我想写一段python代码，输出一张1920*1080的图片，这张图是160*90个正方形网格，边界线的宽度为1像素。输出到‘C:\Users\15000\Downloads\’，格式是png。

以下是实现你需求的代码：

import numpy as np
import matplotlib.pyplot as plt

def create_grid_image(width, height, grid_width, grid_height, line_width, file_path):
    image = np.zeros((height, width, 3), dtype=np.uint8)
    cell_width = width / grid_width
    cell_height = height / grid_height
    for i in range(grid_width + 1):
        start = int(cell_width * i)
        end = int(start + line_width)
        if end > width:
            end = width
        image[:, start:end, :] = 255
    for i in range(grid_height + 1):
        start = int(cell_height * i)
        end = int(start + line_width)
        if end > height:
            end = height
        image[start:end, :, :] = 255
    plt.imsave(file_path, image)

create_grid_image(1920, 1080, 160, 90, 1, "C:\Users\15000\Downloads\grid.png")

该代码使用了Numpy和Matplotlib库，先创建了一个黑色的图片，然后根据给定的网格大小计算每个格子的宽度和高度，并在图片上绘制白色的线来表示网格。最后使用Matplotlib保存图片。