Python has a built-in function called type() that helps you find the class type of the variable given as input. For example, if the input is a ...
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Whatistype()inPython?
Pythonhasabuilt-infunctioncalledtype()thathelpsyoufindtheclasstypeofthevariablegivenasinput.Forexample,iftheinputisastring,youwillgettheoutputas,forthelist,itwillbe,etc.
Usingtype()command,youcanpassasingleargument,andthereturnvaluewillbetheclasstypeoftheargumentgiven,example:type(object).
Itisalsopossibletopassthreeargumentstotype(),i.e.,type(name,bases,dict),insuchcase,itwillreturnyouanewtypeobject.
Inthistutorial,youwilllearn:
Whatistype()inPython?
Syntaxfortype():
Exampleoftype()
Example:Usingtype()forclassobject.
Example:Usingthename,bases,anddictintype()
Whatisisinstance()inPython?
Syntaxisinstance():
Examplesofisinstance()
DifferenceBetweentype()andisinstance()inPython
Syntaxfortype():
type()canbeusedintwowaysasshownbelow:
type(object)
type(namr,bases,dict)
Parameters:type(object)
object:Thisisamandatoryparameter.Ifthisisonlyparameterpassedtotype(),thanitwillreturnyouthetypeoftheparameter.
Parameters:type(name,bases,dict)
name:nameoftheclass.
bases:(optional).Thisisanoptionalparameter,anditisthebaseclass
dict:(optional).Thisisanoptionalparameter,anditisanamespacethathasthedefinitionoftheclass.
ReturnValue:
Iftheobjectistheonlyparameterpassedtotype()thenitwillreturnyouthetypeoftheobject.
Iftheparamspassedtotypeisatype(object,bases,dict),insuchcase,itwillreturnanewtypeofobject.
Exampleoftype()
Inthis,examplewehaveastringvalue,number,floatvalue,acomplexnumber,list,tuple,dictandset.Wewillusethevariableswithtypetoseetheoutputforeachofthem.
str_list="WelcometoGuru99"
age=50
pi=3.14
c_num=3j+10
my_list=["A","B","C","D"]
my_tuple=("A","B","C","D")
my_dict={"A":"a","B":"b","C":"c","D":"d"}
my_set={'A','B','C','D'}
print("Thetypeis:",type(str_list))
print("Thetypeis:",type(age))
print("Thetypeis:",type(pi))
print("Thetypeis:",type(c_num))
print("Thetypeis:",type(my_list))
print("Thetypeis:",type(my_tuple))
print("Thetypeis:",type(my_dict))
print("Thetypeis:",type(my_set))
Output:
Thetypeis:
Thetypeis:
Thetypeis:
Thetypeis:
Thetypeis:
Thetypeis:
Thetypeis:
Thetypeis:
Example:Usingtype()forclassobject.
Whenyouchecktheobjectcreatedfromaclassusingtype(),itreturnstheclasstypealongwiththenameoftheclass.Inthisexample,wewillcreateaclassandchecktheobjecttypecreatedfromtheclasstest.
classtest:
s='testing'
t=test()
print(type(t))
Output:
Example:Usingthename,bases,anddictintype()
Thetypecanbealsocalledusingthesyntax:type(name,bases,dict).
Thethreeparameterspassedtotype()i.e.,name,basesanddictarethecomponentsthatmakeupaclassdefinition.Thenamerepresentstheclassname,thebasesisthebaseclass,anddictisthedictionaryofbaseclassattributes.
Inthisexample,wearegoingtomakeuseofallthreeparamsi.ename,bases,anddictintype().
Example:
classMyClass:
x='HelloWorld'
y=50
t1=type('NewClass',(MyClass,),dict(x='HelloWorld',y=50))
print(type(t1))
print(vars(t1))
Output:
{'x':'HelloWorld','y':50,'__module__':'__main__','__doc__':None}
Whenyoupassallthreeargumentstotype(),ithelpsyoutoinitializenewclasswithbaseclassattributes.
Whatisisinstance()inPython?
Pythonisinstanceispartofpythonbuilt-infunctions.Pythonisinstance()takesintwoarguments,anditreturnstrueifthefirstargumentisaninstanceoftheclassinfogivenasthesecondargument.
Syntaxisinstance()
isinstance(object,classtype)
Parameters
object:Anobjectwhoseinstanceyouarecomparingwithclasstype.Itwillreturntrueifthetypematchesotherwisefalse.
classtype:Atypeoraclassoratupleoftypesand/orclasses.
Returnvalue:
Itwillreturntrueiftheobjectisaninstanceofclasstypeandfalseifnot.
Examplesofisinstance()
Inthissection,wewillstudyvariousexamplestolearnisinstance()
Example:isinstance()Integercheck
Thecodebelowcomparesintegervalue51withtypeint.Itwillreturntrueitthetypeof51matcheswithintotherwisefalse.
age=isinstance(51,int)
print("ageisaninteger:",age)
Output:
ageisaninteger:True
Example:isinstance()Floatcheck
Inthisexamplewearegoingtocomparethefloatvaluewithtypefloati.e.3.14valuewillbecomparewithtypefloat.
pi=isinstance(3.14,float)
print("piisafloat:",pi)
Output:
piisafloat:True
Example:isinstance()Stringcheck
message=isinstance("HelloWorld",str)
print("messageisastring:",message)
Output:
messageisastring:True
Example:isinstance()Tuplecheck
Thecodechecksforatuple(1,2,3,4,5)withtypetuple.Itwillreturntrueiftheinputgivenisoftypetupleandfalseifnot.
my_tuple=isinstance((1,2,3,4,5),tuple)
print("my_tupleisatuple:",my_tuple)
Output:
my_tupleisatuple:True
Example:isinstance()Setcheck
Thecodechecksforaset({1,2,3,4,5},withtypeset.Itwillreturntrueiftheinputgivenisoftypesetandfalseifnot.
my_set=isinstance({1,2,3,4,5},set)
print("my_setisaset:",my_set)
Output:
my_setisaset:True
Example:isinstance()listcheck
Thecodechecksforalist[1,2,3,4,5],withtypelist.Itwillreturntrueiftheinputgivenisoftypelistandfalseifnot.
my_list=isinstance([1,2,3,4,5],list)
print("my_listisalist:",my_list)
Output:
my_listisalist:True
Example:isinstance()dictcheck
Thecodechecksforadict({“A”:”a”,“B”:”b”,“C”:”c”,“D”:”d”},withtypedict.Itwillreturntrueiftheinputgivenisoftypedictandfalseifnot.
my_dict=isinstance({"A":"a","B":"b","C":"c","D":"d"},dict)
print("my_dictisadict:",my_dict)
Output:
my_dictisadict:True
Example:isinstance()testonaclass
Thecodeshowsthetypecheckofclasswithisinstance().Theobjectoftheclassiscomparedwiththenameoftheclassinsideisinstance().Itreturnstrueiftheobjectbelongstotheclassandfalseotherwise.
classMyClass:
_message="HelloWorld"
_class=MyClass()
print("_classisainstanceofMyClass():",isinstance(_class,MyClass))
Output:
_classisainstanceofMyClass()True
DifferenceBetweentype()andisinstance()inPython
type()
isinstance()
Pythonhasabuilt-infunctioncalledtype()thathelpsyoufindtheclasstypeofthevariablegivenasinput.
Pythonhasabuilt-infunctioncalledisinstance()thatcomparesthevaluewiththetypegiven.Ifthevalueandtypegivenmatchesitwillreturntrueotherwisefalse.
Thereturnvalueisatypeobject
ThereturnvalueisaBooleani.etrueorfalse.
classA:
my_listA=[1,2,3]
classB(A):
my_listB=[1,2,3]
print(type(A())==A)
print(type(B())==A)
Output:
True
False
Incaseoftypethesubclasscheckgivesbackfalse.
classA:
my_listA=[1,2,3]
classB(A):
my_listB=[1,2,3]
print(isinstance(A(),A))
print(isinstance(B(),A))
Output:
True
True
isinstance()givesatruthyvaluewhencheckedwithasubclass.
Summary:
Pythonhasabuilt-infunctioncalledtype()thathelpsyoufindtheclasstypeofthevariablegivenasinput.Forexample,iftheinputisastring,youwillgettheoutputas,forthelist,itwillbe,etc.
Fortype(),youcanpassasingleargument,andthereturnvaluewillbetheclasstypeoftheargumentgiven,e.g.,type(object).
Itisalsopossibletopassthreeargumentstotype(),i.e.,type(name,bases,dict),insuchcase,itwillreturnyouanewtypeobject.
Pythonhasabuilt-infunctioncalledinstance()thatcomparesthevaluewiththetypegiven.Itthevalueandtypegivenmatchesitwillreturntrueotherwisefalse.Usingisinstance(),youcantestforstring,float,int,list,tuple,dict,set,class,etc.
Usingisinstance()method,youcantestforstring,float,int,list,tuple,dict,set,class,etc.
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