diff --git a/hp_printing/install_on_raspberyy b/hp_printing/install_on_raspberyy
new file mode 100644
index 0000000..5c239ff
--- /dev/null
+++ b/hp_printing/install_on_raspberyy
@@ -0,0 +1,14 @@
+# install_on_raspberry
+
+
+## env
+
+- https://developers.hp.com/hp-linux-imaging-and-printing/install/manual/distros/other
+
+``` bash
+
+sudo apt insatll cups
+sudo apt install libjpeg-dev
+sudo apt install libcups2-dev
+sudo apt install libusb-1.0-0-dev sane libsane-dev libdbus-1-dev
+```
\ No newline at end of file
diff --git a/ngrok/ngrok.md b/ngrok/ngrok.md
index 3c40b41..7c4263c 100755
--- a/ngrok/ngrok.md
+++ b/ngrok/ngrok.md
@@ -41,3 +41,5 @@ trust_host_root_certs: false
 ./ngrok -subdomain pub -proto=http -config=ngrok.cfg 8000
 
 ./ngrok -subdomain pub -proto=http -config=ngrok.cfg 22
+
+screen -dmS ngrok sudo ngrok start ssh
\ No newline at end of file
diff --git a/python/logging.md b/python/logging.md
new file mode 100644
index 0000000..e8b3c57
--- /dev/null
+++ b/python/logging.md
@@ -0,0 +1,27 @@
+# logging
+
+``` python
+    import logging
+
+    logger = logging.getLogger("simple_example")
+    logger.setLevel(logging.DEBUG)
+    # 建立一个filehandler来把日志记录在文件里，级别为debug以上
+    fh = logging.FileHandler("spam.log")
+    fh.setLevel(logging.DEBUG)
+    # 建立一个streamhandler来把日志打在CMD窗口上，级别为error以上
+    ch = logging.StreamHandler()
+    ch.setLevel(logging.ERROR)
+    # 设置日志格式
+    formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
+    ch.setFormatter(formatter)
+    fh.setFormatter(formatter)
+    # 将相应的handler添加在logger对象中
+    logger.addHandler(ch)
+    logger.addHandler(fh)
+    # 开始打日志
+    logger.debug("debug message")
+    logger.info("info message")
+    logger.warning("warn message")
+    logger.error("error message")
+    logger.critical("critical message")
+```
\ No newline at end of file