Develop Reference

Python - Creating an instance of a module, getting an error

I am creating a universal text field that can be used in many python turtle projects. I am trying to create an instance of it but I get this error:
>>> import TextField
>>> tf = TextField('None', False)
Traceback (most recent call last):
File "<pyshell#1>", line 1, in <module>
tf = TextField('None', False)
TypeError: 'module' object is not callable
>>>
What in a module causes this type of error? I completely wrote this module and I'm getting an error creating an instance of it :( ... What do I need in this module to make it 'callable'? I have tried adding a def __call__(self): but that doesn't affect the problem at all, nor create any errors.
Here is the beginning of the script where the problem is most likely happening:
# Created by SUPERMECHM500 # repl.it
# Edited by cdlane # stackoverflow.com
class TextField:
TextFieldBorderColor = '#0019fc'
TextFieldBGColor = '#000000'
TextFieldTextColor = '#ffffff'
ShiftedDigits = {
'1':'!',
'2':'#',
'3':'#',
'4':'$',
'5':'%',
'6':'^',
'7':'&',
'8':'*',
'9':'(',
'0':')'
}
def __init__(self, command, CanBeEmpty): # Ex. textField = TextField('Execute()', True)
self.CmdOnEnter = command
self.turtle = Turtle()
self.CanBeEmpty = CanBeEmpty
self.turtle.speed('fastest')
self.inp = []
self.FullOutput = ""
self.TextSeparation = 7
self.s = self.TextSeparation
self.key_shiftL = False
......

The module is not the class. If your class TextField is in a module called TextField, then it is referred to as TextField.TextField.
Or change your import to
from TextField import TextField

instantiate object inside of class

Im trying to understand why I cannot access the methods on an object that is instantiated inside of a class. For example i'm attempting to build a script that utilizes the python-pptx library and I want to wrap the entire slide creation within a class to abstract it and make it a bit more reusable based on my configuration.
class Builder():
def __init__(self, template='template.pptx', output_file='out.pptx'):
self.cust_name = ''
self.author = ''
self.job_title = ''
self.present_date = ''
self.assessment_type = ''
self.template = template
self.agenda = ['Overview','Resources']
self.outfile = output_file
self.prs = Presentation('template.pptx') <--- This is what im referring to.
def addAgendaSlide(self):
agenda_slide = self.prs.add_slide(self.prs.slide_layouts[AGENDA]) <-- When trying to access this
agenda_slide.shapes.title.text = 'Agenda'
agenda_slide.placeholders[10].text = 'A test Agenda slide'
agenda_slide.placeholders[15].top = STANDARD_TOP
agenda_slide.placeholders[15].left = STANDARD_LEFT
agenda_slide.placeholders[15].width = 8229600
agenda_slide.placeholders[15].height = 4572000
for para in self.agenda:
p = agenda_slide.placeholders[15].text_frame.add_paragraph()
p.text = para
Traceback (most recent call last):
File "test.py", line 19, in <module>
test.addAgendaSlide()
File "/dev/pythonpptx/DocMaker/Slides.py", line 89, in addAgendaSlide
agenda_slide = self.prs.add_slide(self.prs.slide_layouts[AGENDA])
AttributeError: 'Presentation' object has no attribute 'add_slide'
If I use the same bits of code outside the class it works fine. I do have other methods in the class that are fine, it seems to be my implementation of the Presentation() bit that is messing me up.
The following works fine:
prs = Presentation('template.pptx')
agenda_slide = prs.slides.add_slide(prs.slide_layouts[AGENDA])
agenda_slide.shapes.title.text = 'Agenda'
agenda_slide.placeholders[15].top = STANDARD_TOP
agenda_slide.placeholders[15].left = STANDARD_LEFT
agenda_slide.placeholders[15].width = 8229600
agenda_slide.placeholders[15].height = 4572000
prs.save('out.pptx')

I think your problem is you are forgetting to add slides as follows:
agenda_slide = self.prs.slides.add_slide(self.prs.slide_layouts[AGENDA])
instead of
agenda_slide = self.prs.add_slide(self.prs.slide_layouts[AGENDA])

Python callback attribute error

I have written a python ROS node to subscribe to two different topics and uses the ApproximateTimeSynchroniser to basically to match the messages via their timestamp and bundle these messages into one callback routine. If I use the callback to simply print out the two messages received it works fine.
However, I would like to populate a geometry_msgs/Pose message using the x and y positions from the received Pose 2D data in the callback routine.Using the code below, I have done this by making an empty Pose object in the callback routine:
#!/usr/bin/env python
import message_filters
import rospy
from laser_line_extraction.msg import LineSegmentList
from geometry_msgs.msg import Pose, Pose2D
from std_msgs.msg import Int32, Float32
rospy.init_node('simul-subscriber')
def callback(Pose2D, LineSegmentList):
pose = Pose()
pose.position.x = Pose2D.position.x
pose.position.y = Pose2D.position.y
pose.position.z = 0
#print(Pose2D, LineSegmentList, pose)
print(pose)
print(LineSegmentList)
line_segment_sub = message_filters.Subscriber('/line_segments', LineSegmentList)
pose_2D_sub = message_filters.Subscriber('/pose2D',Pose2D)
ts = message_filters.ApproximateTimeSynchronizer([line_segment_sub, pose_2D_sub], 10, 0.1, allow_headerless=True)
ts.registerCallback(callback)
rospy.spin()
Unfortunately, this gives a weird error when running this node:
[ERROR] [1535552711.709928, 1381.743000]: bad callback: <bound method Subscriber.callback of <message_filters.Subscriber object at 0x7f7af3cee9d0>>
Traceback (most recent call last):
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/topics.py", line 750, in _invoke_callback
cb(msg)
File "/opt/ros/kinetic/lib/python2.7/dist-packages/message_filters/__init__.py", line 75, in callback
self.signalMessage(msg)
File "/opt/ros/kinetic/lib/python2.7/dist-packages/message_filters/__init__.py", line 57, in signalMessage
cb(*(msg + args))
File "/opt/ros/kinetic/lib/python2.7/dist-packages/message_filters/__init__.py", line 287, in add
self.signalMessage(*msgs)
File "/opt/ros/kinetic/lib/python2.7/dist-packages/message_filters/__init__.py", line 57, in signalMessage
cb(*(msg + args))
File "/home/elisabeth/catkin_ws/src/hector_quadrotor/hector_quadrotor_demo/python_scripts/simul-subscriber.py", line 14, in callback
pose.position.x = Pose2D.position.x
AttributeError: 'LineSegmentList' object has no attribute 'position'
This is odd as the position attribute is only referenced for the Pose 2D and not the LineSegmentList msg. I suspect this is most a python issue than a ROS issue, any help somebody could give would be much appreciated!
I am following the example found at http://wiki.ros.org/message_filters where they took two different topics image and cameraInfo and passed them into the callback function
1 import message_filters
2 from sensor_msgs.msg import Image, CameraInfo
3
4 def callback(image, camera_info):
5 # Solve all of perception here...
6
7 image_sub = message_filters.Subscriber('image', Image)
8 info_sub = message_filters.Subscriber('camera_info', CameraInfo)
9
10 ts = message_filters.TimeSynchronizer([image_sub, info_sub], 10)
11 ts.registerCallback(callback)
12 rospy.spin()

You confuse class names with object names.
The fix to your program should be straight forward.
I've changed Pose2D to pose2d, and LineSegmentList to linesegmentlist where it was necessary and comented it with # --- Change ...:
#!/usr/bin/env python
import message_filters
import rospy
from laser_line_extraction.msg import LineSegmentList
from geometry_msgs.msg import Pose, Pose2D
from std_msgs.msg import Int32, Float32
rospy.init_node('simul-subscriber')
# --- CHANGE: using proper object names instread of class names
def callback(pose2d, linesegmentlist):
pose = Pose()
# --- CHANGE: using the object
pose.position.x = pose2d.position.x
pose.position.y = pose2d.position.y
pose.position.z = 0
#print(pose2d, linesegmentlist, pose)
print(pose)
print(linesegmentlist)
line_segment_sub = message_filters.Subscriber('/line_segments', LineSegmentList)
pose_2D_sub = message_filters.Subscriber('/pose2D',Pose2D)
ts = message_filters.ApproximateTimeSynchronizer([line_segment_sub, pose_2D_sub], 10, 0.1, allow_headerless=True)
ts.registerCallback(callback)
rospy.spin()

Django models - problem importing

I've refactored my models files into a module - this way it's much easier to maintain the code since it has grown quite a bit.
The funny thing is though that it won't work for one of the classes that references another class that references the fist one in it's turn:
UPD: the cycling references are confusing python and this is what the problem is caused by. This is easy to fix when you only reference other models from your model definition. However, Picture has methods that reference paperType class and vice versa - how can this be fixed?
Here's class Picture:
from django.db import models
from django.utils import simplejson
from picviewer.models import Collection, ImageSizeRatio, printSize
class Picture(models.Model):
name = models.TextField(null=False,blank=False,unique=False)
collection = models.ForeignKey(Collection)
popularity = models.IntegerField(default=0,unique=False)
isPurchasable = models.BooleanField(default=False)
allowBuyExclusive = models.BooleanField(default=False)
basePrice = models.DecimalField(decimal_places=2,max_digits=8)
imageSizeRatio = models.ForeignKey(ImageSizeRatio)
imageThumbnail = models.FileField(upload_to='pictures')
imagePreview = models.FileField(upload_to='pictures')
imageSmall = models.FileField(upload_to='pictures')
imageNormal = models.FileField(upload_to='pictures')
imageLarge = models.FileField(upload_to='pictures')
imageHuge = models.FileField(upload_to='pictures')
allowedPrintSize = models.ManyToManyField(printSize)
Here is printSize class that it references - you see it calls Picture functions to do some math around pictures of specified printSize:
from django.db import models
from picviewer.models import paperType
from picviewer.models import Picture
class printSize (models.Model):
name = models.CharField(null=False,blank=False,unique=True,max_length=60)
width = models.IntegerField(null=False,blank=False)
height = models.IntegerField(null=False,blank=False)
allowedPaperType = models.ManyToManyField(paperType)
#isActive = models.NullBooleanField(null=True, default=None)
def json(self, picture_id, base_price):
sizes_selector = printSize.objects.filter(picture__id = picture_id)
sizes = list()
for size in sizes_selector:
papers = list()
for paper in size.allowedPaperType.all():
cost_for_paper = Picture.objects.get(id=picture_id).calculatePrice(paper.id,size.id)
p = dict(id = paper.id,
name = paper.name,
description = paper.description,
price = paper.pricePerSqMeter.__str__(),
cost = "%.2f" % cost_for_paper)
papers.append(p)
s = dict(id = size.id,
name = size.name,
width = size.width,
height = size.height,
allowedPapers = papers)
sizes.append(s)
return sizes
now this is what I get in shell trying to import Picture:
>>> from picviewer.models import Picture
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "D:\~Sasha\eclipse_workspace\zavalen\picviewer\models\Picture.py", line 4, in <module>
from picviewer.models import Collection, ImageSizeRatio, printSize
File "D:\~Sasha\eclipse_workspace\zavalen\picviewer\models\printSize.py", line 4, in <module>
from picviewer.models import Picture
ImportError: cannot import name Picture
>>>
can I cure this? :)

To avoid cyclic imports, specify FK model as a string, e.g
collection = models.ForeignKey('Collection') # Collection is in the same module
or
collection = models.ForeignKey('myapp.Collection') # Collection is in another app

buildbot doesn't accept my MailNotifier's IEMailLookup object

A number of people in my organization have different email names from perforce names, so I need to create an IEmailLookup derivation that overrides getAddress to do my evil bidding:
(From my master.cfg)
class MyIEmailLookup:
from buildbot import interfaces
__implements__ = interfaces.IEmailLookup
def getAddresses(user):
address_dict = {"user1", "user_one#our_domain.com"}
try:
address = address_dict[user]
except KeyError:
address = user + "#our_domain.com"
return address
maillookup = MyIEmailLookup()
from buildbot.status import mail
c['status'].append(mail.MailNotifier(....
....
lookup=maillookup
))
I've tried any number of permutations, but I either get:
Traceback (most recent call last):
File "/Library/Python/2.6/site-packages/buildbot-0.8.3p1-py2.6.egg/buildbot/scripts/runner.py", line 1071, in doCheckConfig
ConfigLoader(configFileName=configFileName)
File "/Library/Python/2.6/site-packages/buildbot-0.8.3p1-py2.6.egg/buildbot/scripts/checkconfig.py", line 46, in __init__
self.loadConfig(configFile, check_synchronously_only=True)
File "/Library/Python/2.6/site-packages/buildbot-0.8.3p1-py2.6.egg/buildbot/master.py", line 727, in loadConfig
exec f in localDict
File "/Users/playbuilder/buildbot/master.cfg", line 207, in <module>
lookup=maillookup
File "/Library/Python/2.6/site-packages/buildbot-0.8.3p1-py2.6.egg/buildbot/status/mail.py", line 293, in __init__
assert interfaces.IEmailLookup.providedBy(lookup)
AssertionError
...or any other number of issues, dependant upon how I try to implement the IEmailLookup interface.
I'm using buildbot 0.8.3p1 and python 2.6.1.
I see precious few examples of how to do this, and every one of them fails in my context. What am I missing here?

I just solved this problem myself.
First you need to add (somewhere at the top of the file)
from zope.interface import implements
and then change
__implements__ = interfaces.IEmailLookup
to
if implements:
implements( interfaces.IEmailLookup )
else:
__implements__ = interfaces.IEmailLookup

If you want to fetch email from perforce user, you can use this class:
# .-----------------------.
# | Perforce Email Lookup |
# `-----------------------'
from twisted.internet import defer, utils
from buildbot.util import ComparableMixin
from buildbot.interfaces import IEmailLookup
from zope.interface import implements
import os
import re
class PerforceEmailLookup(ComparableMixin):
implements(IEmailLookup)
compare_attrs = ["p4port", "p4user", "p4passwd", "p4bin"]
env_vars = ["P4CLIENT", "P4PORT", "P4PASSWD", "P4USER",
"P4CHARSET"]
def __init__(self,
p4port = None,
p4user = None,
p4passwd = None,
p4bin = 'p4'):
self.p4port = p4port
self.p4user = p4user
self.p4passwd = p4passwd
self.p4bin = p4bin
self.email_re = re.compile(r"Email:\s+(?P<email>\S+#\S+)\s*$")
def _get_process_output(self, args):
env = dict([(e, os.environ.get(e)) for e in self.env_vars if os.environ.get(e)])
d = utils.getProcessOutput(self.p4bin, args, env)
return d
#defer.deferredGenerator
def getAddress(self, name):
if '#' in name:
yield name
return
args = []
if self.p4port:
args.extend(['-p', self.p4port])
if self.p4user:
args.extend(['-u', self.p4user])
if self.p4passwd:
args.extend(['-P', self.p4passwd])
args.extend(['user', '-o', name])
wfd = defer.waitForDeferred(self._get_process_output(args))
yield wfd
result = wfd.getResult()
for line in result.split('\n'):
line = line.strip()
if not line: continue
m = self.email_re.match(line)
if m:
yield m.group('email')
return
yield name
usage would look like:
c['status'].append(
MailNotifier(
sendToInterestedUsers = True,
mode = 'failing',
lookup = PerforceEmailLookup(
p4port = "perforce:1666",
p4user = "buildbot",
p4passwd = "buildbot")))

Try this:
from buildbot.interfaces import IEmailLookup
from buildbot.util import ComparableMixin
from zope.interface import implements
class lookup_example_email(ComparableMixin):
implements(IEmailLookup)
def getAddress(self,user):
return "%s#example.com"%(user)
...
mn = MailNotifier(..., lookup=lookup_example_email(), extraRecipients=m)

Here's the piece of code I use which works with buildbot 2.3.1 in python3.6.
from buildbot.interfaces import IEmailLookup
from buildbot.util import ComparableMixin
from zope.interface import implementer
#implementer(IEmailLookup)
class EmailMap(ComparableMixin):
def getAddress(self, name):
return f'{name}#xxxxx'