python创建与遍历List二维列表

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python 创建List二维列表

lists = [[] for i in range(3)]  # 创建的是多行三列的二维列表

for i in range(3):

    lists[0].append(i)

for i in range(5):

    lists[1].append(i)

for i in range(7):

    lists[2].append(i)

print("lists is:", lists)

# lists is: [[0, 1, 2], [0, 1, 2, 3, 4], [0, 1, 2, 3, 4, 5, 6]]

---

使用二维列表索引遍历二维列表

• 注意python中二维列表和matlab以及C和JAVA中一样，不需要每行中列的数量相等

sum_0 = 0

for i in range(len(lists)):

    for j in range(len(lists[i])):

        print(lists[i][j])

        sum_0 += lists[i][j]

print("The sum_0 of Lists:", sum_0)

# 0

# 1

# 2

# 0

# 1

# 2

# 3

# 4

# 0

# 1

# 2

# 3

# 4

# 5

# 6

# The sum of Lists: 34

---

使用二维列表句柄遍历二维列表

sum_1 = 0

for i in lists:

    for j in i:

        sum_1 += j

print("The sum_1 of Lists:", sum_1)

# The sum_1 of Lists: 34