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
<A instance at 796960> INSTANCE
<B instance at 796990> 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.
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