Make releasedata.Product usable in 'with' expression (#294)

This way the writing of the JSON file is handled automatically if the update does not fail.
It pave the way to further global improvements, such as a better error handling.

src/eks.py

@@ -13,23 +13,21 @@ URLS = [
     "https://docs.aws.amazon.com/eks/latest/userguide/platform-versions.html",
 ]
 
-product = releasedata.Product("eks")
-for version_list in http.fetch_urls(URLS):
-    version_list_soup = BeautifulSoup(version_list.text, features="html5lib")
-    for tr in version_list_soup.select("#main-col-body")[0].findAll("tr"):
-        cells = tr.findAll("td")
-        if not cells:
-            continue
+with releasedata.ProductData("eks") as product_data:
+    for version_list in http.fetch_urls(URLS):
+        version_list_soup = BeautifulSoup(version_list.text, features="html5lib")
+        for tr in version_list_soup.select("#main-col-body")[0].findAll("tr"):
+            cells = tr.findAll("td")
+            if not cells:
+                continue
 
-        k8s_version = cells[0].text.strip()
-        eks_version = cells[1].text.strip()
-        date_str = cells[-1].text.strip()
+            k8s_version = cells[0].text.strip()
+            eks_version = cells[1].text.strip()
+            date_str = cells[-1].text.strip()
 
-        k8s_version_match = endoflife.DEFAULT_VERSION_PATTERN.match(k8s_version)
-        if k8s_version_match:
-            date = dates.parse_date(date_str)
-            # K8S patch version is not kept to match versions on https://github.com/aws/eks-distro/tags.
-            version = f"{k8s_version_match.group('major')}.{k8s_version_match.group('minor')}-{eks_version.replace('.', '-')}"
-            product.declare_version(version, date)
-
-product.write()
+            k8s_version_match = endoflife.DEFAULT_VERSION_PATTERN.match(k8s_version)
+            if k8s_version_match:
+                date = dates.parse_date(date_str)
+                # K8S patch version is not kept to match versions on https://github.com/aws/eks-distro/tags.
+                version = f"{k8s_version_match.group('major')}.{k8s_version_match.group('minor')}-{eks_version.replace('.', '-')}"
+                product_data.declare_version(version, date)