Fix export to pandas dataframe (#15)

Add tests as well

setup.cfg

@@ -52,7 +52,7 @@ install_requires =
     biocutils>=0.1.2,<0.2.0
     biocframe>=0.5.3,<0.6.0
     numpy
-
+    ncls==0.0.68
 
 [options.packages.find]
 where = src
@@ -64,7 +64,7 @@ exclude =
 # `pip install IRanges[PDF]` like:
 # PDF = ReportLab; RXP
 optional =
-    ncls==0.0.68
+    numpy
 
 # Add here test requirements (semicolon/line-separated)
 testing =

src/iranges/IRanges.py

@@ -2082,7 +2082,7 @@ def to_pandas(self) -> "pandas.DataFrame":
 
         _starts = self._start
         _widths = self._width
-        _ends = self.get_end
+        _ends = self.get_end()
 
         output = pd.DataFrame({"starts": _starts, "widths": _widths, "ends": _ends})
 
@@ -2100,7 +2100,7 @@ def from_pandas(cls, input: "pandas.DataFrame") -> "IRanges":
 
         Args:
             input:
-                Input data. must contain columns 'start' and 'width'.
+                Input data must contain columns 'start' and 'width'.
 
         Returns:
             A ``IRanges`` object.

tests/test_IRanges_pandas.py

@@ -15,3 +15,12 @@ def test_pandas():
     assert (x.get_start() == np.array(df["start"])).all()
     assert (x.get_width() == np.array(df["width"])).all()
     assert isinstance(x.mcols, BiocFrame)
+
+
+def test_pandas_export():
+    x = IRanges([1, 2, 3, 4], [4, 5, 6, 7])
+
+    y = x.to_pandas()
+    assert y is not None
+    assert isinstance(y, pd.DataFrame)
+    assert set(y.columns.tolist()).issubset(["starts", "ends", "widths"])