Python保存数据到CSV文件

利用字符串的形式将多行数据保存到CSV文件。

a = np.array([(1,2), (3,4), (5,6), (7,8)])
lines = ""
for i in a:
	for j in a:
		dis = np.sqrt((np.sum(i-j)**2))
		lines += "%.2f"%dis + ", "
	lines += "\n"
file = open("result.csv", mode='w', encoding='utf-8')
file.write(lines)
file.close()