def normalize(cell_block):
    # The cell blocks come in with every line except the first indented at
    # least 20 spaces.  This removes the first 20 spaces off of those lines.
    lines = textwrap.dedent(' ' * 20 + cell_block).splitlines()
    cell = Cell()

    while lines:
        line = lines.pop(0)

        if line.startswith('Quality'):
            for re_name, quality_re in quality_re_dict.items():
                match_result = quality_re.search(line)
                if match_result is not None:
                    cell.quality, signal = match_result.groups()
                    if re_name == 'relative':
                        actual, total = map(int, signal.split('/'))
                        cell.signal = db2dbm(int((actual / total) * 100))
                    else:
                        cell.signal = int(signal)
                    break

        elif line.startswith('Bit Rates'):
            values = split_on_colon(line)[1].split('; ')

            # consume next line of bit rates, because they are split on
            # different lines, sometimes...
            while lines[0].startswith(' ' * 10):
                values += lines.pop(0).strip().split('; ')

            cell.bitrates.extend(values)
        elif ':' in line:
            key, value = split_on_colon(line)
            key = normalize_key(key)

            if key == 'ie':
                if 'Unknown' in value:
                    continue

                # consume remaining block
                values = [value]
                while lines and lines[0].startswith(' ' * 4):
                    values.append(lines.pop(0).strip())

                if 'WPA2' in value:
                    cell.encryption_type = 'wpa2'
                elif 'WPA' in value:
                    cell.encryption_type = 'wpa'
            if key == 'frequency':
                frequency, channel = frequency_re.search(value).groups()
                cell.frequency = frequency
                cell.channel = int(channel)
            elif key in normalize_value:
                setattr(cell, key, normalize_value[key](value))

    # It seems that encryption types other than WEP need to specify their
    # existence.
    if cell.encrypted and not hasattr(cell, 'encryption_type'):
        cell.encryption_type = 'wep'

    return cell

    def test_unencrypted(self):
        cell = Cell()
        cell.ssid = 'SSID'
        cell.encrypted = False

        scheme = Scheme.for_cell('wlan0', 'test', cell)

        self.assertEqual(scheme.options, {
            'wireless-essid': 'SSID',
            'wireless-channel': 'auto',
        })

    def test_wep(self):
        cell = Cell()
        cell.ssid = 'SSID'
        cell.encrypted = True
        cell.encryption_type = 'wep'

        scheme = Scheme.for_cell('wlan0', 'test', cell, 'passkey')

        self.assertEqual(scheme.options, {
            'wireless-essid': 'SSID',
            'wireless-key': 'passkey',
        })

    def test_wpa(self):
        cell = Cell()
        cell.ssid = 'SSID'
        cell.encrypted = True
        cell.encryption_type = 'wpa'

        scheme = Scheme.for_cell('wlan0', 'test', cell, 'passkey')

        self.assertEqual(scheme.options, {
            'wpa-ssid': 'SSID',
            'wpa-psk': 'ea1548d4e8850c8d94c5ef9ed6fe483981b64c1436952cb1bf80c08a68cdc763',
            'wireless-channel': 'auto',
        })

    def update(self):
        """Update Wifi stats using the input method.

        Stats is a list of dict (one dict per hotspot)

        :returns: list -- Stats is a list of dict (hotspot)
        """
        # Reset stats
        self.reset()

        # Exist if we can not grab the stats
        if not wifi_tag:
            return self.stats

        if self.input_method == 'local':
            # Update stats using the standard system lib

            # Grab network interface stat using the PsUtil net_io_counter method
            try:
                netiocounters = psutil.net_io_counters(pernic=True)
            except UnicodeDecodeError:
                return self.stats

            for net in netiocounters:
                # Do not take hidden interface into account
                if self.is_hide(net):
                    continue

                # Grab the stats using the Wifi Python lib
                try:
                    wifi_cells = Cell.all(net)
                except InterfaceError:
                    # Not a Wifi interface
                    pass
                except Exception as e:
                    # Other error
                    logger.debug("WIFI plugin: Can not grab cellule stats ({})".format(e))
                    pass
                else:
                    for wifi_cell in wifi_cells:
                        hotspot = {
                            'key': self.get_key(),
                            'ssid': wifi_cell.ssid,
                            'signal': wifi_cell.signal,
                            'quality': wifi_cell.quality,
                            'encrypted': wifi_cell.encrypted,
                            'encryption_type': wifi_cell.encryption_type if wifi_cell.encrypted else None
                        }
                        # Add the hotspot to the list
                        self.stats.append(hotspot)

        elif self.input_method == 'snmp':
            # Update stats using SNMP

            # Not implemented yet
            pass

        return self.stats

 def test_no_encryption(self):
     cell = Cell.from_string(IWLIST_SCAN_NO_ENCRYPTION)
     self.assertFalse(cell.encrypted)
     self.assertEqual(cell.ssid, 'My Wireless Network')
     self.assertEqual(cell.signal, -51)
     self.assertEqual(cell.quality, '59/70')
     self.assertEqual(cell.frequency, '2.437 GHz')
     self.assertEqual(cell.mode, 'Master')
     self.assertEqual(cell.channel, 6)

 def test_wpa2(self):
     cell = Cell.from_string(IWLIST_SCAN_WPA2)
     self.assertTrue(cell.encrypted)
     self.assertEqual(cell.encryption_type, 'wpa2')

 def test_alternative_iwlist_output(self):
     # https://github.com/rockymeza/wifi/issues/12
     cell = Cell.from_string(ALTERNATIVE_OUTPUT)
     self.assertEqual(cell.quality, '78/100')
     self.assertEqual(cell.signal, -92)

 def test_absolute_quality(self):
     # https://github.com/rockymeza/wifi/pull/45
     cell = Cell.from_string(ABSOLUTE_QUALITY)
     self.assertEqual(cell.quality, '38/100')
     self.assertEqual(cell.signal, -92)

 def test_wep(self):
     cell = Cell.from_string(IWLIST_SCAN_WEP)
     self.assertTrue(cell.encrypted)
     self.assertEqual(cell.encryption_type, 'wep')

 def test_list_index_error(self):
     # https://github.com/rockymeza/wifi/issues/42
     cell = Cell.from_string(LIST_INDEX_ERROR)

 def test_frequency_no_channel_output(self):
     # https://github.com/rockymeza/wifi/issues/39
     cell = Cell.from_string(FREQUENCY_NO_CHANNEL_OUTPUT)
     self.assertEqual(cell.channel, 149)

 def test_noname_cell(self):
     cell = Cell.from_string(NONAME_WIRELESS_NETWORK)
     self.assertEqual(cell.ssid, '')

 def test_no_channel_output(self):
     # https://github.com/rockymeza/wifi/issues/24
     cell = Cell.from_string(NO_CHANNEL_OUTPUT)
     self.assertEqual(cell.channel, 11)

 def test_signal_level_out_of_sixty(self):
     cell = Cell.from_string(ALTERNATIVE_OUTPUT2)
     self.assertEqual(cell.signal, -71)

def tick():
    '''
    ***REMOVE IF WE CAN TELL IF WE ARE CONNECTED
    If there is only 1 wifi network, it means
    that we are already connected or that there
    is only 1 wifi network. Do nothing since the
    user can try and connect to that network
    on there own.
    '''
    '''
    A list of the addresses of networks that are repetitive with each scan.
    Make the noted and previous network lists global
    '''
    global prevNetworks
    global notedNetworks
    
    lastingNetworks = []

    '''
    Parse the data from the already parsed data of
    Cell.all("wlan0") and turn it into a list of
    the wifi networks each represented by the 
    Network class. When parsing, if a network has
    the name of another in the list, keep/add
    whichever network has the strongest signal.
    If each have the same signal, choose the
    current network being iterated over.
    Ex: Two seperate xfinitywifi networks.
    '''
    liveNetworks = []
    for network in Cell.all("wlan0"):
        ssid = network.ssid
        address = network.address
        signal = round(int((network.quality.split("/")[0]))/.7)
        encrypted = network.encrypted
        parsedNetwork = Network(ssid,address,signal,encrypted)
        if (getNetworkFromSSID(liveNetworks, ssid) is not None):
            otherNetwork = getNetworkFromSSID(liveNetworks, ssid)
            if (otherNetwork.signal <= signal):
                removeNetwork(liveNetworks, ssid)
                liveNetworks.append(parsedNetwork)
        else:
            liveNetworks.append(parsedNetwork)
    
    '''
    With our fresh set of live parsed networks,
    we now need to compare them with our older
    previous set of networks so that we can
    update the vital list of lasting networks.
    We also need to average out the signal from
    the previous signal and current signal for
    more accuracy and increase the amount of times
    this network has been scanned in a row if it appears
    in the list of old networks. We also need to add
    its MAC Address if it's not already in the lasting
    list of networks.
    '''
            
    for network in liveNetworks:
        if (not(getNetworkFromMAC(prevNetworks,network.address) == None)):
            oldNetwork = getNetworkFromMAC(prevNetworks,network.address)
            network.count = (oldNetwork.count + 1)
            network.signal = round((network.signal + oldNetwork.signal) / 2)
            if (notedNetworks.count(network.address) == 0 and 
                lastingNetworks.count(network.address) == 0):
                lastingNetworks.append(network.address)
                
    
    '''
     Run through our list of lasting networks and check
     if each network has had an average signal of 50% or
     above and has been scanned 3 times in a row. If so,
     display the notification that the network is available
     and remove it from the list of lasting network MACs.
     Add it to the list of noted networks so it doesn't
     get thrown back in the mix.
    '''
                
                
    '''
    Remove noted network MAC addresses if they no longer are lasting
    '''
    
    removedMACS = []
    for address in lastingNetworks:
        network = getNetworkFromMAC(liveNetworks, address)
        if (network.signal >= 50 and network.count >= 3):
            removedMACS.append(address)
            if (notedNetworks.count(address) == 0):
                notedNetworks.append(address)
                ssid = network.ssid
                encrypted = None
                if (network.encrypted is True):
                    encrypted = "Yes"
                else:
                    encrypted = "No"
                if ("x00" in str(ssid)):
                    ssid = "Unknown"
            pynotify.init("netscan - " + network.ssid)
            notification = pynotify.Notification("Network Detected",
#.........这里部分代码省略.........

 def test_blank_ssid(self):
     # https://github.com/rockymeza/wifi/issues/86
     cell = Cell.from_string(NO_SSID_AT_ALL)
     self.assertEqual(cell.ssid, None)

 def test_noise_data_present(self):
     cell = Cell.from_string(LIST_INDEX_ERROR)
     self.assertEqual(cell.noise, -92)

 def test_noise_no_data(self):
     cell = Cell.from_string(IWLIST_SCAN_NO_ENCRYPTION)
     self.assertEqual(cell.noise, None)