List of Python

A list is also a serialized data type that can be accessed by subscript or slice operations to access a contiguous element or segment.

First, create a list

A list can be defined by square brackets ' [] ' and created by assigning variables.

>>> L1 = ['abc','456','xyz'  ]>>> l1['ABC'456   'xyz']

You can nest a list in a list, like this:

>>> L2 = ['ABC','456','XYZ',['789','LMN']]>>>l2['ABC','456','XYZ', ['789','LMN']]

Second, the operation of the list

A. Access

Use the slice operation and index values to access the list.

>>>l2['ABC','456','XYZ', ['789','LMN']]>>>L2[0]'ABC'>>> l2[-1]['789','LMN']>>> l2[3][1]'LMN'

Index

B. Updates

Use the Append () method to append the element to the list.

>>> L1 = ['ABC','456','XYZ']>>> L1.append ('Li')>>>l1['ABC','456','XYZ','Li']

Append

Three, several useful functions

1. Len ()

Number of elements in the statistics list

>>> l3['2'3'5'  '6'9']>>> Len ( L3)5

Len

2. Max () &min ()

Gets the maximum and minimum values in the list

>>> Max (L3)'9'>>> min (L3)'2  '

Max&min

3. Enumerate ()

Iterate over the elements in the sequence and their subscripts

 for  in Enumerate ([+]):print11 22 3

Enumerate

4. Sum

Add the values in the list

>>> L4 = [Int ('2'), int ('4')]>>> sum (L4)6

sum

Note: only integers and string types can be added, otherwise an error occurs

Iv. built-in functions

    defAppend (self, p_object):#add an object to the list    defClear (self):#Clear List    defcopy (self):#Shallow Copy    defcount (self, value):#Count the number of occurrences of an object in a list    defExtend (self, iterable):#add content to the list>>>L1 ['ABC','456','XYZ','Li']    >>>L1 ['ABC','456','XYZ','Li']    >>>L2 ['ABC','456','XYZ', ['789','LMN']]    >>>L1.extend (L2)>>>L1 ['ABC','456','XYZ','Li','ABC','456','XYZ', ['789','LMN']]    defIndex (self, value, Start=none, stop=None):#gets the index position in the list        """def insert (self, Index, p_object): #指定下标插入元素 def pops (self, index=none): #指定下标删除元素, and gets the delete element (if No object specified, default is last value) def remove (self, value): #指定值删除的元素 def reverse (self): #反向列表中元素 def sort (self, key=none, R    Everse=false): #对列表中的元素进行排序 >>> l3 = [' 3 ', ' 6 ', ' 5 ', ' 9 ', ' 2 '] >>> l3.sort () >>> L3 [' 2 ', ' 3 ', ' 5 ', ' 6 ', ' 9 '] def __add__ (self, *args, **kwargs): # Real Signature Unknown"""Return Self+value."""Pass def __contains__ (self, *args, **kwargs): # Real Signature Unknown"""Return KeyinchSelf."""Pass def __delitem__ (self, *args, **kwargs): # Real Signature Unknown"""Delete Self[key]."""Pass def __eq__ (self, *args, **kwargs): # Real Signature Unknown"""Return Self==value."""Pass def __getattribute__ (self, *args, **kwargs): # Real Signature Unknown"""Return getattr (self, name)."""Pass def __getitem__ (self, y): # real signature unknown; restored from __doc__"""X.__getitem__(y) <==> X[y]"""Pass def __ge__ (self, *args, **kwargs): # Real Signature Unknown"""Return Self>=value."""Pass def __gt__ (self, *args, **kwargs): # Real Signature Unknown"""Return Self>value."""Pass def __iadd__ (self, *args, **kwargs): # Real Signature Unknown"""Implement Self+=value."""Pass def __imul__ (self, *args, **kwargs): # Real Signature Unknown"""Implement Self*=value."""Pass def __init__ (self, seq= ()): # Known special case of list.__init__"""list ()-New empty list List (iterable)New list initialized fromIterable's Items        #(copied from class Doc)        """Pass def __iter__ (self, *args, **kwargs): # Real Signature Unknown"""Implement iter (self)."""Pass def __len__ (self, *args, **kwargs): # Real Signature Unknown"""Return len (self)."""Pass def __le__ (self, *args, **kwargs): # Real Signature Unknown"""Return Self<=value."""Pass def __lt__ (self, *args, **kwargs): # Real Signature Unknown"""Return Self<value."""Pass def __mul__ (self, *args, **kwargs): # Real Signature Unknown"""Return SELF*VALUE.N"""Pass @staticmethod # known case of __new__ def __new__ (*args, **kwargs): # Real Signature Unknown """Create and returnA new object. See Help (Type) forAccurate signature."""Pass def __ne__ (self, *args, **kwargs): # Real Signature Unknown"""Return Self!=value."""Pass def __repr__ (self, *args, **kwargs): # Real Signature Unknown"""Return repr (self)."""Pass def __reversed__ (self): # Real Signature unknown, restored from __doc__"""L.__reversed__() --returnA reverse iterator over the list"""Pass def __rmul__ (self, *args, **kwargs): # Real Signature Unknown"""Return Self*value."""Pass def __setitem__ (self, *args, **kwargs): # Real Signature Unknown"""Set Self[key] to value."""Pass def __sizeof__ (self): # Real Signature unknown, restored from __doc__"""L.__sizeof__()--size of LinchMemoryinchbytes"""Pass __hash__ = None

method&f (x)

List of Python