Created
December 1, 2015 22:01
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Convert a .json file into a CSV file, flattening any embedded objects and arrays
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| #!/usr/bin/evn python | |
| import csv | |
| import json | |
| import sys | |
| from sets import Set | |
| def main(): | |
| """ | |
| Convert a .json file into a CSV file, flattening any embedded objects and | |
| arrays | |
| """ | |
| if len(sys.argv) != 3: | |
| print('USAGE: python flattenIn2csv.py JSON_FILE KEY') | |
| sys.exit(1) | |
| in_file = sys.argv[1] | |
| key = sys.argv[2] | |
| data = {} | |
| with open(in_file) as in_f: | |
| data = json.loads(in_f.read()) | |
| keys = Set() | |
| flattened = [] | |
| for row in data[key]: | |
| flat = flattenDict(row) | |
| flattened.append(flat) | |
| keys.update(flat.keys()) | |
| csv_writer = csv.DictWriter(sys.stdout, keys) | |
| csv_writer.writeheader() | |
| for row in flattened: | |
| csv_writer.writerow(row) | |
| def flattenDict(d, result=None): | |
| """ | |
| https://gist.github.com/higarmi/6708779 | |
| """ | |
| if result is None: | |
| result = {} | |
| for key in d: | |
| value = d[key] | |
| if isinstance(value, dict): | |
| value1 = {} | |
| for keyIn in value: | |
| value1[".".join([key,keyIn])]=value[keyIn] | |
| flattenDict(value1, result) | |
| elif isinstance(value, (list, tuple)): | |
| for indexB, element in enumerate(value): | |
| if isinstance(element, dict): | |
| value1 = {} | |
| index = 0 | |
| for keyIn in element: | |
| newkey = ".".join([key,keyIn]) | |
| value1[".".join([key,keyIn])]=value[indexB][keyIn] | |
| index += 1 | |
| for keyA in value1: | |
| flattenDict(value1, result) | |
| else: | |
| result[key]=value | |
| return result | |
| if __name__ == '__main__': | |
| main() |
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it is working but , incase if there is a dictionary inside a list then previous keys were getting overwritten by last key .
"records":[
{"_app_type":"PREGNANT", /* getting overwritten by below entry */
"_data_type":"DAYS_POST"
},
{"_app_type":"VISION",
"_data_type":"DAYS_PRE"
}]
only _app_type":"VISION is being shown up not the firs one in above case