for _ in range(matrix_rows): matrix.append(list(map(float, input().rstrip().split())))
时间: 2023-12-15 13:03:53 浏览: 35
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相关问题
for _ in range(n): a.append([c for c in input()])
This code creates a 2D list of size n x m, where n is the number of rows and m is the number of columns. Each element of the list is a character entered by the user.
The code uses a for loop to iterate n number of times. In each iteration, the user is prompted to enter a string of characters using the input() function. The string is then converted into a list of characters using a list comprehension and appended to the list a.
For example, if n=3 and the user enters the following strings:
"abc"
"def"
"ghi"
Then the resulting 2D list would be:
[['a', 'b', 'c'], ['d', 'e', 'f'], ['g', 'h', 'i']]
def make_grid(rows, width): grid = [] gap = width // rows for i in range(rows): grid.append([]) for j in range(rows): node = Node(i, j, gap, rows) grid[i].append(node) return grid解释这段代码
这是一个 Python 函数,其作用是根据输入的行数和宽度创建一个二维列表,即网格。每个节点都是一个 Node 类的实例,包含节点的行、列、大小和网格的总行数。其中,行和列的数量相同,都等于输入的行数。
具体地,该函数首先创建一个空的列表 `grid`。接着,计算出每个节点的大小 `gap`,即网格的宽度除以行数,以便后面确定每个节点的坐标和大小。
然后,通过两个 for 循环,遍历每一行和每一列,并为每个节点创建一个 Node 实例。根据其行、列、大小和网格总行数,Node 实例可以计算出自己在网格中的位置和边界。最后,将每一行的节点列表添加到网格中,最终返回完整的网格列表。