From 980437050ef355905fe026c1a5d0e2e8e32fabd0 Mon Sep 17 00:00:00 2001
From: navrkald <navrkald@gmail.com>
Date: Tue, 16 Aug 2022 13:42:00 +0200
Subject: [PATCH 1/3] Fixes #920. Don't replace unserscores with hyphens in
 distribution name.

---
 tests/test_package.py | 1 +
 twine/package.py      | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/tests/test_package.py b/tests/test_package.py
index 0b883da3..9ac47fd8 100644
--- a/tests/test_package.py
+++ b/tests/test_package.py
@@ -121,6 +121,7 @@ def test_package_signed_name_is_correct():
         (string.digits, string.digits),
         (string.punctuation, "-.-"),
         ("mosaik.SimConfig", "mosaik.SimConfig"),
+        ("package_name", "package_name"),
         ("mosaik$$$$.SimConfig", "mosaik-.SimConfig"),
     ],
 )
diff --git a/twine/package.py b/twine/package.py
index 3ca074fe..7caad349 100644
--- a/twine/package.py
+++ b/twine/package.py
@@ -51,12 +51,12 @@
 def _safe_name(name: str) -> str:
     """Convert an arbitrary string to a standard distribution name.
 
-    Any runs of non-alphanumeric/. characters are replaced with a single '-'.
+    Any runs of non-alphanumeric/./_ characters are replaced with a single '-'.
 
     Copied from pkg_resources.safe_name for compatibility with warehouse.
     See https://github.com/pypa/twine/issues/743.
     """
-    return re.sub("[^A-Za-z0-9.]+", "-", name)
+    return re.sub("[^A-Za-z0-9._]+", "-", name)
 
 
 class PackageFile:

From e4110305e2becb939b7775f4ee772bc67c00e398 Mon Sep 17 00:00:00 2001
From: navrkald <navrkald@gmail.com>
Date: Tue, 16 Aug 2022 14:18:13 +0200
Subject: [PATCH 2/3] Fix the tests.

---
 tests/test_package.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tests/test_package.py b/tests/test_package.py
index 9ac47fd8..9c5e4f46 100644
--- a/tests/test_package.py
+++ b/tests/test_package.py
@@ -119,9 +119,8 @@ def test_package_signed_name_is_correct():
     [
         (string.ascii_letters, string.ascii_letters),
         (string.digits, string.digits),
-        (string.punctuation, "-.-"),
-        ("mosaik.SimConfig", "mosaik.SimConfig"),
-        ("package_name", "package_name"),
+        (string.punctuation, "-.-_-"),
+        ("mosaik._SimConfig", "mosaik._SimConfig"),
         ("mosaik$$$$.SimConfig", "mosaik-.SimConfig"),
     ],
 )

From ab736026adfb0a1281ad0a62aeaabf495dc20fcf Mon Sep 17 00:00:00 2001
From: navrkald <navrkald@gmail.com>
Date: Tue, 16 Aug 2022 14:21:57 +0200
Subject: [PATCH 3/3] doc: #901 - Added change log.

---
 changelog/901.bugfix.rst | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog/901.bugfix.rst

diff --git a/changelog/901.bugfix.rst b/changelog/901.bugfix.rst
new file mode 100644
index 00000000..cfd7e81b
--- /dev/null
+++ b/changelog/901.bugfix.rst
@@ -0,0 +1 @@
+Fixed replacing underscores by hyphens in package names.
\ No newline at end of file