列表内置方法

lt = [1,2,3,4]
print(lt[1])
lt[1] = 3
print(lt)

print(lt[:])#冒号左边没有左边取到头，右边没有则右边取到头
print(lt[1:2])#顾头不顾尾，只打印索引号为1的元素
print(lt[1:4:2])#步长为2

for i in lt:
    print(i**2)#打印列表每一个值的幂

print(1 in lt)
print(5 in lt)

lt.append(5)#往列表的最后一位添加元素
print(lt)

print(len(lt))

print(lt)
del lt[0]
print(lt)

lt=[1,2,3,4,5]
lt.insert(0,0)#向前插入
print(lt)

lt = [11,22,33,44,55]
lt.pop(0)
print(lt)

lt.remove(22)
print(lt)

lt = [11,11,11,22]
print(lt.count(11))

print(lt.index(11))#找到了就返回

lt = [1,2,3,4,5]
lt.clear()
print(lt)

lt = [1,2,3,4]
lt1 = lt.copy()
print(lt1)

lt1 = [1,2,3]
lt2 = [4,5,6]
lt1.extend(lt2)
print(lt1)

lt = [1,2,3,4]
lt.reverse()
print(lt)

list.sort(cmp=None, key=None, reverse=False)

lt = [2,3,1,0,4]
lt.sort(reverse=True)
print(lt)

for i in range(len(lt)):
    for j in range(len(lt)):
        if lt[i]<lt[j]:
            lt[i],lt[j] = lt[j],lt[i]
print(lt)