# Python Beginner Day3--(Introduction to List,tuple,dict,set internal functions)

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List Internal Methods summary

1,def Append (self, p_object): Adding elements to the original list

Li = List ((2,3,4,6,9,7))

Li.append (' a ')

Print (LI) results: [2, 3, 4, 6, 9, 7, ' a ']

2,def Clear (self): Clears all elements in the list

Li = List ((2,3,4,6,9,7))

Li.clear ()

Print (LI) results: []

3,def copy (self): Copy to List

Li = List ((2,3,4,6,9,7))

result = Li.copy ()

Print (Result) results: [2, 3, 4, 6, 9, 7]

4,def count (self, value): The number of occurrences of the specified element in the statistics list

Li = List ((2,3,4,6,9,7,2))

result = Li.count (2)

Print (Result) results: 2

5,def Extend (self, iterable): Extending the list

Li = List ((2,3,4,6,9,7,2))

Li.extend (' good ')

Print (LI) results: [2, 3, 4, 6, 9, 7, 2, ' g ', ' o ', ' o ', ' d ']

6,def index (self, value, Start=none, Stop=none): Outputs the subscript of the pointing element, you can specify the starting position of the lookup

Li = List ((2,3,4,6,9,7,2))

result = Li.index (2,1)

Print (Result) results: 6

7,def Insert (self, Index, p_object): Inserts an element into the list and places the insertion

Li = List ((2,3,4,6,9,7,2))

Li.insert (2, ' t ')

Print (LI) results: [2, 3, ' t ', 4, 6, 9, 7, 2]

8,def pop (self, index=none): Removes the element from the list, you can specify the subscript, by default remove the last Li = List ((2,3,4,6,9,7,2)) ret = Li.pop () print (LI) Result: [    2, 3, 4, 6, 9, 7] Print (ret) results: 2 9,def Remove (self, value): Removes the specified element li = List ((2,3,4,6,9,7,2)) Li.remove (2) Print (LI) Results: [3, 4, 6, 9, 7, 2]

10,def reverse (self): reverses a sequence li = List ((2,3,4,6,9,7,2)) Li.reverse () print (LI) results: [2, 7, 9, 6, 4, 3, 2] 11,de F Sort (self, key=none, reverse=false): Sort a list li = List ((2,3,4,6,9,7,2)) Li.sort () print (LI) results: [2, 2, 3, 4, 6, 7, 9]

Tuple Internal Method Summary

1,def count (self, value): The number of occurrences of the specified element in the statistics tuple Li = tuple ((1,3,6,12,8,15,12)) ret = Li.count (p) print (ret) Results: 2 2,def index (self, value, Start=none, Stop=none): Outputs the subscript of the pointing element, you can specify the starting position of the lookup Li = tuple ((1,3,6,12,8,15,12)) ret = Li.index ( 8) print (ret) Results: 4

Dict Internal Methods Summary

1,def Clear (self): Clears all elements in the dictionary li = {' K1 ': 1, ' K2 ': 2, ' K3 ': \$, ' K4 ': 3, ' K5 ': ' A ',} li.clear () print (LI) results: {}

2,def copy (self): Copy dictionary li = {' K1 ': 1, ' K2 ': 2, ' K3 ': Ten, ' K4 ': 3, ' K5 ': ' A ',} ret = Li.copy () print (LI) Result: {' K4 ': 3, ' K5 ': ' A ', ' K2 ': 2, ' K1 ': 1, ' K3 ': 10}

3,def Fromkeys (*args, **kwargs): Used to create a new dictionary with the SEQ elements in the dictionary key,value for all keys corresponding to the value Li = {' K1 ': 1, ' K2 ': 2, ' K3 ': Ten, ' K4 ': 3, ' K5 ': ' A ',} ret = Li.fromkeys ([' X1 ', ' x2 '], 6) print (LI) Result: {' K2 ': 2, ' K3 ': Ten, ' K1 ': 1, ' K4 ': 3, ' K5 ': ' A '} print (r ET) Result: {' x2 ': 6, ' X1 ': 6}

4,def Get (self, k, d=none): Gets the value of a key in the dictionary, returns the default value if it does not exist in the key dictionary (the default value is initially empty) Li = {' K1 ': 1, ' K2 ': 2, ' K3 ': Ten, ' K4 ': 3, ' K5 ': ' A ',} ret = li.get (' K3 ', 5) Ret1 = Li.get (' x1 ', ' t ') print (ret) results: print (RET1) results: t

5,def items: Gets the key value of the dictionary to Li = {' K1 ': 1, ' K2 ': 2, ' K3 ': Ten, ' K4 ': 3, ' K5 ': ' A ',} ret = Li.items () print (ret) Results: Dict_items (' K2 ', 2), (' K3 ', Ten), (' K1 ', 1), (' K5 ', ' a '), (' K4 ', 3)])

6,def keys (self): Gets the dictionary key li = {' K1 ': 1, ' K2 ': 2, ' K3 ': 3, ' K4 ': ' A ',} ret = K5 () print (ret) results: DIC T_keys ([' K3 ', ' K2 ', ' K1 ', ' K5 ', ' K4 '])

7,def pop (self, k, d=none): Removes the Pointing key value pair, if key is not in the dictionary, returns the specified value, if the specified value is not set, then the error    li = {' K1 ': 1, ' K2 ': 2, ' K3 ': \$, ' K4 ': 3, ' K5 ': ' A ',}    ret = Li.pop (' K2 ')    Ret1 = Li.pop (' x1 ', ')    print (LI)    & nbsp;     result: {' K1 ': 1, ' K5 ': ' A ', ' K4 ': 3, ' K3 ': '    print ' (ret)          results: 2    print (RET1)        results: 8,def Popitem (self): Randomly removes a pair of key values from the dictionary and returns key and value to Cheng Yuanju    li = {' K1 ': 1, ' K2 ': 2, ' K3 ': 3, ' K4 ': ' A ', ' K5 ': ' A ',}    ret = Li.popitem ()    Print (LI)           result: {' K2 ': 2, ' K3 ': Ten, ' K4 ': 3, ' K5 ': ' A '}    print (ret)          results: (' K1 ', 1)

9,def SetDefault (self, k, d=none): Gets the value corresponding to a key in the dictionary, returns the default value if it does not exist in the key dictionary (default is initially empty)    li = {' K1 ': 1, ' K2 ': 2, ' K3 ' : Ten, ' K4 ': 3, ' K5 ': ' A ',}    ret = Li.setdefault (' K3 ', \$)    Ret1 = Li.setdefault (' x2 ')    pri NT (LI)            results: {' K1 ': 1, ' K4 ': 3, ' K5 ': ' A ', ' x2 ': None, ' K3 ': 10 , ' K2 ': 2}    print (ret)           results: Ten    print ( RET1)          results: None, def update (self, E=none, **f): Update the dictionary if the key in E is in the original dictionary, Then update value, if not, increase the Key-value key value pair     li = {' K1 ': 1, ' K2 ': 2,}     li.update ({' X1 ': \$, ' K2 ': 30 , ' x2 ': +})     print (LI)            result: {' x2 ': 40, ' K2 ': +, ' x1 ':, ' K1 ': 1}

One, def values (self): Gets the values in the dictionary li = {' x2 ': +, ' K2 ': +, ' x1 ': +, ' K1 ': 1} ret = Li.values () print (ret) Results: Dict_values ([20, 30, 1, 40])

Set Internal Method Summary

1, def add (self, *args, **kwargs): Adds the element li = set ([1,2,4,6, ' s ', ' a ']) to the collection Li.add (' Good ') print (LI) Result: {1, 2, 4, 6, ' a ', ' good ', ' s '}

2,def Clear (Self, *args, **kwargs): Clears all elements in the collection Li = Set ([1,2,4,6, ' s ', ' a ']) Li.clear () print (LI) Result: set ()

3,def copy (self, *args, **kwargs): Copy collection li= set ([1,2,4,6, ' s ', ' a ']) ret = Li.copy () print (ret) Result: {1, 2, 4, 6, ' a ', ' s '}

4,def difference (self, *args, **kwargs): Removes the same part of the collection as the parameter, returns a new set of Li = Set ([1,2,4,6, ' s ', ' a ']) ret = li.difference (4, 6, ' P ', ' Q ')) print (ret) Result: {1, 2, ' s ', ' a '}

5, Def difference_update (self, *args, **kwargs): Remove li = Set ([1,2,4,6, ' s ', ' a ']) from the same part in the original set as the parameter, Li.difference_update (4 , 6, ' P ', ' Q ')) print (LI) Result: {1, 2, ' a ', ' s '}

6,def Discard (self, *args, **kwargs): Removes a specified element from the binding, if the element is in the collection, then remove, if not, do nothing li = set ([1,2,4,6, ' s ', ' a ']) Li.discard (' X ') print (LI) Result: {1, 2, 4, 6, ' a ', ' s '}

7,def intersection (self, *args, **kwargs): A new collection of two identical elements in a collection returns LI = Set ([1,2,4,6, ' s ', ' a ']) ret = li.intersection (9, ' Y ', 1,2,4)) print (ret) results: {1, 2, 4}

8,def intersection_update (self, *args, **kwargs): Remove li = Set ([1,2,4,6, ' s ', ' a ']) in the original set with a different part of the parameter Li.intersection_updat E ((9, ' Y ', 1,2,4)) print (LI) results: {1, 2, 4}

9,def Isdisjoint (self, *args, **kwargs): Determines whether two sets have intersections if there is a return of false if there is no true li = Set ([1,2,4,6, ' s ', ' a ']) ret = LI.ISDI Sjoint ((+, ' O ' P ')) Ret1 = Li.isdisjoint ((9,8, ' o ', ' P ')) print (ret) Result: False print (RET1) Result: True

10,def Issubset (self, *args, **kwargs) and Def issuperset (self, *args, **kwargs): Determines whether a subset or parent set Li = Set ([1,2,4,6, ' s ', ' a ']) ret = Li.issubset (()) Ret1 = Li.issuperset (()) print (ret) Result: False print (RET1) result : True

11,def pop (self, *args, **kwargs): Randomly deletes an element in the collection, returning the deleted element li = set ([1,2,4,6, ' s ', ' a ']) ret = Li.pop () print (LI) Results: {2, 4, 6, ' a ', ' s '} print (ret) Results: 1

12,def Remove (self, *args, **kwargs): Deletes the specified element in the collection, no return value Li = Set ([1,2,4,6, ' s ', ' a ']) Li.remove (2) print (LI) Result: {1, 4, 6, ' s ', ' a '}

13,def symmetric_difference (self, *args, **kwargs): A new collection of two different elements in a collection returns LI = Set ([1,2,4,6, ' s ', ' a ']) ret = Li.symme Tric_difference ((4,6, ' u ', ' I ')) print (ret) Result: {1, 2, ' I ', ' u ', ' a ', ' s '}

14,def symmetric_difference_update (self, *args, **kwargs): Removes the same elements in the original collection as the parameters, and the different elements retain the LI = set ([1,2,4,6, ' s ', ' a ']) Li . Symmetric_difference_update ((4,6, ' u ', ' I ')) print (LI) Result: {1, 2, ' a ', ' I ', ' u ', ' s '}

15,def Union (Self, *args, **kwargs): Joins two collections into a new set li = Set ([1,2,4,6, ' s ', ' a ']) ret = Li.union ((4,6, ' u ', ' i ')) p Rint (ret) Results: {1, 2, 4, ' A ', 6, ' U ', ' s ', ' I '}

16,def Update (self, *args, **kwargs): Update a collection Li = Set ([1,2,4,6, ' s ', ' a ']) li.update ((4,6, ' u ', ' I ') print (LI) Results: {1, 2, 4, 6, ' u ', ' I ', ' a ', ' s '}

Python Beginner Day3--(Introduction to List,tuple,dict,set internal functions)

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