append(value)
extend(L)   添加指定列表的所有元素
insert(index, value)    插入
remove(value)
pop(index)        不指定删除最后一个,
clear()         清空
count(value)    统计有多少个
sort()          排序
reverse()       到序
copy()          潜复制

# ×3 获取一个新的列表
vec = [2, 4, 6]
new_vec = [3 * x for x in vec]
print(new_vec)

# 获取一个map
dict = [(x, x**2) for x in vec]
print(dict)

# 对序列中元素租个调用
fruits = [‘banana‘, ‘apple‘, ‘oragin‘]
new_fruits = [fruit.upper() for fruit in fruits]
print(new_fruits)

# 使用if
if_vec = [3 * x for x in vec if x > 3]
print(if_vec)

# 2个列表混搭的
vec2 = [4, 6, -1]
lista = [x * y for x in vec for y in vec2]
listb = [vec[i] * vec2[i] for i in range(len(vec))]

print(lista)
print(listb)

# 字典 推导
new_dict = {x + 10: x**2 + 10 for x in range(10)}
print(new_dict)

matrix = [
    [1, 2, 3, 4],
    [5, 6, 7, 8],
    [9, 10, 11, 12]
]

new_matrix = [[row[i] for row in matrix] for i in range(4)]
print(new_matrix)

# 上面的相当于
matrix_1 = []
for i in range(4):
    matrix_1.append([row[i] for row in matrix])
print(matrix_1)

# 获取进一步改写
matrix_2 = []
for i in range(4):
    ineer = []
    for row in matrix:
        ineer.append(row[i])
        print(row[i], end=‘, ‘)
    print(‘---‘, row)
print(matrix_2)

for row in matrix:
    print(row)

# 字典 推导
new_dict = {x + 10: x**2 + 10 for x in range(10)}
print(new_dict)

# 字典的遍历
for k, v in new_dict.items():
    print(k, v)
# 返回索引的, dict返回key
for i, v in enumerate(new_dict):
    print(i, v)

# 遍历2个货更多的序列, 使用 zip(), 去最短的序列
questions = [‘name‘, ‘quest‘, ‘favorite‘]
answers = [‘lancelot‘, ‘the‘, ‘blue‘, ‘abc‘]

for q, a in zip(questions, answers):
    print(q, a)

# 反向遍历集合
for q in reversed(questions):
    print(q)