参考地址：https://matplotlib.org/api/_as_gen/matplotlib.pyplot.scatter.html?highlight=scatter#matplotlib.pyplot.scatter
函数原型：matplotlib.pyplot.scatter(x, y, s=None, c=None, marker=None, cmap=None, norm=None, vmin=None, vmax=None, alpha=None, linewidths=None, verts=None, edgecolors=None, *, data=None, **kwargs)
参数解释：x,y：数据坐标
s:散点的大小
c:散点的颜色 如果输入int就会自动生成指定数量种类的颜色给散点显示 如c=3就会生成3种不同颜色的散点
marker:散点的形状，参数对应表如下：
| marker | symbol | description |
|---|---|---|
"." |
 |
point |
"," |
 |
pixel |
"o" |
 |
circle |
"v" |
 |
triangle_down |
"^" |
 |
triangle_up |
"<" |
 |
triangle_left |
">" |
 |
triangle_right |
"1" |
 |
tri_down |
"2" |
 |
tri_up |
"3" |
 |
tri_left |
"4" |
 |
tri_right |
"8" |
 |
octagon |
"s" |
 |
square |
"p" |
 |
pentagon |
"P" |
 |
plus (filled) |
"*" |
 |
star |
"h" |
 |
hexagon1 |
"H" |
 |
hexagon2 |
"+" |
 |
plus |
"x" |
 |
x |
"X" |
 |
x (filled) |
"D" |
 |
diamond |
"d" |
 |
thin_diamond |
"|" |
 |
vline |
"_" |
 |
hline |
0 (TICKLEFT) |
 |
tickleft |
1 (TICKRIGHT) |
 |
tickright |
2 (TICKUP) |
 |
tickup |
3 (TICKDOWN) |
 |
tickdown |
4 (CARETLEFT) |
 |
caretleft |
5 (CARETRIGHT) |
 |
caretright |
6 (CARETUP) |
 |
caretup |
7 (CARETDOWN) |
 |
caretdown |
8 (CARETLEFTBASE) |
 |
caretleft (centered at base) |
9 (CARETRIGHTBASE) |
 |
caretright (centered at base) |
10 (CARETUPBASE) |
 |
caretup (centered at base) |
11 (CARETDOWNBASE) |
 |
caretdown (centered at base) |
"None", " " or "" |
nothing | |
'$...$' |
 |
Render the string using mathtext. E.g "$f$" for marker showing the letter f. |
verts |
A list of (x, y) pairs used for Path vertices. The center of the marker is located at (0,0) and the size is normalized, such that the created path is encapsulated inside the unit cell. | |
| path | A Path instance. |
|
(numsides, style, angle) |
The marker can also be a tuple
|
cmap:指定颜色映射
norm,vmin,vmax..:都是亮度,外观相关设置详见顶部网址。