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annotate lemuriformes/columns.py @ 9:b69efcf85807

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[module] add columns
author Jeff Hammel <k0scist@gmail.com>
date Sun, 10 Dec 2017 13:56:30 -0800
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1 """
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2 Load a CSV file by columns
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3 """
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4
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5
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6 import csv
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7 from .decorators import fileobj
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8
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9
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10 @fileobj
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11 def read_columns(fp, type=dict):
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12 """read columns from CSV `fp` as `type`"""
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13
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14 reader = csv.reader(fp)
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15 columns = None
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16
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17 for row in reader:
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18
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19 if columns is None:
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20 # read the header
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21 header = row
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22
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23 # make a return value
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24 columns = type([(key, []) for key in header])
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25 continue
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26
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27 for key, value in zip(header, row):
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28 columns[key].append(value)
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29
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30 return columns