python学习：创建与遍历List二维列表

1.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]]
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2.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
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3.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
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