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How to use module_exists method in lisa

Best Python code snippet using lisa_python

verify_pipsta_install.py

Source:verify_pipsta_install.py

...31        struct.pack('iL', bytes, names.buffer_info()[0])32    ))[0]33    namestr = names.tostring()34    return [namestr[i:i+32].split('\0', 1)[0] for i in range(0, outbytes, 32)]35def module_exists(module_name):36    try:37        __import__(module_name)38    except ImportError:39        return False40    return True41def os_check():42    return (platform.system() == 'Linux')43    44def python_check():45    ok = (sys.version_info > (2, 6) and sys.version_info < (3, 0))46    if not ok:47        print('The demoes are targeted at python2 versions 2.6 and above')48    return ok49    50def pyusb_check():51    ok = module_exists('usb') == True and module_exists('usb.core') == True \52        and module_exists('usb.util') == True53    if not ok:54        print('The Pipsta is connected over USB, the demoes all depend on '55              'the pyusb module')56    return ok57    58def pillow_check():59    if not module_exists('PIL.Image'):60        print('The Pillow library for python is not installed and is required '61              'by most of the demoes')62        return False63    64    return True65    66def usb_enumeration_check():67    import usb.core68    dev = usb.core.find(idVendor=PIPSTA_USB_VENDOR_ID,69                        idProduct=PIPSTA_USB_PRODUCT_ID)70    assert dev, 'Printer failed to enumerate'71    return dev72    73def wait_for_printer(dev):74    import struct75    status = struct.unpack('B', dev.ctrl_transfer(0xC0, 0x0d, 0x0200, 0, 1))[0]76    while status & 0x40 == 0x40:77        print('Printer is in error state can you check the following -')78        print('  Paper is installed')79        print('  Printers power supply is connected')80        print('  The LED on the front of the panel is a constant green')81        raw_input('Press return to continue ')82        status = struct.unpack('B', dev.ctrl_transfer(0xC0, 0x0d, 0x0200, 0, 1))[0]83        84def get_default_interface(dev, cfg):85    import usb.core86    interface_number = cfg[(0, 0)].bInterfaceNumber87    usb.util.claim_interface(dev, interface_number)88    alternate_setting = usb.control.get_interface(dev, interface_number)89    interface = usb.util.find_descriptor(90        cfg, bInterfaceNumber=interface_number,91        bAlternateSetting=alternate_setting)92    return interface93def check_bulk_read(interface):  94    import usb.core  95    usb_in = usb.util.find_descriptor(96        interface,97        custom_match=lambda e:98        usb.util.endpoint_direction(e.bEndpointAddress) ==99        usb.util.ENDPOINT_IN100    )101    assert usb_in, 'No bulk in endpoint found for printer'102    from usb.core import USBError103    try:104        junk = usb_in.read(1)105        while junk:106            print(junk)107    except USBError as unused:108        pass109        110    return usb_in111    112def check_bulk_write(interface):113    import usb.core114    usb_out = usb.util.find_descriptor(115        interface,116        custom_match=lambda e:117        usb.util.endpoint_direction(e.bEndpointAddress) ==118        usb.util.ENDPOINT_OUT119    )120    assert usb_out, 'No bulk out endpoint found for printer'121    return usb_out122def ok_if_found(found):123    return 'Ok' if found else 'Missing'124def perform_connection_test(core, web, gui):125    dev = usb_enumeration_check()126    # Configure USB connection127    dev.reset()128    dev.set_configuration()129    cfg = dev.get_active_configuration()130    assert cfg, 'Failed to find an active configuration for the printer'131    # Check printer is powered132    wait_for_printer(dev)133    interface = get_default_interface(dev, cfg)134    usb_in = check_bulk_read(interface)135    usb_out = check_bulk_write(interface)136    # Check full bulk communications137    usb_out.write(b'\x1dI\x06')138    printer_id = usb_in.read(9)139    assert printer_id and printer_id != '', 'Printer did not respond with a valid ID'140    141    print('Successful bi-directional bulk communications established with '142          'printer')143    # Print, results144    printer_id = ''.join([chr(c) for c in printer_id]).strip()145    usb_out.write('Welcome to Pipsta ({})\n'.format(printer_id))146    (distname, linux_version, linux_id) = platform.linux_distribution()147    usb_out.write('Running on {} V{}\n'.format(distname, linux_version))148    (system, node, release, version, machine, processor) = platform.uname()149    usb_out.write('Based on {} V{} for\n'.format(system, release))150    usb_out.write('{} with {} arch.\n\n'.format(node, machine))151    152    for interface in all_interfaces():153        address = get_ip_address(interface)154        usb_out.write('{}\t{}\n'.format(interface, address))155        156    usb_out.write('\nRunning python V{}.{}\n\n'.format(157        sys.version_info[0], sys.version_info[1]))158    usb_out.write('OS            = Ok\n')159    usb_out.write('Python        = Ok\n')160    usb_out.write('    struct    = Ok\n')161    usb_out.write('    Pillow    = {0}\n'.format(ok_if_found(core[0])))162    usb_out.write('    bitarray  = {0}\n'.format(ok_if_found(core[1])))163    usb_out.write('    qrcode    = {0}\n'.format(ok_if_found(core[2])))164    usb_out.write('    MySQLdb   = {0}\n'.format(ok_if_found(web)))165    usb_out.write('    PyQt4     = {0}\n'.format(ok_if_found(gui[0])))166    usb_out.write('    fclist    = {0}\n'.format(ok_if_found(gui[1])))167    168    usb_out.write(FEED_PAST_CUTTER)169def main():170    print('Testing the Pipsta installation')171    os_ok = os_check()172    if os_ok == False:173        sys.exit("The demoes are written for Raspberry-Pi's running Raspbian")174        175    py_ok = python_check()176    pyusb_ok = False177    bitarray_ok = False178    pillow_ok = False179    qr_code_ok = False180    mysql_db_ok = False181    struct_ok = False182    pyqt4_ok = False183    fclist_ok = False184    if py_ok == False:185        print('Install python2 versions 2.6 or greater. Try one of -')186        print('    sudo apt-get install python2.6')187        print('or')188        print('    sudo apt-get install python2.7')189        print190    else:191        try:192            pyusb_ok = pyusb_check()193            bitarray_ok = module_exists('bitarray')194            pillow_ok = pillow_check()195            qrcode_ok = module_exists('qrcode')196            mysql_db_ok = module_exists('MySQLdb')197            struct_ok = module_exists('struct')198            pyqt4_ok = module_exists('PyQt4')199            fclist_ok = module_exists('fclist')200        except AssertionError as e:201            print(e)202            pass203        204    print('The following problems were found that may prevent you '205          'running all of the examples.')206    print207    print('To install python modules we uses pip.  To install pip try -')208    print('    sudo apt-get install python-pip python-dev')209    print210    if pyusb_ok == False or pillow_ok == False or bitarray_ok == False \211                    or qrcode_ok == False or struct_ok == False:212        print('The following will install the basic dependencies -')213        cmd_str = '    sudo pip install '...

extensions.py

Source:extensions.py

1# -*- coding: utf-8 -*-2from .helpers import module_exists3if module_exists('pytz.gae') and module_exists('flaskext.babel'):4    from pytz.gae import pytz5    from flaskext.babel import Babel6    babel = Babel()7if module_exists('flaskext.sqlalchemy'):8    from flaskext.sqlalchemy import SQLAlchemy9    db = SQLAlchemy()10if module_exists('flaskext.mail'):11    from flaskext.mail import Mail12    mail = Mail()13if module_exists('flaskext.cache'):14    from flaskext.cache import Cache15    cache = Cache()16if module_exists('flaskext.login'):17    from flaskext.login import LoginManager18    login_manager = LoginManager()19if module_exists('flaskext.debugtoolbar'):20    from flaskext.debugtoolbar import DebugToolbarExtension...

env_supports.py

Source:env_supports.py

1"""each attribute indicates a supported module or feature."""2import os3import sys4    5def module_exists(mod):6    try:7        __import__(mod)8    except ImportError:9        return False10    else:11        return True12sqlobject = module_exists('sqlobject')13sqlalchemy = module_exists('sqlalchemy')14elixir = module_exists('elixir')...

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