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HomeBackend DevelopmentPython TutorialHow to use pyshp to read and write shp files in python

    Installation

    pip install pyshp

    Introduction

    import shapefile

    Read

    sf=shapefile.Reader("{pathname} ",encoding='utf-8') # Only read

    shapes and shape

    shapes=sf.shapes() The return value is a list containing all the "geometry" in the file Data" object

    shape=sf.shape(0) Shape is the first "geometric data" object

    shapeType returns the collection type

    returns The data type attribute of the first object

        几何类型
        NULL = 0
        POINT = 1
        POLYLINE = 3
        POLYGON = 5
        MULTIPOINT = 8
        POINTZ = 11
        POLYLINEZ = 13
        POLYGONZ = 15
        MULTIPOINTZ = 18
        POINTM = 21
        POLYLINEM = 23
        POLYGONM = 25
        MULTIPOINTM = 28
        MULTIPATCH = 31
       print(shape.shapeType)

    bbox Returns the data range

    shape.bbox Returns the data range of the first collection object (x, y in the lower left corner coordinates and the x, y coordinates of the upper right corner)

    points All coordinate points

    shape.points Returns all coordinate points of the first collection object

    parts Returns the coordinates of the first point of the "block"

    shape.parts Returns the coordinates of the first point of each "block" of the first object

    records and record

    Get the attribute list

    records

    Get the attribute list, it is a function

    sf. records();

    The returned value is a list

    record
    Get a piece of data

    sf.record(0)
    The returned value is class

    shapeRecords

    Get record and shape at the same time

    # 同时读取geometry and records
    sf.shapeRecords()
    获取所有
    red=sf.shapeRecords()[0]  #获取第一条数据
    print(red.record)  #获取record
    print(red.shape)   #获取shape

    fields

    Get shp file attribute field

    print(sf.fields)
    [('DeletionFlag', 'C', 1, 0), ['OBJECTID', 'N', 9, 0], ['BSM', 'C', 12, 0], ['PXZQDM', 'C', 2, 0], ['PXZQMC', 'C', 50, 0]]

    Write

    import shapefile
    outshp = 'a.shp'
     
     landlist=[ '84.60212,45.03658,84.60794,45.03938,84.61473,45.04151,84.62442,45.04375,84.62727,45.03632,84.63939,45.0367,84.64906,45.03277,84.63886,45.02233',
        '84.58063,45.05523,84.57974,45.04717,84.59864,45.04792,84.60078,45.05523,84.58758,45.05473,84.58223,45.05523'
    ]
    def tramform(lat_lng):
        str =lat_lng
        str = str.split(',')
        arr = []
        for i in range(len(str) - 1):
            # 第一列,第二列作为经纬度(x,y)创建点
            if i % 2 == 0:
                arr.append([float(str[i]), float(str[i + 1])])
        return arr
    fileWrite = shapefile.Writer("create/1.shp",encoding='utf-8')  # 新建数据存放位置
    
    # shp文件属性字段 Fid,Shape会自动生成。
    fileWrite.field('landid')
    fileWrite.field('landName')
    
    for i in range(len(landlist)):
        # 第一步:塞入形状
        ## 这个形状指的就是那些点的集合
        ## 由于源码中要求的输入是列表,因此就算只塞入一个,也要套一个列表
        arr=[]
        arr=tramform(landlist[i])
        #[[84.60212, 45.03658], [84.60794, 45.03938], [84.61473, 45.04151], [84.62442, 45.04375], [84.62727, 45.03632], [84.63939, 45.0367], [84.64906, 45.03277], [84.63886, 45.02233]]
        #poly 写入面,点线面使用不同函数
        fileWrite.poly([arr])
    
        # 第二步:塞入属性值
        fileWrite.record(str(i), '地块')
    # 保存结束
    fileWrite.close()

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