Fix pybigtools rest field

Author: jackh726

pybigtools/src/lib.rs

@@ -2172,7 +2172,7 @@ impl BigBedWrite {
                                         .extract(py)
                                         .unwrap();
                                     let rest: String = tuple
-                                        .get_item(0)
+                                        .get_item(3)
                                         .unwrap()
                                         .downcast::<PyString>()?
                                         .to_str()

pybigtools/tests/test_bigwig.py

@@ -72,6 +72,21 @@ def genintervals():
         assert a[1] == b[2]
         assert math.isclose(a[2], b[3], abs_tol=0.00001)
 
+def test_bigbed_write(tmpdir):
+    f = pybigtools.open(os.path.join(tmpdir, "test.bigBed"), "w")
+    f.write(
+        {"chr1": 1000, "chr2": 1000}, 
+        [
+            ("chr1", 0, 100, "foo\tbar\t3"), 
+            ("chr2", 100, 200, "xxx\tyyy\t1.0"),
+            ("chr2", 200, 300, "zzz\twww\t1.0")
+        ]
+    )
+    f.close()
+
+    f = pybigtools.open(os.path.join(tmpdir, "test.bigBed"))
+    records = list(f.records("chr2"))
+    assert records[0][2] == 'xxx'
 
 # TODO: bigWigAverageOverBed
 # TODO: bigWigMerge