Question

我正在尝试在python中生成Arizona的地图，打算使用方法setworldcoordinates（）而不是变换坐标。我正在编写一个代码来确定边界框但是我想出来了 ValueError: too many values to unpack在包含for x,y in state[POINTS]:

的行

我已将整个代码粘贴到底部的for循环中，导致错误。作为参考，导入的csv文件包含2列中的17行数据。我是编程的新手，我不确定我正在制作什么错误或如何解决它。

#Importing modules 
import csv
import turtle as t

# Retrieve AZ map coordinates from a csv file
az_coords = open('AZ_points_simple.csv', "r")   # open file
csvReader = csv.reader(az_coords)               # create reader object
header = csvReader.next()                       # gives back a list of each item in header
latIndex = header.index("Y")                    # access column headers needed from file
lonIndex = header.index("X")

# Make empty list for coordinates
coordList = []

# loop through the lines in the file and get each coordinate 
for row in csvReader:
    lat = row[latIndex]             # Y coordinate
    lon = row[lonIndex]             # X coordinate
    coordList.append([lat,lon])

# DATA MODEL
# All cities will have a name, 1+ points, and population count
NAME = 0
POINTS= 1
POP = 2

# Create state layer 
state = ["ARIZONA", [coordList], 7016270]

# Cities layer list 
# city = [name, [points], population]
cities = []

# add Phoenix
cities.append(["PHOENIX", [-112.09, 33.57], 1615017])
# add Tucson
cities.append(["TUCSON", [-110.87, 32.14], 530706])
# add Flagstaff 
cities.append(["FLAGSTAFF", [-111.62, 35.19], 71459])

# MAP SIZING 
map_width = 400
map_height = 300

# State bounding box 
# Use min/max functions to get bounding box 
minx = 180 
maxx = -180 
miny = 90
maxy = -90
for x,y in state[POINTS]:
    if x < minx: 
        minx = x
    elif x > maxx: 
        maxx = x
    if y < miny:
        miny = y 
    elif y > maxy:
        maxy = y`

Answer 1

变化：

state = ["ARIZONA", [coordList], 7016270]

为：

state = ["ARIZONA", coordList, 7016270]

coordList已经是x, y对的列表，请保持原样。

Python-解压缩的值太多（创建边界框）

1 个答案: