def test():
    """Run dependency widget test"""
    from spyderlib import dependencies
    
    # Test sample
    dependencies.add("IPython", "Enhanced Python interpreter", ">=0.13")
    dependencies.add("matplotlib", "Interactive data plotting", ">=1.0")
    dependencies.add("sympy", "Symbolic Mathematics", ">=10.0")
    dependencies.add("foo", "Non-existent module", ">=1.0")
    
    from spyderlib.utils.qthelpers import qapplication
    app = qapplication()
    dlg = DependenciesDialog(None)
    dlg.set_data(dependencies.DEPENDENCIES)
    dlg.show()
    sys.exit(dlg.exec_())

        # Numpy scalars all inherit from np.generic.
        # Numpy arrays all inherit from np.ndarray.
        # If we check that we are certain we have one of these
        # types then we are less likely to generate an exception below.
            try:
                return obj.dtype.type
            except (AttributeError, RuntimeError):
                #  AttributeError: some NumPy objects have no dtype attribute
                #  RuntimeError: happens with NetCDF objects (Issue 998)
                return


#----Pandas support
PANDAS_REQVER = '>=0.13.1'
dependencies.add('pandas',  _("View and edit DataFrames and Series in the "
                              "Variable Explorer"),
                 required_version=PANDAS_REQVER)
if programs.is_module_installed('pandas', PANDAS_REQVER):
    from pandas import DataFrame, TimeSeries
else:
    DataFrame = TimeSeries = FakeObject      # analysis:ignore


#----PIL Images support
try:
    from spyderlib import pil_patch
    Image = pil_patch.Image.Image
except ImportError:
    Image = FakeObject  # analysis:ignore

if QTCONSOLE_INSTALLED:
    from spyderlib.widgets.ipython import IPythonControlWidget
else:
    IPythonControlWidget = None  # analysis:ignore

# Check if we can import Sphinx to activate rich text mode
try:
    from spyderlib.utils.help.sphinxify import (CSS_PATH, sphinxify, warning,
                                                generate_context, usage)
    sphinx_version = programs.get_module_version('sphinx')
except (ImportError, TypeError):
    sphinxify = sphinx_version = None  # analysis:ignore

# To add sphinx dependency to the Dependencies dialog
SPHINX_REQVER = '>=0.6.6'
dependencies.add("sphinx", _("Rich text help"),
                 required_version=SPHINX_REQVER)


class ObjectComboBox(EditableComboBox):
    """
    QComboBox handling object names
    """
    # Signals
    valid = Signal(bool, bool)

    def __init__(self, parent):
        EditableComboBox.__init__(self, parent)
        self.help = parent
        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
        self.tips = {True: '', False: ''}

from spyderlib.baseconfig import _, debug_print
from spyderlib.utils import programs
from spyderlib.utils.debug import log_last_error, log_dt
from spyderlib.utils.dochelpers import getsignaturefromtext
from spyderlib.utils.introspection.plugin_manager import (
    DEBUG_EDITOR, LOG_FILENAME, IntrospectionPlugin)

try:
    import jedi
except ImportError:
    jedi = None


JEDI_REQVER = '>=0.8.1'
dependencies.add('jedi',
                 _("(Experimental) Editor's code completion,"
                   " go-to-definition and help"),
                 required_version=JEDI_REQVER)


class JediPlugin(IntrospectionPlugin):
    """
    Jedi based introspection plugin for jedi

    Experimental Editor's code completion, go-to-definition and help
    """

    # ---- IntrospectionPlugin API --------------------------------------------
    name = 'jedi'

    def load_plugin(self):
        """Load the Jedi introspection plugin"""

# Local imports
from spyderlib.py3compat import (NUMERIC_TYPES, TEXT_TYPES, to_text_string,
                                 is_text_string, is_binary_string, reprlib,
                                 PY2, to_binary_string)
from spyderlib.utils import programs
from spyderlib import dependencies
from spyderlib.config.base import _


#==============================================================================
# Dependencies
#==============================================================================
PANDAS_REQVER = '>=0.13.1'
dependencies.add('pandas',  _("View and edit DataFrames and Series in the "
                              "Variable Explorer"),
                 required_version=PANDAS_REQVER, optional=True)

NUMPY_REQVER = '>=1.7'
dependencies.add("numpy", _("View and edit two and three dimensional arrays "
                            "in the Variable Explorer"),
                 required_version=NUMPY_REQVER, optional=True)

#==============================================================================
# FakeObject
#==============================================================================
class FakeObject(object):
    """Fake class used in replacement of missing modules"""
    pass

from spyderlib.config.base import _, DEBUG, debug_print, get_conf_path
from spyderlib.utils import sourcecode
from spyderlib.utils.introspection.plugin_client import PluginClient
from spyderlib.utils.introspection.utils import CodeInfo


PLUGINS = ['rope', 'jedi', 'fallback']

LOG_FILENAME = get_conf_path('introspection.log')
DEBUG_EDITOR = DEBUG >= 3
LEAD_TIME_SEC = 0.25


ROPE_REQVER = '>=0.9.4'
dependencies.add('rope',
                 _("Editor's code completion, go-to-definition and help"),
                 required_version=ROPE_REQVER)

JEDI_REQVER = '>=0.8.1'
dependencies.add('jedi',
                 _("Editor's code completion, go-to-definition and help"),
                 required_version=JEDI_REQVER)


class PluginManager(QObject):

    introspection_complete = Signal(object)

    def __init__(self, executable):
        super(PluginManager, self).__init__()
        plugins = OrderedDict()

    from spyderlib.widgets.ipython import IPythonControlWidget
else:
    IPythonControlWidget = None  # analysis:ignore

# Check for Sphinx presence to activate rich text mode
if programs.is_module_installed('sphinx', '>=0.6.6'):
    sphinx_version = programs.get_module_version('sphinx')
    from spyderlib.utils.inspector.sphinxify import (CSS_PATH, sphinxify,
                                                     warning, generate_context,
                                                     usage)
else:
    sphinxify = sphinx_version = None  # analysis:ignore

# To add sphinx dependency to the Dependencies dialog
SPHINX_REQVER = '>=0.6.6'
dependencies.add("sphinx", _("Rich text help on the Object Inspector"),
                 required_version=SPHINX_REQVER)


class ObjectComboBox(EditableComboBox):
    """
    QComboBox handling object names
    """
    def __init__(self, parent):
        EditableComboBox.__init__(self, parent)
        self.object_inspector = parent
        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
        self.tips = {True: '', False: ''}
        
    def is_valid(self, qstr=None):
        """Return True if string is valid"""
        if not self.object_inspector.source_is_console():

                if 'analysis:ignore' not in \
                   to_text_string(lines[warning.lineno-1], coding):
                    results.append((warning.message % warning.message_args,
                                    warning.lineno))
    except Exception:
        # Never return None to avoid lock in spyderlib/widgets/editor.py
        # See Issue 1547
        results = []
        if DEBUG_EDITOR:
            traceback.print_exc()  # Print exception in internal console
    return results

# Required version:
# Why 0.5 (Python2)? Because it's based on _ast (thread-safe)
PYFLAKES_REQVER = '>=0.6.0' if PY3 else '>=0.5.0'
dependencies.add("pyflakes", _("Real-time code analysis on the Editor"),
                 required_version=PYFLAKES_REQVER)

PEP8_REQVER = '>=0.6'
dependencies.add("pep8", _("Real-time code style analysis on the Editor"),
                 required_version=PEP8_REQVER)


def is_pyflakes_installed():
    """Return True if pyflakes required version is installed"""
    return programs.is_module_installed('pyflakes', PYFLAKES_REQVER)


def get_checker_executable(name):
    """Return checker executable in the form of a list of arguments
    for subprocess.Popen"""
    if programs.is_program_installed(name):

        return
    process = subprocess.Popen([PYLINT, '--version'],
                               stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                               cwd=osp.dirname(PYLINT_PATH),
                               shell=True if os.name == 'nt' else False)
    lines = to_unicode_from_fs(process.stdout.read()).splitlines()
    if lines:
        regex = '({0}*|pylint-script.py) ([0-9\.]*)'.format(PYLINT)
        match = re.match(regex, lines[0])
        if match is not None:
            return match.groups()[1]


PYLINT_REQVER = '>=0.25'
PYLINT_VER = get_pylint_version()
dependencies.add("pylint", _("Static code analysis"),
                 required_version=PYLINT_REQVER, installed_version=PYLINT_VER)


#TODO: display results on 3 columns instead of 1: msg_id, lineno, message
class ResultsTree(OneColumnTree):
    def __init__(self, parent):
        OneColumnTree.__init__(self, parent)
        self.filename = None
        self.results = None
        self.data = None
        self.set_title('')
        
    def activated(self, item):
        """Double-click event"""
        data = self.data.get(id(item))
        if data is not None:

from spyderlib.utils.help.sphinxify import (CSS_PATH, sphinxify, warning,
                                            generate_context, usage)
from spyderlib.utils.qthelpers import (create_toolbutton, add_actions,
                                       create_action)
from spyderlib.widgets.comboboxes import EditableComboBox
from spyderlib.widgets.sourcecode import codeeditor
from spyderlib.widgets.findreplace import FindReplace
from spyderlib.widgets.browser import FrameWebView
from spyderlib.widgets.externalshell.pythonshell import ExtPythonShellWidget
from spyderlib.plugins import SpyderPluginWidget, PluginConfigPage
from spyderlib.py3compat import to_text_string, get_meth_class_inst


# Sphinx dependency
dependencies.add("sphinx", _("Show help for objects in the Editor and "
                             "Consoles in a dedicated pane"),
                 required_version='>=0.6.6')


#XXX: Hardcoded dependency on optional IPython plugin component
#     that requires the hack to make this work without IPython
if QTCONSOLE_INSTALLED:
    from spyderlib.widgets.ipython import IPythonControlWidget
else:
    IPythonControlWidget = None  # analysis:ignore


class ObjectComboBox(EditableComboBox):
    """
    QComboBox handling object names
    """

import os

from spyderlib.qt.QtGui import QWidget, QHBoxLayout, QLabel
from spyderlib.qt.QtCore import QTimer

# Local import
from spyderlib.baseconfig import _
from spyderlib.guiconfig import get_font
from spyderlib.py3compat import to_text_string
from spyderlib import dependencies


if not os.name == 'nt':
    PSUTIL_REQVER = '>=0.3'
    dependencies.add("psutil", _("CPU and memory usage info in the status bar"),
                     required_version=PSUTIL_REQVER)


class StatusBarWidget(QWidget):
    def __init__(self, parent, statusbar):
        QWidget.__init__(self, parent)

        self.label_font = font = get_font('editor')
        font.setPointSize(self.font().pointSize())
        font.setBold(True)
        
        layout = QHBoxLayout()
        layout.setContentsMargins(0, 0, 0, 0)
        self.setLayout(layout)

        statusbar.addPermanentWidget(self)

IPython configuration variables needed by Spyder
"""

from spyderlib.utils import programs
from spyderlib import dependencies
from spyderlib.config.base import _


# Constants
QTCONSOLE_REQVER = '>=4.0'
ZMQ_REQVER = ">=13.0.0"
NBCONVERT_REQVER = ">=4.0"


# Dependencies
dependencies.add("qtconsole", _("Jupyter Qtconsole integration"),
                 required_version=QTCONSOLE_REQVER)
dependencies.add("nbconvert", _("Manipulate Jupyter notebooks on the Editor"),
                 required_version=NBCONVERT_REQVER)


# Auxiliary functions
def is_qtconsole_installed():
    pyzmq_installed = programs.is_module_installed('zmq', version=ZMQ_REQVER)
    pygments_installed = programs.is_module_installed('pygments')
    qtconsole_installed = programs.is_module_installed('qtconsole',
                                                       version=QTCONSOLE_REQVER)

    if pyzmq_installed and pygments_installed and qtconsole_installed:
        return True
    else:
        return False

# Licensed under the terms of the MIT License
# (see spyderlib/__init__.py for details)

"""
IPython configuration variables needed by Spyder
"""

from spyderlib.utils import programs
from spyderlib import dependencies
from spyderlib.config.base import _


IPYTHON_REQVER = '>=3.0'
ZMQ_REQVER = '>=13.0.0'

dependencies.add("IPython", _("IPython Console integration"),
                 required_version=IPYTHON_REQVER)
dependencies.add("zmq", _("IPython Console integration"),
                 required_version=ZMQ_REQVER)

def is_qtconsole_installed():
    ipython_installed = programs.is_module_installed('IPython.qt',
                                                     version=IPYTHON_REQVER)
    pyzmq_installed = programs.is_module_installed('zmq', version=ZMQ_REQVER)
    pygments_installed = programs.is_module_installed('pygments')

    if ipython_installed and pyzmq_installed and pygments_installed:    
        return True
    else:
        return False

IPYTHON_QT_INSTALLED = is_qtconsole_installed()

# Local imports
from spyderlib import dependencies
from spyderlib.baseconfig import _
from spyderlib.config import CONF
from spyderlib.utils.misc import get_error_match, remove_backslashes
from spyderlib.utils import programs
from spyderlib.utils.qthelpers import get_icon, create_action
from spyderlib.widgets.tabs import Tabs
from spyderlib.widgets.ipython import IPythonClient
from spyderlib.widgets.findreplace import FindReplace
from spyderlib.plugins import SpyderPluginWidget, PluginConfigPage
from spyderlib.py3compat import to_text_string, u


SYMPY_REQVER = '>=0.7.0'
dependencies.add("sympy", _("Symbolic mathematics in the IPython Console"),
                 required_version=SYMPY_REQVER)


def tunnel_to_kernel(ci, hostname, sshkey=None, password=None, timeout=10):
    """tunnel connections to a kernel via ssh. remote ports are specified in
    the connection info ci."""
    lports = tunnel.select_random_ports(4)
    rports = ci['shell_port'], ci['iopub_port'], ci['stdin_port'], ci['hb_port']
    remote_ip = ci['ip']
    for lp, rp in zip(lports, rports):
        tunnel.ssh_tunnel(lp, rp, hostname, remote_ip, sshkey, password, timeout)
    return tuple(lports)


class IPythonConsoleConfigPage(PluginConfigPage):