78 lines
2 KiB
Python
78 lines
2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Tests that dialects are properly handled during parsing
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for all of the parsers defined in parsers.py
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"""
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import csv
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from pandas import DataFrame
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from pandas.compat import StringIO
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from pandas.errors import ParserWarning
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import pandas.util.testing as tm
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class DialectTests(object):
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def test_dialect(self):
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data = """\
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label1,label2,label3
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index1,"a,c,e
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index2,b,d,f
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"""
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dia = csv.excel()
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dia.quoting = csv.QUOTE_NONE
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with tm.assert_produces_warning(ParserWarning):
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df = self.read_csv(StringIO(data), dialect=dia)
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data = '''\
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label1,label2,label3
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index1,a,c,e
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index2,b,d,f
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'''
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exp = self.read_csv(StringIO(data))
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exp.replace('a', '"a', inplace=True)
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tm.assert_frame_equal(df, exp)
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def test_dialect_str(self):
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data = """\
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fruit:vegetable
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apple:brocolli
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pear:tomato
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"""
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exp = DataFrame({
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'fruit': ['apple', 'pear'],
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'vegetable': ['brocolli', 'tomato']
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})
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csv.register_dialect('mydialect', delimiter=':')
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with tm.assert_produces_warning(ParserWarning):
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df = self.read_csv(StringIO(data), dialect='mydialect')
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tm.assert_frame_equal(df, exp)
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csv.unregister_dialect('mydialect')
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def test_invalid_dialect(self):
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class InvalidDialect(object):
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pass
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data = 'a\n1'
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msg = 'Invalid dialect'
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with tm.assert_raises_regex(ValueError, msg):
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self.read_csv(StringIO(data), dialect=InvalidDialect)
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def test_dialect_conflict(self):
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data = 'a,b\n1,2'
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dialect = 'excel'
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exp = DataFrame({'a': [1], 'b': [2]})
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with tm.assert_produces_warning(None):
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df = self.read_csv(StringIO(data), delimiter=',', dialect=dialect)
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tm.assert_frame_equal(df, exp)
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with tm.assert_produces_warning(ParserWarning):
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df = self.read_csv(StringIO(data), delimiter='.', dialect=dialect)
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tm.assert_frame_equal(df, exp)
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