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TST: tuple and namedtuple multiindex tests for read_csv #21994

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Jul 25, 2018
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TST: tuple and namedtuple multiindex tests for read_csv #21994

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50 changes: 50 additions & 0 deletions pandas/tests/io/parser/header.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@
during parsing for all of the parsers defined in parsers.py
"""

from collections import namedtuple

import pytest

import numpy as np
Expand Down Expand Up @@ -149,6 +151,22 @@ def test_header_multiindex_common_format(self):
result = self.read_csv(StringIO(data), header=[0, 1], index_col=0)
tm.assert_frame_equal(df, result)

# to_csv, tuples
result = self.read_csv(StringIO(data), skiprows=3,
names=[('a', 'q'), ('a', 'r'), ('a', 's'),
('b', 't'), ('c', 'u'), ('c', 'v')],
index_col=0)
tm.assert_frame_equal(df, result)

# to_csv, namedtuples
TestTuple = namedtuple('names', ['first', 'second'])
result = self.read_csv(
StringIO(data), skiprows=3, index_col=0,
names=[TestTuple('a', 'q'), TestTuple('a', 'r'),
TestTuple('a', 's'), TestTuple('b', 't'),
TestTuple('c', 'u'), TestTuple('c', 'v')])
tm.assert_frame_equal(df, result)

# common
data = """,a,a,a,b,c,c
,q,r,s,t,u,v
Expand All @@ -158,6 +176,22 @@ def test_header_multiindex_common_format(self):
result = self.read_csv(StringIO(data), header=[0, 1], index_col=0)
tm.assert_frame_equal(df, result)

# common, tuples
result = self.read_csv(StringIO(data), skiprows=2,
names=[('a', 'q'), ('a', 'r'), ('a', 's'),
('b', 't'), ('c', 'u'), ('c', 'v')],
index_col=0)
tm.assert_frame_equal(df, result)

# common, namedtuples
TestTuple = namedtuple('names', ['first', 'second'])
result = self.read_csv(
StringIO(data), skiprows=2, index_col=0,
names=[TestTuple('a', 'q'), TestTuple('a', 'r'),
TestTuple('a', 's'), TestTuple('b', 't'),
TestTuple('c', 'u'), TestTuple('c', 'v')])
tm.assert_frame_equal(df, result)

# common, no index_col
data = """a,a,a,b,c,c
q,r,s,t,u,v
Expand All @@ -167,6 +201,22 @@ def test_header_multiindex_common_format(self):
result = self.read_csv(StringIO(data), header=[0, 1], index_col=None)
tm.assert_frame_equal(df.reset_index(drop=True), result)

# common, no index_col, tuples
result = self.read_csv(StringIO(data), skiprows=2,
names=[('a', 'q'), ('a', 'r'), ('a', 's'),
('b', 't'), ('c', 'u'), ('c', 'v')],
index_col=None)
tm.assert_frame_equal(df.reset_index(drop=True), result)

# common, no index_col, namedtuples
TestTuple = namedtuple('names', ['first', 'second'])
result = self.read_csv(
StringIO(data), skiprows=2, index_col=None,
names=[TestTuple('a', 'q'), TestTuple('a', 'r'),
TestTuple('a', 's'), TestTuple('b', 't'),
TestTuple('c', 'u'), TestTuple('c', 'v')])
tm.assert_frame_equal(df.reset_index(drop=True), result)

# malformed case 1
expected = DataFrame(np.array(
[[2, 3, 4, 5, 6], [8, 9, 10, 11, 12]], dtype='int64'),
Expand Down