The types Module

Table of contents:

The types module contains type objects for all object types defined by the standard interpreter, as Example 1-86 demonstrates. All objects of the same type share a single type object. You can use is to test if an object has a given type.

Example 1-86. Using the types Module

File: types-example-1.py

import types

def check(object):
 print object,

 if type(object) is types.IntType:
 print "INTEGER",
 if type(object) is types.FloatType:
 print "FLOAT",
 if type(object) is types.StringType:
 print "STRING",
 if type(object) is types.ClassType:
 print "CLASS",
 if type(object) is types.InstanceType:
 print "INSTANCE",
 print

check(0)
check(0.0)
check("0")

class A:
 pass

class B:
 pass

check(A)
check(B)

a = A()
b = B()

check(a)
check(b)

0 INTEGER
0.0 FLOAT
0 STRING
A CLASS
B CLASS
 INSTANCE
 INSTANCE

Note that all classes have the same type, as do all instances. To test what class hierarchy a class or an instance belongs to, use the built-in issubclass and isinstance functions.

The types module destroys the current exception state when it is first imported. In other words, don't import it (or any module that imports it!) from within an exception handler.

1 17 The gc Module

Core Modules

More Standard Modules

Threads and Processes

Data Representation

File Formats

Mail and News Message Processing

Network Protocols

Internationalization

Multimedia Modules

Data Storage

Tools and Utilities

Platform-Specific Modules

Implementation Support Modules

Other Modules



Python Standard Library
Python Standard Library (Nutshell Handbooks) with
ISBN: 0596000960
EAN: 2147483647
Year: 2000
Pages: 252
Authors: Fredrik Lundh

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