基础数据类型(list列表)

初识列表

标准类型

数字

字符串

列表

元组

字典

　　

定义：[]内以逗号分隔，按照索引，存放各种数据类型，每个位置代表一个元素
特性：
　　　　1.可存放多个值
　　　　2.可修改指定索引位置对应的值，可变
　　　　3.按照从左到右的顺序定义列表元素，下标从0开始顺序访问，有序

列表的创建

　　list_test=[’lhf‘,12,'ok']
　　或
　　list_test=list('abc')
　　或
　　list_test=list([’lhf‘,12,'ok'])

列表的常用操作

索引

lst = [1,'alex','wusir',2]
print(lst[0])
print(lst[1])
print(lst[2])
print(lst[3])

切片

lst = [1,'alex','wusir',2,3,'哪吒']
print(lst[1:3])
print(lst[1:4:2])
print(lst[::-1])

 

追加

lst = [1,'alex','wusir',2]
lst.append('aaa')
print(lst)

删除

lst = [1,'alex','wusir',2,'aaa','bbb']
lst.remove('alex')

print(lst)

lst.pop()

print(lst)

lst.pop(0)

print(lst)

lst.clear()

print(lst)

del lst[0]

print(lst)

修改

lst = [1,'alex','wusir',2,3,'哪吒']
lst[2] = '武沛齐'
print(lst)

长度

lst = [1,'alex','wusir',2]
print(len(lst))

循环

lst = [1,'alex','wusir',2]
for i in lst:
    print(i)

包含

lst = [1,'alex','wusir',2]
print('alex' in lst)
print('1' in lst)
print('1' not in lst)

 

列表的工厂函数list()

class list(object):
    """
    list() -> new empty list
    list(iterable) -> new list initialized from iterable's items
    """
    def append(self, p_object): # real signature unknown; restored from __doc__
        """ L.append(object) -> None -- append object to end """
        pass
def clear(self): # real signature unknown; restored from doc

""" L.clear() -> None -- remove all items from L """

pass
def copy(self): # real signature unknown; restored from doc

""" L.copy() -> list -- a shallow copy of L """

return []
def count(self, value): # real signature unknown; restored from doc

""" L.count(value) -> integer -- return number of occurrences of value """

return 0
def extend(self, iterable): # real signature unknown; restored from doc

""" L.extend(iterable) -> None -- extend list by appending elements from the iterable """

pass
def index(self, value, start=None, stop=None): # real signature unknown; restored from doc

"""

L.index(value, [start, [stop]]) -> integer -- return first index of value.

Raises ValueError if the value is not present.

"""

return 0
def insert(self, index, p_object): # real signature unknown; restored from doc

""" L.insert(index, object) -- insert object before index """

pass
def pop(self, index=None): # real signature unknown; restored from doc

"""

L.pop([index]) -> item -- remove and return item at index (default last).

Raises IndexError if list is empty or index is out of range.

"""

pass
def remove(self, value): # real signature unknown; restored from doc

"""

L.remove(value) -> None -- remove first occurrence of value.

Raises ValueError if the value is not present.

"""

pass
def reverse(self): # real signature unknown; restored from doc

""" L.reverse() -- reverse IN PLACE """

pass
def sort(self, key=None, reverse=False): # real signature unknown; restored from doc

""" L.sort(key=None, reverse=False) -> None -- stable sort IN PLACE """

pass
def add(self, *args, **kwargs): # real signature unknown

""" Return self+value. """

pass
def contains(self, *args, **kwargs): # real signature unknown

""" Return key in self. """

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 from iterable'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 selfvalue.n """

pass
@staticmethod # known case of new

def new(*args, **kwargs): # real signature unknown

""" Create and return a new object.  See help(type) for accurate 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() -- return a reverse iterator over the list """

pass
def rmul(self, args, **kwargs): # real signature unknown

""" Return selfvalue. """

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 L in memory, in bytes """

pass
hash = None
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