setattr getattr hasattr 1. abs() returns absolute value of a number 返回绝对值 2. all() returns true when all elements in iterable is true 都为true则为true 3.
同样builtin_methods是一个PyMethodDef数组,以空PyMethodDef结尾。熟悉的print、dir等函数都可在这找到定义。 这类Moudle还有很多,如io模块也是这样实现的。在Modules\_io\_iomodule.c可找到对应的定义。 3.内存中的builtin_function_or_method Python提供了一个叫id的函数,该函数可以查看对应对象在内存中的地址。
Python has a set of built-in methods that you can use on strings.Note: All string methods returns new values. They do not change the original string.MethodDescription capitalize() Converts the first character to upper case casefold() Converts string into lower case center() Returns a ...
在类的内部调用self.__private_methods 3)实例 代码语言:javascript 复制 class JustCounter: __secretCount = 0 # 私有变量 publicCount = 0 # 公开变量 def count(self): self.__secretCount += 1 self.publicCount += 1 print(self.__secretCount) # 在内部使用私有化属性,不会产生错误 counter = ...
dir()Returns a list of the specified object's properties and methods divmod()Returns the quotient and the remainder when argument1 is divided by argument2 enumerate()Takes a collection (e.g. a tuple) and returns it as an enumerate object ...
The bytearray class is a mutable sequence of integers in the range 0 <= x < 256. # It has most of the usual methods of mutable sequences, described in Mutable Sequence Types, # as well as most methods that the bytes type has, see Bytes and Bytearray Operations. # Without an ...
2.4. 内建函数和方法(built-in functions and methods) 根据定义,内建的(built-in)模块是指使用C写的模块,可以通过sys模块的builtin_module_names字段查看都有哪些模块是内建的。这些模块中的函数和方法可以使用的属性比较少,不过一般也不需要在代码中查看它们的信息。
Objects/object.c for the built-in methods Objects/boolobject.c for the bool type Objects/bytearrayobject.c for the byte[] type Objects/bytesobjects.c for the bytes type Objects/cellobject.c for the cell type Objects/classobject.c for the abstract class type, used in meta-programming Object...
Python 里面万物皆对象(object),整型也不例外,只要是对象,就有相应的属性 (attributes) 和方法(methods)。 【例子】 [17]: b = dir(int) print(b) # ['__abs__', '__add__', '__and__', '__bool__', '__ceil__', '__class__', # '__delattr__', '__dir__', '__divmod__'...