Python del is keyword in Python programming language. del is used to delete object in Python. Below we will study about del keyword.
Syntax of Python del
del object_name
- object_name is that object which need to be deleted.
- object_name could be String, list, tuple, set, dictionary, class object etc.
Let’s understand Python del by taking few examples:
Delete a variable
[code language=”python”]
Python del Example
age =10
print(“age is:”,age)
del age
print(“age is:”,age)
[/code]
age is: 10
print("age is:",age)
NameError: name 'age' is not defined
- age is variable
- when we print age value it is 10.
- When we apply del keyword on age, its deleted and when we try to print the value of age again, it throws error that
NameError: name 'age' is not defined.
Delete a String
[code language=”python”]
#Python del Example
name=”learn Python”;
print(“name is:”,name)
del name
print(“variable is:”,name)
[/code]
name is: learn Python
print("variable is:",name)
NameError: name 'name' is not defined
Python del with a list
del can be used to delete Python list.
[code language=”python”]
#Python list del Example
name =[“Chandler”,”Joey”,”Ross”]
print(type(name))
print(“name is:”,name)
del name
print(“variable is:”,name)
[/code]
<class 'list'>
name is: ['Chandler', 'Joey', 'Ross']
print("variable is:",name)
NameError: name 'name' is not defined
Python del with a tuple
Let’s see how we can use del keyword with Python tuple.
[code language=”python”]
#Python tuple del Example
name =(“Chandler”,”Joey”,”Ross”)
print(type(name))
print(“name is:”,name)
del name
print(“variable is:”,name)
[/code]
<class 'tuple'>
name is: ('Chandler', 'Joey', 'Ross')
print("variable is:",name)
NameError: name 'name' is not defined
del with set
[code language=”python”]
#Python set del Example
name ={“Chandler”,”Joey”,”Ross”}
print(type(name))
print(“name is:”,name)
del name
print(“variable is:”,name)
[/code]
<class 'set'>
name is: {'Chandler', 'Joey', 'Ross'}
print("variable is:",name)
NameError: name 'name' is not defined
delete a dictionary
[code language=”python”]
#del with Python dictionary Example
dict1 ={“0″:”zero”,
“1”:”one”,
“2”:”two”}
print(type(dict1))
print(“name is:”,dict1)
del dict1
print(“dict is:”,dict1)
[/code]
<class 'dict'>
name is: {'0': 'zero', '1': 'one', '2': 'two'}
NameError: name 'dict1' is not defined
delete a function
[code language=”python”]
#del with Python function Example
def test() :
return “hi”
print(test())
del test
print(test())
[/code]
hi NameError: name 'test' is not defined
del with class object
[code language=”python”]
#del with Python class Example
class Test :
def name(name) :
return name
print(Test.name(“hello”))
del Test
print(Test.name(“hello”))
[/code]
hello NameError: name 'Test' is not defined