本文整理汇总了Python中odps.df.DataFrame.tail方法的典型用法代码示例。如果您正苦于以下问题：Python DataFrame.tail方法的具体用法？Python DataFrame.tail怎么用？Python DataFrame.tail使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类odps.df.DataFrame的用法示例。
在下文中一共展示了DataFrame.tail方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: testHeadAndTail
# 需要导入模块: from odps.df import DataFrame [as 别名]
# 或者: from odps.df.DataFrame import tail [as 别名]
def testHeadAndTail(self):
df = DataFrame(self.table)
self.assertEqual(1, len(df.head(1)))
self.assertEqual(2, len(df.head(2)))
self.assertEqual([3, 'name3'], list(df.tail(1)[0]))
r = df[df.name == 'name2'].head(1)
self.assertEqual(1, len(r))
self.assertEqual([2, 'name2'], list(r[0]))示例2: testHeadAndTail
# 需要导入模块: from odps.df import DataFrame [as 别名]
# 或者: from odps.df.DataFrame import tail [as 别名]
def testHeadAndTail(self):
df = DataFrame(self.table)
self.assertEqual(1, len(df.head(1)))
self.assertEqual(2, len(df.head(2)))
self.assertEqual([3, 'name3'], list(df.tail(1)[0]))
r = df[df.name == 'name2'].head(1)
self.assertEqual(1, len(r))
self.assertEqual([2, 'name2'], list(r[0]))
self.assertRaises(NotImplementedError, lambda: df[df.name == 'name2'].tail(1))示例3: Test
# 需要导入模块: from odps.df import DataFrame [as 别名]
# 或者: from odps.df.DataFrame import tail [as 别名]
#.........这里部分代码省略.........
table = df._cache_data
self.assertEqual(len(df.execute()), len(expected))
self.assertIs(df._cache_data, table)
df4 = df[df.id_x < 3].count()
result = self.engine.execute(df4)
self.assertEqual(result, 2)
self.assertEqual(df4._cache_data, 2)
def testUseCache(self):
df = self.odps_df[self.odps_df['name'] == 'name1']
self.assertEqual(len(df.head(10)), 2)
df._cache_data.drop()
self.assertRaises(ODPSError, lambda: self.engine.execute(df['name', 'id']))
def plot(**_):
pass
self.assertRaises(ODPSError, lambda: df.plot(x='id', plot_func=plot))
def testHeadAndTail(self):
res = self.odps_df.head(2)
self.assertEqual(len(res), 2)
df = self.odps_df[self.odps_df['name'] == 'name1']
res = df.head(1)
self.assertEqual(len(res), 1)
self.assertIsNotNone(df._cache_data)
res = self.odps_df.tail(2)
self.assertEqual(len(res), 2)
self.assertTrue(all(it > 1 for it in res.values['id']))
self.assertEqual(len(self.odps_df.name.head(2)), 2)
self.assertEqual(len(self.odps_df.name.tail(2)), 2)
res = self.pd_df.head(1)
self.assertEqual(len(res), 1)
df = self.pd_df[self.pd_df['name'] == 'name1']
res = df.head(1)
self.assertEqual(len(res), 1)
self.assertIsNotNone(df._cache_data)
res = self.pd_df.tail(1)
self.assertEqual(len(res), 1)
self.assertEqual(res.values['id'][0], 6)
self.assertEqual(len(self.pd_df.name.head(1)), 1)
self.assertEqual(len(self.pd_df.name.tail(1)), 1)
def testMapReduceWithResource(self):
pd_df2 = self.odps_df.to_pandas(wrap=True)
@output(['name', 'id'], ['string', 'int'])
def reducer(resources):
d = dict()
for r in resources[0]:
if r.name in d:
d[r.name] += r.id
else:
d[r.name] = r.id示例4: Test
# 需要导入模块: from odps.df import DataFrame [as 别名]
# 或者: from odps.df.DataFrame import tail [as 别名]
#.........这里部分代码省略.........
"kv_k2",
"kv_k3",
"kv_k5",
"kv_k7",
"kv_k9",
"kv2_1",
"kv2_2",
"kv2_3",
"kv2_4",
"kv2_5",
]
expected = [
["name1", 1.0, 3.0, None, 10.0, None, None, 5.0, 1.0, 7.0, None, None],
["name1", None, None, None, None, None, None, None, None, 1.0, 2.0, None],
["name1", 7.1, None, None, None, 8.2, None, 1.0, None, None, None, 6.0],
["name2", None, 1.2, 1.5, None, None, None, None, None, None, None, None],
["name2", None, 1.0, None, None, None, 1.1, None, None, None, 2.0, None],
]
self.assertListEqual([c.name for c in res.columns], expected_cols)
self.assertEqual(result, expected)
finally:
table.drop()
def testHeadAndTail(self):
res = self.odps_df.head(2)
self.assertEqual(len(res), 2)
df = self.odps_df[self.odps_df["name"] == "name1"]
res = df.head(1)
self.assertEqual(len(res), 1)
self.assertIsNotNone(df._cache_data)
res = self.odps_df.tail(2)
self.assertEqual(len(res), 2)
self.assertTrue(all(it > 1 for it in res.values["id"]))
self.assertEqual(len(self.odps_df.name.head(2)), 2)
self.assertEqual(len(self.odps_df.name.tail(2)), 2)
res = self.pd_df.head(1)
self.assertEqual(len(res), 1)
df = self.pd_df[self.pd_df["name"] == "name1"]
res = df.head(1)
self.assertEqual(len(res), 1)
self.assertIsNotNone(df._cache_data)
res = self.pd_df.tail(1)
self.assertEqual(len(res), 1)
self.assertEqual(res.values["id"][0], 6)
self.assertEqual(len(self.pd_df.name.head(1)), 1)
self.assertEqual(len(self.pd_df.name.tail(1)), 1)
class TunnelOnlyODPSEngine(ODPSEngine):
def execute(self, expr, **kw):
expr = self._pre_process(expr)
head = kw.get("head")
return self._handle_cases(expr, head=head)
engine = MixedEngine(self.odps)
engine._odpssql_engine = TunnelOnlyODPSEngine(self.odps, global_optimize=False)
res = engine.execute(self.odps_df["id"], head=3)
self.assertIsNotNone(res)