diff --git a/hp_printing/install_on_raspberyy b/hp_printing/install_on_raspberyy
index 5c239ff..8ae42f1 100644
--- a/hp_printing/install_on_raspberyy
+++ b/hp_printing/install_on_raspberyy
@@ -11,4 +11,6 @@ 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
+```
+ Allow All
+sudo usermod -a -G lpadmin ma
\ No newline at end of file
diff --git a/python/logging.md b/python/logging.md
index e8b3c57..5d44ef7 100644
--- a/python/logging.md
+++ b/python/logging.md
@@ -1,27 +1,27 @@
 # logging
 
 ``` python
-    import logging
+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")
+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
diff --git a/python/换源.md b/python/换源.md
new file mode 100644
index 0000000..72ae1aa
--- /dev/null
+++ b/python/换源.md
@@ -0,0 +1,4 @@
+# 换源
+nano ~/.pip/pip.conf
+[global]
+index-url = http://mirrors.aliyun.com/pypi/simple/ 
\ No newline at end of file