Specify the soupsieve dependency in a way that complies with

  PEP 508. Patch by Mike Nerone. [bug=1893696] 

2 files changed, 7 insertions, 5 deletions

diff --git a/CHANGELOG b/CHANGELOG
index c6babac..70c6f47 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,9 @@
   stack during tree building, when encountering a closing tag that had
   no matching opening tag. [bug=1880420]
 
+* Specify the soupsieve dependency in a way that complies with
+  PEP 508. Patch by Mike Nerone. [bug=1893696] 
+
 = 4.9.1 (20200517)
 
 * Added a keyword argument 'on_duplicate_attribute' to the
diff --git a/setup.py b/setup.py
index e8244ed..8e22ba6 100644
--- a/setup.py
+++ b/setup.py
@@ -7,10 +7,6 @@ import sys
 with open("README.md", "r") as fh:
     long_description = fh.read()
 
-install_requires=["soupsieve>1.2"]
-if sys.version_info.major == 2:
-    install_requires.append("soupsieve<2.0")
-    
 setup(
     name="beautifulsoup4",
     # NOTE: We can't import __version__ from bs4 because bs4/__init__.py is Python 2 code,
@@ -22,7 +18,10 @@ setup(
     url="http://www.crummy.com/software/BeautifulSoup/bs4/",
     download_url = "http://www.crummy.com/software/BeautifulSoup/bs4/download/",
     description="Screen-scraping library",
-    install_requires=install_requires,
+    install_requires=[
+        "soupsieve >1.2; python_version>='3.0'",
+        "soupsieve >1.2, <2.0; python_version<'3.0'",
+    ],
     long_description=long_description,
     long_description_content_type="text/markdown",
     license="MIT",