Python sequence (list, tuple, dictionary) additions and deletions

List

Operation	List
	Method	Example
Increase	List.append (obj) add element to end	eg. >>> list1=[' hello ', ' world ', ' How ', ' is ', ' you ' >>> list1.append ('! ') >>> List1 [' Hello ', ' world ', ' How ', ' is ', ' you ', '! ']
	List.insert (index, obj) add element to specified position Index: Indexed location Obj: Content	eg. >>> List1 [' Hello ', ' world ', ' How ', ' is ', ' you ', '! '] >>> List1.insert (1, ', ') >>> List1 [' Hello ', ', ', ' world ', ' How ', ' is ', ' you ', '! ']
	List.extend (list_i) Adds an element from the List_i list to the list	eg. >>> List [' Hello ', ' how ', ' is ', ' you '] >>> list.extend ([' Good ', ' girl ') >>> List [' Hello ', ' how ', ' is ', ' you ', ' good ', ' girl ']
Delete	List.pop (): Removes the element at the end of the list by default List.pop (Index) Deletes the element at the specified position, index	eg. >>> List1 [' Hello ', ', ', ' world ', ' How ', ' is ', ' you ', '! '] >>> List1.pop () ‘!‘ >>> List1.pop (1) ‘,‘
	Del List[index] Deletes the element at the specified position, index Del List Delete entire list	eg. >>> List1 [' Hello ', ' world ', ' How ', ' is ', ' you '] >>> del List1[1] >>> List1 [' Hello ', ' how ', ' is ', ' you '] >>> List1 [' Hello ', ' how ', ' is ', ' you '] >>> del List1 >>> List1 Traceback (most recent): File "<stdin>", line 1, in <module> Nameerror:name ' List1 ' is not defined
	List.remove (obj) Remove the first element of the list equal to obj	eg. >>> list=[' hello ', ' world ', ' How ', ' is ', ' you ' >>> List.remove (' World ') >>> List [' Hello ', ' how ', ' is ', ' you ']
	List.clear () Clear all the contents of the list	eg. >>> list=[' hello ', ' world ', ' How ', ' is ', ' you ' >>> List.clear () >>> List []
Modify	List[index]=obj Modifies the element at the specified position	eg. >>> List1 [' Hello ', ' world ', ' How ', ' is ', ' you '] >>> list1[0]= ' Hi ' >>> List1 [' Hi ', ' world ', ' How ', ' is ', ' you ']
Inquire	List[index] Indexed by subscript, starting from 0	eg. >>> list=[' hello ', ' world ', ' How ', ' is ', ' you ' >>> List[2] ' How '
	LIST[A:B] Slices, Gu Tou regardless of the tail	eg. >>> list=[' hello ', ' world ', ' How ', ' is ', ' you ' >>> List[0:3] [' Hello ', ' world ', ' how '] >>> list[1:] [' World ', ' How ', ' is ', ' you '] >>> List[:3] [' Hello ', ' world ', ' how '] >>> list[:] [' Hello ', ' world ', ' How ', ' is ', ' you ']

Meta-group

Operation	Meta-group
	Method	Example
Increase	Tup=tup1+tup2 Tuples do not support modification, but can be increased by connecting combinations	eg. >>> (tup1=) >>> tup2= (4,5,6) >>> tup=tup1+tup2 >>> Tup (1, 2, 3, 4, 5, 6)
Delete	Del Tup Tuples do not support single element deletions, but can delete entire tuples	eg. >>> Tup (1, 2, 3, 4, 5, 6) >>> del Tup >>> Tup Traceback (most recent): File "<stdin>", line 1, in <module> Nameerror:name ' tup ' is not defined
Modify	TUP=TUP[INDEX1],TUP1[INDEX2], ... TUP=TUP[INDEX1:INDEX2] Tuples are immutable types and cannot modify elements of tuples. A new tuple can be constructed from existing string concatenation	eg. >>> tup= (' A ', ' B ', ' C ', ' d ', ' e ') >>> Tup=tup[1],tup[2],tup[4] >>> Tup (' B ', ' C ', ' e ') >>> tup= (' A ', ' B ', ' C ', ' d ', ' e ') >>> Tup=tup[1:3] >>> Tup (' B ', ' C ')
Inquire	Tup[index] Indexed by subscript, starting from 0	eg. >>> tup= (1,2,3,4) >>> Tup[2] 3
	TUP[A:B] Slices, Gu Tou regardless of the tail	eg. >>> tup= (1,2,3,4) >>> Tup[1:3] (2, 3) >>> tup[1:] (2, 3, 4) >>> Tup[:3] (1, 2, 3) >>> tup[:] (1, 2, 3, 4)

Dictionary

Operation	Dictionary
	Method	Example
Increase	Dict[key]=value Adding elements by assigning a value	eg. >>> dict={' name ': ' Li ', ' Age ': 1} >>> dict[' class ']= ' first ' >>> Dict {' name ': ' Li ', ' age ': 1, ' class ': ' First '}
	Dict.update (dict_i) Update the key/value pairs of the new dictionary dict_i to the Dict (contains a different key from the dict for dict_i)	eg. >>> dict={' name ': ' Li ', ' age ': 1, ' class ': ' First '} >>> dict.update (school= ' Wawo ') >>> Dict {' name ': ' Li ', ' age ': 1, ' class ': ' First ', ' School ': ' Wawo '}
Delete	Del Dict[key] Delete a single element, using key to specify the deletion Del Dict Delete Dictionary	eg. >>> Dict {' name ': ' Li ', ' age ': 1, ' class ': ' First '} >>> del dict[' class '] >>> Dict {' name ': ' Li ', ' Age ': 1} >>> dict1={' name ': ' Li ', ' age ': 1, ' class ': ' First '} >>> del Dict1 >>> Dict1 Traceback (most recent): File "<stdin>", line 1, in <module> Nameerror:name ' Dict1 ' is not defined
	Dict.pop (Key) Delete a single element, using key to specify the deletion	eg. >>> dict={' name ': ' Li ', ' age ': 1, ' class ': ' First '} >>> dict.pop (' name ') ' Li ' >>> Dict {' Age ': 1, ' class ': ' First '}
	Dict.clear () Clear All content	eg. >>> Dict {' Age ': 1, ' class ': ' First '} >>> Dict.clear () >>> Dict {}
Modify	Dict[key]=value Modifying a method by re-assigning a value to an existing key	eg. >>> Dict {' name ': ' Pang ', ' age ': 1, ' class ': ' First ', ' School ': ' Wawo '} >>> dict[' name ']= ' Li ' >>> Dict {' name ': ' Li ', ' age ': 1, ' class ': ' First ', ' School ': ' Wawo '}
	Dict.update (dict_i) Update the key/value pairs of the dictionary dict_i to the Dict (contains the same key as Dict for dict_i)	eg. >>> Dict {' name ': ' Li ', ' age ': 1, ' class ': ' First ', ' School ': ' Wawo '} >>> dict.update (name= ' pang ') >>> Dict {' name ': ' Pang ', ' age ': 1, ' class ': ' First ', ' School ': ' Wawo '}
Inquire	Dict[key] Accessing value values with key	eg. >>> dict={' name ': ' Pang ', ' age ': 1, ' class ': ' First ', ' School ': ' Wawo '} >>> dict[' name '] ' Pang '
	Dict.items () Returns an array of traversed (key, value) tuples as a list	eg. >>> dict={' name ': ' Pang ', ' age ': 1, ' class ': ' First ', ' School ': ' Wawo '} >>> Dict.items () Dict_items ([' Name ', ' Pang '), (' Age ', 1), (' Class ', ' first '), (' School ', ' Wawo ')])
	Dict.keys () Returns a dictionary of all key values in a list Dict.values () Returns a dictionary of all values in a list	eg. >>> Dict.keys () Dict_keys ([' Name ', ' Age ', ' class ', ' School ') >>> dict.values () Dict_values ([' Pang ', 1, ' first ', ' Wawo ')
	Dict.get (Key) Returns the corresponding dictionary value for the specified key, without returning none	eg. >>> dict.get (' age ') 1

Python sequence (list, tuple, dictionary) additions and deletions