50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
![]() |
import pytest
|
||
|
|
||
|
from pandas import Series, Timedelta, Timestamp, date_range
|
||
|
|
||
|
|
||
|
class TestItem:
|
||
|
def test_item(self):
|
||
|
ser = Series([1])
|
||
|
result = ser.item()
|
||
|
assert result == 1
|
||
|
assert result == ser.iloc[0]
|
||
|
assert isinstance(result, int) # i.e. not np.int64
|
||
|
|
||
|
ser = Series([0.5], index=[3])
|
||
|
result = ser.item()
|
||
|
assert isinstance(result, float)
|
||
|
assert result == 0.5
|
||
|
|
||
|
ser = Series([1, 2])
|
||
|
msg = "can only convert an array of size 1"
|
||
|
with pytest.raises(ValueError, match=msg):
|
||
|
ser.item()
|
||
|
|
||
|
dti = date_range("2016-01-01", periods=2)
|
||
|
with pytest.raises(ValueError, match=msg):
|
||
|
dti.item()
|
||
|
with pytest.raises(ValueError, match=msg):
|
||
|
Series(dti).item()
|
||
|
|
||
|
val = dti[:1].item()
|
||
|
assert isinstance(val, Timestamp)
|
||
|
val = Series(dti)[:1].item()
|
||
|
assert isinstance(val, Timestamp)
|
||
|
|
||
|
tdi = dti - dti
|
||
|
with pytest.raises(ValueError, match=msg):
|
||
|
tdi.item()
|
||
|
with pytest.raises(ValueError, match=msg):
|
||
|
Series(tdi).item()
|
||
|
|
||
|
val = tdi[:1].item()
|
||
|
assert isinstance(val, Timedelta)
|
||
|
val = Series(tdi)[:1].item()
|
||
|
assert isinstance(val, Timedelta)
|
||
|
|
||
|
# Case where ser[0] would not work
|
||
|
ser = Series(dti, index=[5, 6])
|
||
|
val = ser[:1].item()
|
||
|
assert val == dti[0]
|