Adding and Appending
- append(): Used for appending and adding elements to List.It is used to add elements to the last position of List.
Syntax:
python - Sample - python code :
list.append (element)click below button to copy the code. By Python tutorial team
python - Sample - python code :
# Adds List Element as value of List.
List = ['Mathematics', 'chemistry', 1997, 2000]
List.append(20544)
print(List)click below button to copy the code. By Python tutorial team
python programming - Output :
['Mathematics', 'chemistry', 1997, 2000, 20544]
- insert(): Inserts an elements at specified position.
Syntax:
python - Sample - python code :
list.insert(<position, element)click below button to copy the code. By Python tutorial team
Note: Position mentioned should be within the range of List, as in this case between 0 and 4, elsewise would throw IndexError.
python - Sample - python code :
List = ['Mathematics', 'chemistry', 1997, 2000]
# Insert at index 2 value 10087
List.insert(2,10087)
print(List)click below button to copy the code. By Python tutorial team
python programming - Output :
['Mathematics', 'chemistry', 10087, 1997, 2000, 20544]- extend(): Adds contents to List2 to the end of List1.
Syntax:
python - Sample - python code :
List1.extend(List2)click below button to copy the code. By Python tutorial team
python - Sample - python code :
List1 = [1, 2, 3]
List2 = [2, 3, 4, 5]
# Add List2 to List1
List1.extend(List2)
print(List1)
#Add List1 to List2 now
List2.extend(List1)
print(List2)click below button to copy the code. By Python tutorial team
python programming - Output :
[1, 2, 3, 2, 3, 4, 5]
[2, 3, 4, 5, 1, 2, 3, 2, 3, 4, 5]sum(), count(), index(), min() and max() functions of List
- sum() : Calculates sum of all the elements of List.
Syntax:
python - Sample - python code :
sum(List)click below button to copy the code. By Python tutorial team
python - Sample - python code :
List = [1, 2, 3, 4, 5]
print(sum(List))click below button to copy the code. By Python tutorial team
python programming - Output :
15What happens if numeric value is not used a parameter?
Sum is calculated only for Numeric values, elsewise throws TypeError.
See example:
python - Sample - python code :
List = ['gfg', 'abc', 3]
print(sum(List))click below button to copy the code. By Python tutorial team
python programming - Output :
Traceback (most recent call last):
File "", line 1, in
sum(List)
TypeError: unsupported operand type(s) for +: 'int' and 'str'- count():Calculates total occurrence of given element of List.
Syntax:
python - Sample - python code :
List.count(element)click below button to copy the code. By Python tutorial team
python - Sample - python code :
List = [1, 2, 3, 1, 2, 1, 2, 3, 2, 1]
print(List.count(1))click below button to copy the code. By Python tutorial team
python programming - Output :
4- index(): Returns the index of first occurrence. Start and End index are not necessary parameters.
Syntax:
python - Sample - python code :
List.index(element[,start[,end]])click below button to copy the code. By Python tutorial team
python - Sample - python code :
List = [1, 2, 3, 1, 2, 1, 2, 3, 2, 1]
print(List.index(2))click below button to copy the code. By Python tutorial team
python programming - Output :
1Another example:
python - Sample - python code :
List = [1, 2, 3, 1, 2, 1, 2, 3, 2, 1]
print(List.index(2,2))click below button to copy the code. By Python tutorial team
python programming - Output :
4python - Sample - python code :
List = [1, 2, 3, 1, 2, 1, 2, 3, 2, 1]
# will check from index 2 to 3.
print(List.index(2,2,4))click below button to copy the code. By Python tutorial team
python - Sample - python code :
Traceback (most recent call last):
File "", line 1, in
List.index(2,2,4)
ValueError: tuple.index(x): x not in tupleclick below button to copy the code. By Python tutorial team
- min() : Calculates minimum of all the elements of List.
Syntax:
python - Sample - python code :
min(List)click below button to copy the code. By Python tutorial team
python - Sample - python code :
List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]
print(min(List))click below button to copy the code. By Python tutorial team
python programming - Output :
1.054- max(): Calculates maximum of all the elements of List.
Syntax:
python - Sample - python code :
max(List)click below button to copy the code. By Python tutorial team
python - Sample - python code :
List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]
print(max(List))click below button to copy the code. By Python tutorial team
python programming - Output :
5.33sort() and reverse() functions
- reverse(): Sort the given data structure (both tuple and list) in ascending order. Key and reverse_flag are not necessary parameter and reverse_flag is set to False, if nothing is passed through sorted().
Syntax:
python - Sample - python code :
sorted([list[,key[,Reverse_Flag]]])
list.sort([key,[Reverse_flag]])click below button to copy the code. By Python tutorial team
python - Sample - python code :
List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]
#Reverse flag is set True
List.sort(reverse=True)
#List.sort().reverse(), reverses the sorted list
print(List)click below button to copy the code. By Python tutorial team
python programming - Output :
[5.33, 4.445, 3, 2.5, 2.3, 1.054]python - Sample - python code :
List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]
sorted(List)
print(List)click below button to copy the code. By Python tutorial team
python programming - Output :
[1.054, 2.3, 2.5, 3, 4.445, 5.33]Deletion of List Elements
To Delete one or more elements, i.e. remove an element, many built in functions can be used, such as pop() & remove() and keywords such as del.
- pop(): Index is not a necessary parameter, if not mentioned takes the last index.
Syntax:
python - Sample - python code :
list.pop([index])click below button to copy the code. By Python tutorial team
Note: Index must be in range of the List, elsewise IndexErrors occurs.
python - Sample - python code :
List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]
print(List.pop())click below button to copy the code. By Python tutorial team
python programming - Output :
2.5python - Sample - python code :
List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]
print(List.pop(0))click below button to copy the code. By Python tutorial team
python programming - Output :
2.3- del() : Element to be deleted is mentioned using list name and index.
Syntax:
python - Sample - python code :
del list.[index]click below button to copy the code. By Python tutorial team
python - Sample - python code :
List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]
del List[0]
print(List)click below button to copy the code. By Python tutorial team
python programming - Output :
[4.445, 3, 5.33, 1.054, 2.5]- remove(): Element to be deleted is mentioned using list name and element.
Syntax:
python - Sample - python code :
list.remove(element)click below button to copy the code. By Python tutorial team
python - Sample - python code :
List = [2.3, 4.445, 3, 5.33, 1.054, 2.5]
List.remove(3)
print(List)click below button to copy the code. By Python tutorial team
python programming - Output :
[4.445, 5.33, 1.054, 2.5]