diff --git a/practice_projects/cmd_email.py b/practice_projects/cmd_email.py
index cb7274f..0900956 100644
--- a/practice_projects/cmd_email.py
+++ b/practice_projects/cmd_email.py
@@ -3,20 +3,37 @@
 
 from selenium import webdriver
 from time import sleep
+import sys
+
+if len(sys.argv) < 3:
+    print('Usage: python cmd_email.py [sendto] [message]')
+    sys.exit()
 
 browser = webdriver.Chrome()
 browser.get('https://ui.ptlogin2.qq.com/cgi-bin/login?style=9&appid=522005705&daid=4&s_url=https%3A%2F%2Fw.mail.qq.com%2Fcgi-bin%2Flogin%3Fvt%3Dpassport%26vm%3Dwsk%26delegate_url%3D%26f%3Dxhtml%26target%3D&hln_css=http%3A%2F%2Fmail.qq.com%2Fzh_CN%2Fhtmledition%2Fimages%2Flogo%2Fqqmail%2Fqqmail_logo_default_200h.png&low_login=1&hln_autologin=%E8%AE%B0%E4%BD%8F%E7%99%BB%E5%BD%95%E7%8A%B6%E6%80%81&pt_no_onekey=1')
-sleep(2)
+sleep(1)
 try:
     qq = browser.find_element_by_id('u')
-    qq.send_keys('375575128')
+    qq.send_keys('') # qq
     password = browser.find_element_by_id('p')
-    password.send_keys('FzVSIPYk87890310')
+    password.send_keys('') ## qq password
     go = browser.find_element_by_id('go')
     go.click()
     sleep(1)
     password2 = browser.find_element_by_id('pwd')
-    password2.send_keys('Cpz87890310')
+    password2.send_keys('') # mail password
     password2.submit()
+    sleep(1)
+    write = browser.find_element_by_css_selector('.qm_btnIcon')
+    write.click()
+    sendto = browser.find_element_by_id('showto')
+    sendto.send_keys(sys.argv[1])
+    subject = browser.find_element_by_id('subject')
+    subject.send_keys('System mail by python')
+    content = browser.find_element_by_id('content')
+    content.send_keys(' '.join(sys.argv[2:]))
+    sleep(2)
+    submit = browser.find_element_by_css_selector('.qm_btn.qm_btn_Blue')
+    submit.click()
 except:
     print('Was not able to find an element with your qq.')
diff --git a/practice_projects/deleting_unneeded_files.py b/practice_projects/deleting_unneeded_files.py
index 1e2e390..470cabb 100644
--- a/practice_projects/deleting_unneeded_files.py
+++ b/practice_projects/deleting_unneeded_files.py
@@ -1,10 +1,12 @@
 #!python3
-# deleting_unneeded_files.py - walks through a folder tree and searches for exceptionally large files or folders. say,
-# ones that have a file size of more than 100MB. Print these files with their absolute path to the screen.
+# deleting_unneeded_files.py - walks through a folder tree and searches for 
+# exceptionally large files or folders. say, ones that have a file size of more
+# than 100MB. Print these files with their absolute path to the screen.
 
 import os
 import shutil
 
+
 def deleting_large_files(fd, mega):
     for foldername, subfolders, filenames in os.walk(fd):
         for filename in filenames:
@@ -13,7 +15,7 @@ def deleting_large_files(fd, mega):
             size /= 1024 * 1024
             if size > mega:
                 print(filepath)
-                #os.unlink(filepath)
+                # os.unlink(filepath)
 
 
 deleting_large_files("D:\\BaiduNetdiskDownload", 10)