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[lemuriformes] utility functions
author Jeff Hammel <k0scist@gmail.com>
date Sun, 10 Dec 2017 17:42:52 -0800
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1 #!/usr/bin/env python
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2
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3 """
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4 serialization
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5 """
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6
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7 import argparse
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8 import csv
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9 import json
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10 import sys
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11 from StringIO import StringIO
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12 from .cast import isstring
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13 from .cast import unify
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14
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15
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16 def dictlist2csv(list_of_dicts, header=None, fp=None):
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17 """
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18 convert a `list_of_dicts` to CSV
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19
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20 `fp` should be a file-like object or a path to a file
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21 that will be overwritten. If `fp` is not provided, a
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22 string will be returned
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23 """
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24
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25 if isstring(fp):
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26 with open(fp, 'w') as _fp:
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27 return dictlist2csv(list_of_dicts, _fp)
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28
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29 return_string = False
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30 if fp is None:
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31 return_string = True
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32 fp = StringIO()
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33
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34 # get the header
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35 if not list_of_dicts:
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36 return # XXX what about return_string? Good or bad?
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37 header = header or list_of_dicts[0].keys()
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38
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39 # instantiate a writer
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40 writer = csv.DictWriter(fp, fieldnames=header)
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41 writer.writeheader()
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42 for row in list_of_dicts:
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43 row = {key: unify(value)
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44 for key, value in row.items()}
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45 try:
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46 writer.writerow(row)
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47 except (UnicodeDecodeError, UnicodeEncodeError) as e:
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48 print (row )
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49 print(e)
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50 raise
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51
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52 if return_string:
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53 return fp.getvalue()
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54
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55
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56 def dump_json(_json):
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57 """general purpose JSON front-end"""
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58 return json.dumps(_json, indent=2, sort_keys=True)
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59
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60
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61 def append(filename, item):
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62 """append line-`item` to `filename`"""
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63
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64 with open(filename, 'a') as f:
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65 f.write('{}\n'.format(item))
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66
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67
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68 def main(args=sys.argv[1:]):
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69 """CLI"""
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70
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71 # parse command line
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72 description = "convert a list of dicts in JSON format to CSV"
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73 parser = argparse.ArgumentParser(description=description)
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74 parser.add_argument('input',
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75 type=argparse.FileType('r'),
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76 help="path to file containing a list of flat dicts")
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77 parser.add_argument('-o', '--output', dest='output',
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78 type=argparse.FileType('w'), default=sys.stdout,
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79 help="file to write the CSV to [DEFAULT: stdout]")
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80 options = parser.parse_args(args)
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81
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82 # parse input
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83 data = json.loads(options.input.read())
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84 assert type(data) == list
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85
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86 # write output
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87 dictlist2csv(data, options.output)
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88
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89
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90 if __name__ == '__main__':
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91 main()