PYTHON 3：讀取文件並將座標映射到烏龜屏幕

Question

因此，我必須編寫一個程序，該程序讀取包含地震數據的csv文件，然後僅從文件中獲取緯度和經度，並將其映射到在Python龜屏幕3.

這是CSV file

我的程序：

import turtle 
def drawQuakes(): 
filename = input("Please enter the quake file: ") 
readfile = open(filename, "r") 
readlines = readfile.read() 

start = readlines.find("type") 
g = readlines[start] 
Type = g.split(",") 
tracy = turtle.Turtle() 
tracy.up() 
for points in Type: 
    print(points) 
    x = float(Type[1]) 
    y = float(Type[2]) 
    tracy.goto(x,y) 
    tracy.write(".") 
drawQuakes() 

我知道這個節目是相當容易的，但我不斷收到此錯誤：

x = float(Type[1])IndexError: list index out of range 

Answer 1

你沒有正確使用的文件，讓我們來分析一下：

readlines = readfile.read() 
# readlines is now the entire file contents 

start = readlines.find("type") 
# start is now 80 

g = readlines[start] 
# g is now 't' 

Type = g.split(",") 
# Type is now ['t'] 

tracy = turtle.Turtle() 
tracy.up() 
for points in Type: 
    print(points) 
    # points is 't' 

    x = float(Type[1]) 
    # IndexError: list index out of range 

    y = float(Type[2]) 
    tracy.goto(x,y) 
    tracy.write(".") 

我會用csv.DictReader：

import turtle 
import csv 

def drawQuakes(): 
    filename = input("Please enter the quake file: ") 

    tracy = turtle.Turtle() 
    tracy.up() 

    with open(filename, 'r') as csvfile: 
     reader = reader = csv.DictReader(csvfile) 
     for row in reader: 
      if row['type'] == 'earthquake': 
       x = float(row['latitude']) 
       y = float(row['longitude']) 
       tracy.goto(x,y) 
       tracy.write(".") 

drawQuakes()