diff --git a/cd.sh b/cd.sh
index a5aee1a..b64ce20 100644
--- a/cd.sh
+++ b/cd.sh
@@ -573,15 +573,19 @@ ${CD_PYTHON_PACKAGES}
 cd_write_python_module () {
     cd_step "Write Python module"
     cd_write "${CD_PYTHON_PACKAGES}/env.py" "\
+$(cd_echo CD_OS_ID CD_OS_VERSION)
+
 STEP = ${CD_STEP}
 
 
-$(cd_echo CD_OS_ID CD_OS_VERSION)
+def open(*arguments):
+    print('${CD_OPEN}', end=str())
+    print(*arguments, flush=True)
 
 
-$(cd_echo CD_OPEN CD_SHUT)
-
-$(cd_echo CD_HORIZONTAL)
+def shut(*arguments):
+    print('${CD_SHUT}', end=str())
+    print(*arguments, flush=True)
 
 
 def split():
@@ -611,18 +615,11 @@ ${CD_GIT_CHILD}
 
 # functions
 
-cd_box_open () {
-    echo "${CD_OPEN}${@}"
-}
-cd_box_shut () {
-    echo "${CD_SHUT}${@}"
-}
-
 cd_cat () {
     if [ -f "${1}" ] ; then
-        cd_box_open "${1}"
+        cd_open "${1}"
         cat "${1}" || exit
-        cd_box_shut "${1}"
+        cd_shut "${1}"
     fi
 }
 
@@ -672,9 +669,9 @@ local command="${1}"
 
 cd_ls () {
     if [ -d "${1}" ] ; then
-        cd_box_open "${1}"
+        cd_open "${1}"
         ls -a -l "${1}" || exit
-        cd_box_shut "${1}"
+        cd_shut "${1}"
     fi
 }
 
@@ -685,6 +682,10 @@ cd_mkdir () {
     fi
 }
 
+cd_open () {
+    echo "${CD_OPEN}${@}"
+}
+
 cd_openssl () {
 local file="${1}"
     if [ -f "${file}" ] ; then
@@ -714,6 +715,10 @@ shift
     fi
 }
 
+cd_shut () {
+    echo "${CD_SHUT}${@}"
+}
+
 cd_split () {
     echo "${CD_SPLIT}"
 }