simplegeo geojson Features to FeatureCollection from http://gis.stackexchange.com/a/16255

gistfile1.py

import sys

infile = sys.argv[1]
outfile = sys.argv[2]


## Prepare the input/output for read/write of files
fin = open(infile, 'r')
fout = open(outfile, 'w')


##Prepend the new file with approriate header info
fout.write('{"type":"FeatureCollection","features":[' + '\n')


## Read each line from the input and write to the output
for line in fin:
    ##write each line in the table, and replace carriage returns with "," + carriage return
    fout.write(line.replace("\n",",\n"))

##Append the new file with approriate footer info
fout.write(']}')

##Close the input and output files to release file locking
fin.close()
fout.close()