import urllib.request

def gt(url):
	# 字节单位
	fb = int(urllib.request.urlopen(url).headers['Content-Length'])
	# KB单位,保留两位小数
	fk = "%.2f"%(fb/1024)
	return {"bytes":fb,"KB":fk}

print(gt("https://pic.cnblogs.com/avatar/2635562/20211115174245.png"))