From ce4ffc8f2207d20f4c49ed5f6fa97c067a2a269b Mon Sep 17 00:00:00 2001
From: Lianming Du <adullb@qq.com>
Date: Sat, 25 Nov 2023 16:34:47 +0800
Subject: [PATCH] fixed subsequence none

---
 docs/changelog.rst |  5 +++++
 setup.py           |  4 ++--
 src/sequence.c     | 10 ++++++----
 src/version.h      |  2 +-
 4 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/docs/changelog.rst b/docs/changelog.rst
index de85a29..cce5f58 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+Version 2.0.2 (2023-11-25)
+--------------------------
+
+- Fixed subsequence return None error
+
 Version 2.0.1 (2023-09-18)
 --------------------------
 
diff --git a/setup.py b/setup.py
index a7d47e2..7f7a26c 100644
--- a/setup.py
+++ b/setup.py
@@ -75,7 +75,7 @@ def prepare_indexed_gzip():
     ])
 
     if sys.platform.startswith('linux'):
-        link_args.extend(['-lz', '-lsqlite3'])
+        link_args.extend(['-lsqlite3'])
         comp_args.extend([
             '-D_LFS64_LARGEFILE',
             '-D_LARGEFILE64_SOURCE',
@@ -85,9 +85,9 @@ def prepare_indexed_gzip():
         comp_args.append('-DHAVE_UNISTD_H')
 
 if not sys.platform.startswith('linux'):
-    prepare_zlib()
     prepare_sqlite3()
 
+prepare_zlib()
 prepare_indexed_gzip()
 
 extension = Extension('pyfastx',
diff --git a/src/sequence.c b/src/sequence.c
index 834a933..7365ae5 100644
--- a/src/sequence.c
+++ b/src/sequence.c
@@ -457,16 +457,18 @@ PyObject *pyfastx_sequence_subscript(pyfastx_Sequence* self, PyObject* item){
 		//	return NULL;
 		//}
 
-		if (slice_len <= 0) {
-			Py_RETURN_NONE;
-		}
+		//if (slice_len <= 0) {
+		//	Py_RETURN_NONE;
+		//}
 
 		if (slice_step == 0) {
 			PyErr_SetString(PyExc_ValueError, "slice step cannot be zero");
+			return NULL;
 		}
 
 		if (slice_step != 1) {
-			Py_RETURN_NONE;
+			PyErr_SetString(PyExc_ValueError, "slice step cannot > 1");
+			return NULL;
 		}
 
 		//create a new sequence
diff --git a/src/version.h b/src/version.h
index 91e652f..a70219c 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1,2 +1,2 @@
-#define PYFASTX_VERSION "2.0.1"
+#define PYFASTX_VERSION "2.0.2"
 #define ZRAN_VERSION "1.7.0"
\ No newline at end of file