fix: solve bug in extracting date from pmc source (#9)

src/pymedx/article.py

@@ -285,19 +285,24 @@ def _extractPublicationDate(
         # Get the publication elements
         publication_date = xml_element.find(".//pub-date[@pub-type='epub']")
 
-        if not publication_date:  # Check this part
+        if publication_date is None:
             publication_date = xml_element.find(".//pub-date")
 
         if publication_date is not None:
             publication_year = getContent(publication_date, ".//year", None)
 
+            if not publication_year or publication_year is None:
+                return None
+
             publication_month = getContent(publication_date, ".//month", "1")
 
             publication_day = getContent(publication_date, ".//day", "1")
 
             # Construct a datetime object from the info
             date_str: str = (
-                f"{publication_year}/{publication_month}/{publication_day}"
+                f"{str(publication_year).strip()}/"
+                f"{str(publication_month).strip()}/"
+                f"{str(publication_day).strip()}"
             )
 
             return datetime.datetime.strptime(date_str, "%Y/%m/%d")

tests/test_pmc.py

@@ -1,7 +1,9 @@
 """Test PubMedCentral class."""
 
+import datetime
 
-from pymedx.api import PubMedCentral
+from lxml import etree as xml
+from pymedx.api import PubMedCentral, PubMedCentralArticle
 
 
 class TestPMC:
@@ -21,3 +23,33 @@ def test_query_results(self):
         assert len(listed) > 0
         assert len(listed[0].title) > 0
         assert len(listed[0].pmc_id) > 0
+
+    def test_extracting_date(self):
+        """Test date extraction."""
+        root = xml.Element("root")
+        date = xml.SubElement(root, "pub-date")
+        xml.SubElement(date, "year").text = "\n2024"
+        xml.SubElement(date, "month").text = "2\n"
+        xml.SubElement(date, "day").text = "9"
+
+        test_collector = PubMedCentralArticle()
+
+        result = test_collector._extractPublicationDate(root)
+        expected = datetime.datetime.strptime("2024/2/9", "%Y/%m/%d")
+
+        assert result == expected
+
+    def test_extracting_date_None(self):
+        """Test date extraction."""
+        root = xml.Element("root")
+        date = xml.SubElement(root, "pub-date")
+        xml.SubElement(date, "year").text = ""
+        xml.SubElement(date, "month").text = "2\n"
+        xml.SubElement(date, "day").text = "9"
+
+        test_collector = PubMedCentralArticle()
+
+        result = test_collector._extractPublicationDate(root)
+        expected = None
+
+        assert result == expected