filter() next() sorted() reversed() enumerate() map() memoryview() 5、面向对象 setattr() getattr() delattr() hasattr() super() property() ...
hash() The hash() function returns the hash value of the object (if it has one). help() The help() function is used to execute the built-in help system. hex() The hex() function converts an integer number to a lowercase hexadecimal string prefixed with "0x". id() The id() fun...
PythonBuilt-inFunction学习笔记 PythonBuilt-inFunction学习笔记1. 匿名函数 1.1 什么是匿名函数 python允许使⽤lambda来创建⼀个匿名函数，匿名是因为他不需要以标准的⽅式来声明，⽐如def语句 1.2 匿名函数优点 节省内存：如果不把它赋值给⼀个变量的话，由于是匿名的，不⽤分配栈空间 不会重名 可以嵌...
Function Function hll_in Receives hll data in string format. hll_out Sends hll data in string format. hll_recv Receives hll data in bytea format. hll_send Sends hll data in bytea format. hll_trans_in Receives hll_trans_type data in string format. hll_trans_out Sends hll_trans_type da...
function_exported/3 garbage_collect/0 garbage_collect/1 get/0 get/1 get_cookie/0 get_keys/1 get_module_info/2 get_stacktrace/0 group_leader/0 group_leader/2 hd/1 insert_element/3 integer_to_binary/1 integer_to_binary/2 integer_to_list/1 ...
Background The Go runtime contains an efficient hash function that it uses to implement built-in maps. The runtime hash function is capable of hashing arbitrary comparable values, and usually cannot be pruned away during linking: for exa...