Python错误-IndexError：列表索引超出范围

Question

I am learning python so this might sound simple, I am trying to run the code below but I keep getting the error message shown, any thoughts on what could be causing it?

from geopy import geocoders
import csv

g_api_key = 'my_google_api_key'
g = geocoders.GoogleV3(g_api_key)

costco = csv.reader (open('costcolimited.csv'), delimiter = ',')

# Print header
print "Address, City, State, Zip Code, Latitude, Longitude"
for row in costco:
   full_addy = row[1]+ "," + row[2]+ "," + row[3] + "," + row[4]
   place, (lat,lng) = list (g.geocode(full_addy, exactly_one=FALSE))[0]
   full_addy + "," + str(lat) + "," + str(lng)

The error I am getting

Traceback (most recent call last):
File "C:\Python27\geocodelocations.py", line 12, in <module>
full_addy = row[1]+ "," + row[2]+ "," + row[3] + "," + row[4]
IndexError: list index out of range

Answer 1

The error is caused by referring element out of list range. From your code, it is probably because you start counting element from 1 . Remember that in python list, index starts from 0 . If this is your situation, then shift indexes in

full_addy = row[1]+ "," + row[2]+ "," + row[3] + "," + row[4]

to

full_addy = row[0]+ "," + row[1]+ "," + row[2] + "," + row[3]

Otherwise, check your data structure and make sure it is matched with your code.

Thanks

Answer 2

First of all make sure your CSV file has four columns. Try checking if len(row) >= 4 . If it contains you can go on with your code, but the first item in a Python list is referenced by 0 index.

Try something like this:

for row in costco:
   if len(row) < 4:
          print "Invalid file!"
          break
   full_addy = row[0]+ "," + row[1]+ "," + row[2] + "," + row[3]
   place, (lat,lng) = list (g.geocode(full_addy, exactly_one=FALSE))[0]
   full_addy + "," + str(lat) + "," + str(lng)