from winreg import *

#delete value
def del_env(name):
   key = OpenKey(HKEY_CURRENT_USER, r"datngu", 0, KEY_ALL_ACCESS)
   DeleteValue(key, "1") 
   CloseKey(key)


#delete key
def delete_registry_tree(root, subkey):
    try:
        hkey = OpenKey(root, subkey, access=KEY_ALL_ACCESS)
    except OSError:
        # subkey does not exist
        return
    while True:
        try:
            subsubkey = EnumKey(hkey, 0)
        except OSError:
            # no more subkeys
            break
        delete_registry_tree(hkey, subsubkey)
    CloseKey(hkey)
    DeleteKey(root, subkey)

delete_registry_tree(HKEY_CURRENT_USER, "datngu")

#get key
registry = ConnectRegistry(None, HKEY_LOCAL_MACHINE)
def openRegistryA():

    rawKeyA = OpenKey(registry, "SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System")

    try:
        i = 0
        while 1:
            name, value, type = EnumValue(rawKeyA, i)
            print(name, value)
            i += 1

    except WindowsError:
        print("END")

    CloseKey(rawKeyA)

#setkey
#trong này có cả create key
keyVal = r'Software\Microsoft\Internet Explorer\Main'
try:
    key = OpenKey(HKEY_CURRENT_USER, keyVal, 0, KEY_ALL_ACCESS)
except:
    key = CreateKey(HKEY_CURRENT_USER, keyVal)
SetValueEx(key, "Start Page", 0, REG_SZ, "http://www.blog.pythonlibrary.org/")
#arg 1 = key
#arg 2 = name of the subkey
#arg 4 = type
#arg 5 = value to set
CloseKey(key)