add release script

release.py

+import re
+import os
+
+
+def bump_version():
+    with open("setup.py") as f:
+        s = f.read()
+    m = re.search(r'version="(.*)\.(.*)\.(.*)",', s)
+    v1, v2, v3 = m.groups()
+    oldv = "{}.{}.{}".format(v1, v2, v3)
+    newv = "{}.{}.{}".format(v1, v2, str(int(v3) + 1))
+    print("Current version is: {}, write new version, ctrl-c to exit".format(oldv))
+    print(newv, end="")
+    ans = input()
+    if ans:
+        newv = ans 
+    s = s.replace(oldv, newv)
+    with open("setup.py", "w") as f:
+        f.write(s)
+    return newv
+
+
+def release():
+    v = bump_version()
+    os.system("git add setup.py")
+    os.system("git commit -m 'new release'")
+    os.system("git tag {}".format(v))
+    os.system("git push --tags")
+    os.system("python setup.py sdist upload")
+
+
+if __name__ == "__main__":
+    release()