中国88个超500万人口的大中城市都在哪里？Python动态图告诉你！

今天药忘吃喽~ 2022-08-29 00:07 176阅读 0赞

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**我国的城市层次**

除港澳台外，中国一共有337个地级市(含4个直辖市)。一般综合考虑城市人口规模和城市经济发展水平等因素，可以将城市分成一线、新一线、二线、三线、四线、五线等不同层次。

下面我们来看一份第一财经新一线城市研究所发布的一份2021城市商业魅力排行榜城市层次榜单。

![5810c220fa93b2c8ff8969217db545fa.png][]

**我国城市人口规模**

如果仅仅考虑城市人口规模的话，根据最新人口普查公开数据，中国337个地级市当中，一共有88个城市超过500万个。它们是哪些城市呢？我们用Python动态图盘点一下吧！

**先上图片**

![97df7dc9e6fa8f5e7027a41eff7827aa.png][]

**再上****视频**

**最后上代码**

import numpy as np 
    import pandas as pd 
    import geopandas as gpd 
    import shapely 
    from shapely import geometry as geo 
    from shapely import wkt 
    import geopandas as gpd 
    import matplotlib.pyplot as plt 
    import matplotlib.animation as  animation 
    import contextily as ctx
    
    import imageio
    import os 
    from PIL import Image
    
    plt.rcParams['font.family'] = 'sans-serif'
    plt.rcParams['font.sans-serif'] = ['SimHei']
    plt.rcParams['axes.unicode_minus'] = False
    plt.rcParams['animation.writer'] = 'html'
    plt.rcParams['animation.embed_limit'] = 100
    
    def rgba_to_rgb(img_rgba):
        img_rgb = Image.new("RGB", img_rgba.size, (255, 255, 255))
        img_rgb.paste(img_rgba, mask=img_rgba.split()[3]) 
        return img_rgb 
    
    def html_to_gif(html_file, gif_file, duration=0.5):
        path = html_file.replace(".html","_frames")
        images = [os.path.join(path,x) for x in sorted(os.listdir(path))]
        frames = [imageio.imread(x) for x in images]
        if frames[0].shape[-1]==4:
            frames = [np.array(rgba_to_rgb(Image.fromarray(x))) for x in frames]
        imageio.mimsave(gif_file, frames, 'gif', duration=duration)
        return gif_file
    
    cmap = [
    '#2E91E5',
    '#1CA71C',
    '#DA16FF',
    '#B68100',
    '#EB663B',
    '#00A08B',
    '#FC0080',
    '#6C7C32',
    '#862A16',
    '#620042',
    '#DA60CA',
    '#0D2A63']*100
    
    def getCoords(geom):
        if isinstance(geom,geo.MultiPolygon):
            return [np.array(g.exterior) for g in geom.geoms]
        elif isinstance(geom,geo.Polygon):
            return [np.array(geom.exterior)]
        elif isinstance(geom,geo.LineString):
            return [np.array(geom)]
        elif isinstance(geom,geo.MultiLineString):
            return [np.array(x) for x in list(geom.geoms)]
        else:
            raise Exception("geom must be one of [polygon,MultiPolygon,LineString,MultiLineString]!")
    
    #底图数据
    dfprovince = gpd.read_file("./data/dfprovince.geojson").set_crs("epsg:4326").to_crs("epsg:2343")
    dfnanhai = gpd.read_file("./data/dfnanhai.geojson").set_crs("epsg:4326").to_crs("epsg:2343")
    dfline9 =  dfnanhai[(dfnanhai["LENGTH"]>1.0)&(dfnanhai["LENGTH"]<2.0)]
    
    #散点数据
    dfpoints = gpd.read_file("./data/china_big_cities.geojson").set_crs("epsg:4326").to_crs("epsg:2343")
    dfpoints["point"] = dfpoints.representative_point()
    dfpoints = dfpoints.query("population>=5000000") 
    
    df = pd.DataFrame({"x":[pt.x for pt in dfpoints["point"]],
                      "y": [pt.y for pt in dfpoints["point"]],
                      "z":[x for x in dfpoints["population"]]})
    df.index = [x for x in dfpoints["city"]] 
    
    def bubble_map_dance(df,title = "中国超500万人口城市",
                         filename = None,
                         figsize = (8,6),dpi = 144,
                         duration = 0.5,
                         anotate_points = ["北京市","上海市","重庆市","赣州市","沈阳市"]):
    
        fig, ax_base =plt.subplots(figsize=figsize,dpi=dpi)
        ax_child=fig.add_axes([0.800,0.125,0.10,0.20])
        
        def plot_frame(i):
    
                ax_base.clear()
                ax_child.clear()
    
                #============================================================
                #绘制底图
                #============================================================
    
                #绘制省边界
                polygons = [getCoords(x) for x in dfprovince["geometry"]]
                for j,coords in enumerate(polygons):
                    for x in coords:
                        poly = plt.Polygon(x, fill=True, ec = "gray", fc = "white",alpha=0.5,linewidth=.8)
                        poly_child = plt.Polygon(x, fill=True, ec = "gray", fc = "white",alpha=0.5,linewidth=.8)
                        ax_base.add_patch(poly)
                        ax_child.add_patch(poly_child )
    
                #绘制九段线
                coords = [getCoords(x) for x in dfline9["geometry"]]
                lines = [y for x in coords for y in x ]
                for ln in lines:
                    x, y = np.transpose(ln)
                    line = plt.Line2D(x,y,color="gray",linestyle="-.",linewidth=1.5)
                    line_child = plt.Line2D(x,y,color="gray",linestyle="-.",linewidth=1.5)
                    ax_base.add_artist(line)
                    ax_child.add_artist(line_child)
    
    
    
                #设置spine格式
                for spine in['top','left',"bottom","right"]:
                    ax_base.spines[spine].set_color("none")
                    ax_child.spines[spine].set_alpha(0.5)
                ax_base.axis("off")
                
    
                #设置绘图范围
                bounds = dfprovince.total_bounds
                ax_base.set_xlim(bounds[0]-(bounds[2]-bounds[0])/10, bounds[2]+(bounds[2]-bounds[0])/10)
                ax_base.set_ylim(bounds[1]+(bounds[3]-bounds[1])/3.5, bounds[3]+(bounds[3]-bounds[1])/100)
    
                ax_child.set_xlim(bounds[2]-(bounds[2]-bounds[0])/2.5, bounds[2]-(bounds[2]-bounds[0])/20)
                ax_child.set_ylim(bounds[1]-(bounds[3]-bounds[1])/20, bounds[1]+(bounds[3]-bounds[1])/2)
    
                #移除坐标轴刻度
                ax_child.set_xticks([]);
                ax_child.set_yticks([]);
    
                #============================================================
                #绘制散点
                #============================================================
    
                k = i//3+1
                m = i%3
                text = "NO."+str(len(df)+1-k) 
    
                dfdata = df.iloc[:k,:].copy()
                dftmp = df.iloc[:k-1,:].copy()
    
                # 绘制散点图像
                if len(dftmp)>0:
                    ax_base.scatter(dftmp["x"],dftmp["y"],s = 100*dftmp["z"]/df["z"].mean(),
                           c = (cmap*100)[0:len(dftmp)],alpha = 0.3,zorder = 3)
                    ax_child.scatter(dftmp["x"],dftmp["y"],s = 100*dftmp["z"]/df["z"].mean(),
                           c = (cmap*100)[0:len(dftmp)],alpha = 0.3,zorder = 3)
    
                    # 添加注释文字
                    for i,p in enumerate(dftmp.index):
                        px,py,pz = dftmp.loc[p,["x","y","z"]].tolist() 
                        if p in anotate_points:
                            ax_base.annotate(p,xy = (px,py),  xycoords = "data",xytext = (-15,10),
                            fontsize = 10,fontweight = "bold",color = cmap[i], textcoords = "offset points")
                
                # 添加标题和排名序号
                #ax_base.set_title(title,color = "black",fontsize = 12)
                ax_base.text(0.5, 0.95, title, va="center", ha="center", 
                            size = 12,transform = ax_base.transAxes)
                ax_base.text(0.5, 0.5, text, va="center", ha="center", 
                             alpha=0.3, size = 50,transform = ax_base.transAxes)
    
                # 添加注意力动画
                if m==0:
                    px,py,pz = dfdata["x"][[-1]],dfdata["y"][[-1]],dfdata["z"][-1]
                    p = dfdata.index[-1]+":"+str(pz//10000)+"万"
                    ax_base.scatter(px,py,s = 800*pz/df["z"].mean(),
                       c = cmap[len(dfdata)-1:len(dfdata)],alpha = 0.5,zorder = 4)
                    ax_base.annotate(p,xy = (px,py),  xycoords = "data",
                            xytext = (-15,10),fontsize = 20,fontweight = "bold",
                            color = cmap[k-1], textcoords = "offset points",zorder = 5)
                    
                if m==1:
                    px,py,pz = dfdata["x"][[-1]],dfdata["y"][[-1]],dfdata["z"][-1]
                    p = dfdata.index[-1]+":"+str(pz//10000)+"万"
                    ax_base.scatter(px,py,s = 400*pz/df["z"].mean(),
                       c = cmap[len(dfdata)-1:len(dfdata)],alpha = 0.5,zorder = 4)
                    ax_base.annotate(p,xy = (px,py),  xycoords = "data",
                            xytext = (-15,10),fontsize = 15,fontweight = "bold",
                            color = cmap[k-1], textcoords = "offset points",zorder = 5)
    
                if m==2:
                    px,py,pz = dfdata["x"][[-1]],dfdata["y"][[-1]],dfdata["z"][-1]
                    p = dfdata.index[-1]+":"+str(pz//10000)+"万"
                    ax_base.scatter(px,py,s = 100*pz/df["z"].mean(),
                       c = cmap[len(dfdata)-1:len(dfdata)],alpha = 0.5,zorder = 4)
                    ax_base.annotate(p,xy = (px,py),  xycoords = "data",
                            xytext = (-15,10),fontsize = 10,fontweight = "bold",
                            color = cmap[k-1], textcoords = "offset points",zorder = 5)
                    
        my_animation = animation.FuncAnimation(fig,plot_frame,frames = range(0,3*len(df)),interval = int(duration*1000))
        
        if filename is None:
            try:
                from IPython.display import HTML
                HTML(my_animation.to_jshtml())
                return HTML(my_animation.to_jshtml())
            except ImportError:
                pass
        else:
            my_animation.save(filename)
            return filename
    
    html_file = "中国超500万人口城市.html"
    bubble_map_dance(df,filename = html_file)
    
    gif_file = html_file.replace(".html",".gif")
    html_to_gif(html_file,gif_file,duration=0.5)

收工。

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[9c8e4568015845797de85fe9f0e60114.gif]: /images/20220829/086fddda3ee84bb497c82ca79da32de0.png
[5810c220fa93b2c8ff8969217db545fa.png]: /images/20220829/f7d5552825da4b42a4136684ec8d4668.png
[97df7dc9e6fa8f5e7027a41eff7827aa.png]: /images/20220829/473c27d282df47f1bf9a5c4f23598bf0.png
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[c4f35e0c5853182ddd2bcd549c60db8e.png]: /images/20220829/b76fa3aa6cc64fbb86ca9de5649a5e8e.png