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Reformatting lat/longs in a csv file

sara_bellum asked
Last Modified: 2012-05-05
I have a csv file with a list of stations and station parameters in each row, and I want to change the lat/long format from this:  70 43.311 N to this: N 70 43.311
I took a stab at it, but it would take me a very long time to figure out how this might work. Pls point me in the right direction, thanks!
import csv 
fin = open('weatherInfo.csv', 'rb')  # read binary
source = csv.reader(fin, quoting=csv.QUOTE_NONNUMERIC)    # quoting argument
fout = open('newWeather.csv', 'wb') # write binary
dest = csv.writer(fout, quoting=csv.QUOTE_NONNUMERIC)
index = 1 # leave the header out of this
lat = "N"
lon = "W"
for i, row in enumerate(source):
    if lat in row[4]:
        str = row[4:]
        str[:-1]     #Truncate the N from the end of each latitude, ex 70 43.311 N
        str.insert(0, lat) #Insert the N back into the beginning, ex N 70 43.311
        print row[4]  #Just to check the output
    if lon in row[5]:  
        # repeat the above steps for longitudes
        dest.writerow(row) # Write the results to the output file

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