源代码： Lib/types.py
This module defines names for some object types that are used by the standard Python interpreter, but not for the types defined by various extension modules. Also, it does not include some of the types that arise during processing such as the listiterator type. It is safe to use from 类型 import * — the module does not export any names besides the ones listed here. New names exported by future versions of this module will all end in Type .
Typical use is for functions that do different things depending on their argument types, like the following:
from types import * def delete(mylist, item): if type(item) is IntType: del mylist[item] else: mylist.remove(item)
Starting in Python 2.2, built-in factory functions such as int() and str() are also names for the corresponding types. This is now the preferred way to access the type instead of using the 类型 module. Accordingly, the example above should be written as follows:
def delete(mylist, item): if isinstance(item, int): del mylist[item] else: mylist.remove(item)
The module defines the following names:
类型对于 None .
The type of complex numbers (e.g. 1.0j ). This is not defined if Python was built without complex number support.
The type of Unicode character strings (e.g. u'Spam' ). This is not defined if Python was built without Unicode support. It’s an alias of the built-in unicode .
The type of dictionaries (e.g. {'Bacon': 1, 'Ham': 0} ); alias of the built-in dict .
An alternate name for DictType .
类型对于 generator -iterator objects, produced by calling a generator function.
2.2 版新增。
The type of user-defined old-style classes.
The type of instances of user-defined classes.
用户定义类实例方法的类型。
An alternate name for MethodType .
内置函数的类型像 len() or sys.exit() , and methods of built-in classes. (Here, the term “built-in” means “written in C”.)
The type of modules.
类型对于 Ellipsis .
The type of traceback objects such as found in sys.exc_traceback .
The type of frame objects such as found in tb.tb_frame if tb is a traceback object.
The type of dict proxies, such as TypeType.__dict__ .
类型对于 NotImplemented
The type of objects defined in extension modules with PyGetSetDef ，譬如 FrameType.f_locals or array.array.typecode . This type is used as descriptor for object attributes; it has the same purpose as the property type, but for classes defined in extension modules.
2.5 版新增。
The type of objects defined in extension modules with PyMemberDef ，譬如 datetime.timedelta.days . This type is used as descriptor for simple C data members which use standard conversion functions; it has the same purpose as the property type, but for classes defined in extension modules.
CPython 实现细节： In other implementations of Python, this type may be identical to GetSetDescriptorType .
2.5 版新增。
A sequence containing StringType and UnicodeType used to facilitate easier checking for any string object. Using this is more portable than using a sequence of the two string types constructed elsewhere since it only contains UnicodeType if it has been built in the running version of Python. For example: isinstance(s, types.StringTypes) .
2.2 版新增。
