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annotate globalneighbors/read.py @ 24:40a9850076a4

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author Jeff Hammel <k0scist@gmail.com>
date Mon, 04 Sep 2017 14:54:38 -0700
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1 """
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2 I/O
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3 """
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4
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5 import csv
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6 import sys
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7 from .schema import cast_row
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8 from .schema import types
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9
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10 # TSV notes for python `csv` library:
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11 # https://stackoverflow.com/questions/15063936/csv-error-field-larger-than-field-limit-131072
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13 string = (str, basestring)
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16 def read_tsv_generator(f):
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17 """read tab-separated values from file `f` into memory"""
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18
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19 reader = csv.reader(f,
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20 delimiter='\t',
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21 quoting=csv.QUOTE_NONE)
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22 for row in reader:
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23 yield row
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25 def read_tsv(f):
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26 if isinstance(f, string):
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27 with open(f) as f_:
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28 return read_tsv(f_)
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30 return [row for row in read_tsv_generator(f)]
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33 def read_cities(f, fields=None, types=types):
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34 """read and cast cities into a form we want"""
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35
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36 for index, row in enumerate(read_tsv_generator(f)):
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37 try:
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38 cast = cast_row(row, types=types)
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39 except AssertionError:
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40 sys.stderr.write("Error, row {}\n{}\n".format(index, row))
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41 raise
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42 if fields:
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43 cast = {key: value for key, value in cast.items()
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44 if key in fields}
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45 yield cast
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48 def read_city_list(f, fields=None, types=types):
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49 """read cities as a list"""
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50
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51 if isinstance(f, string):
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52 with open(f) as f_:
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53 return read_city_list(f_, fields=fields, types=types)
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55 return [city for city in
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56 read_cities(f, fields=fields, types=types)]