🌐 Mailman 3 November 2016 - Tutor - python.org

Scripting Calligra sheets with Python
by Jim Byrnes Jan. 31, 2022

Jan. 31, 2022

I am trying to script Calligra Sheets (formerly KSpread) with python. I have gotten some of the included example scripts to run so I know python scripting is running. I found the following snippet on their website: import KSpread sheet = KSpread.view().sheet() # swap text of B5 and C6 t1 = sheet.text("B5") t2 = sheet.text(6,3) sheet.setText("B5", t2) sheet.setText(6, 3, t1) # swap value of D7 and E8 v1 = sheet.value("D7") v2 = sheet.value(8,5) sheet.setValue("D7", v2) sheet.setValue(8, 5, v1) Error: 'str' object has no attribute 'text' File "file:///usr/share/kde4/apps/sheets/scripts/extensions/myswap.py", line 4, in <module> This error message appeared in a dialog box. I've taught myself some Python but I don't understand what is happening here. Shouldn't t1 be a sheet object? What would cause it to be a str instead? Thanks, Jim

5 8

Desktop Notifications on Linux
by Dharmit Shah June 29, 2017

June 29, 2017

Hi all, I am trying to create a script that will go through the /var/log/secure file on a Linux system and provide desktop notifications for failed login attempts. Here is the code - http://pastebin.com/MXP8Yd91 And here's notification.py - http://pastebin.com/BhsSTP6H I am facing issue in the function "new_attempts_from_last". I am not able to raise a desktop notification from this function. It always fails with this traceback - http://pastebin.com/cgHMScv3 I see this error only when I try to raise a notification from the aforementioned function. If I run test examples under /usr/share/doc/notify-python/examples, it works just fine. Also, if I try to raise a notification from under if __name__ == "__main__":, it works without any issues. So I don't think there's any issue with OS's notification daemon. Running from python shell like below also works fine: In [1]: import notification In [2]: notification.notification("Hey") What am I missing or doing wrong here? If it matters, I am running Fedora 20, python 2.7 and Cinnamon desktop environment. For readability purposes, I have provided pastebin links. Let me know if this is not the correct way. Regards, Dharmit.

3 3

Ran into a problem: Tried many different methods
by Parish Watteau Nov. 30, 2016

Nov. 30, 2016

The Springfork Amateur Golf Club has a tournament every weekend. The club president has asked you to write two programs: A program that will read each player’s name and golf score as keyboard input, and then save these as records in a file named golf.txt. (Each record will have a field for the player’s name and a field for the player’s score.) I attempted to solve it but ran into some errors from using some methods from a different python version but it didn't turn out the right way. Now I am stuck without a program and no where to start. Any help would be appreciated

3 2

Re: [Tutor] Help on Software Design decisions
by Juan C. Nov. 29, 2016

Nov. 29, 2016

On Tue, Nov 29, 2016 at 7:12 AM, Alan Gauld via Tutor <tutor(a)python.org> wrote: > I just noticed the last bit. > Is this a client side API or a server side API? > In other words are you building a set of services on the > server or are you building a module that makes it easy > for client side programs to access the server? I had > assumed the first but your responses make me think it > is probably the second. Client side. I'm building a python package to make it easier for my programs to get data from Moodle. > OK, In that case you possibly want to call your class > Users since you seem to intend to fetch all User objects at once? > Or is the User ID doing double duty as a security token for > the server and as a key into the data? Or should it look like: I just need username and password to login, nothing else. I'm passing 'program_id' as an argument to make it easier for me, but I intend to automatically get it in the future. Here's my working code: package moodle/ user.py #!/usr/bin/env python # -*- coding: utf-8 -*- from .program import Program import requests class User: _AUTH_URL = 'http://lms.university.edu/moodle/login/index.php' def __init__(self, username, password, program_id): self.username = username self.password = password session = requests.session() session.post(self._AUTH_URL, {"username": username, "password": password}) self.program = Program(program_id=program_id, session=session) def __str__(self): return self.username + ':' + self.password def __repr__(self): return '<User %s>' % self.username def __eq__(self, other): if isinstance(other, self): return self.username == other.username else: return False ========== program.py #!/usr/bin/env python # -*- coding: utf-8 -*- from .unit import Unit from bs4 import BeautifulSoup class Program: _PATH = 'http://lms.university.edu/moodle/course/index.php?categoryid=' def __init__(self, program_id, session): response = session.get(self._PATH + str(program_id)) soup = BeautifulSoup(response.text, 'html.parser') self.name = soup.find('ul', class_='breadcrumb').find_all('li')[-2].text.replace('/', '').strip() self.id = program_id self.units = [Unit(int(item['data-categoryid']), session) for item in soup.find_all('div', {'class': 'category'})] def __str__(self): return self.name def __repr__(self): return '<Program %s (%s)>' % (self.name, self.id) def __eq__(self, other): if isinstance(other, self): return self.id == other.id else: return False ========== unit.py #!/usr/bin/env python # -*- coding: utf-8 -*- from .course import Course from bs4 import BeautifulSoup class Unit: _PATH = 'http://lms.university.edu/moodle/course/index.php?categoryid=' def __init__(self, unit_id, session): response = session.get(self._PATH + str(unit_id)) soup = BeautifulSoup(response.text, 'html.parser') self.name = soup.find('ul', class_='breadcrumb').find_all('li')[-1].text.replace('/', '').strip() self.id = unit_id self.courses = [Course(int(item['data-courseid']), session) for item in soup.find_all('div', {'class': 'coursebox'})] def __str__(self): return self.name def __repr__(self): return '<Unit %s (%s)>' % (self.name, self.id) def __eq__(self, other): if isinstance(other, self): return self.id == other.id else: return False ========== course.py #!/usr/bin/env python # -*- coding: utf-8 -*- from .assignment import Assignment import re from bs4 import BeautifulSoup class Course: _PATH = 'http://lms.university.edu/moodle/course/view.php?id=' def __init__(self, course_id, session): response = session.get(self._PATH + str(course_id)) soup = BeautifulSoup(response.text, 'html.parser') self.name = soup.find('h1').text self.id = course_id self.assignments = [Assignment(int(item['href'].split('id=')[-1]), session) for item in soup.find_all('a', href=re.compile(r'http://lms \.university\.edu/moodle/mod/assign/view.php\?id=.*'))] def __str__(self): return self.name def __repr__(self): return '<Course %s (%s)>' % (self.name, self.id) def __eq__(self, other): if isinstance(other, self): return self.id == other.id else: return False ========== assignment.py #!/usr/bin/env python # -*- coding: utf-8 -*- from bs4 import BeautifulSoup class Assignment: _PATH = 'http://lms.university.edu/moodle/mod/assign/view.php?id=' def __init__(self, assignment_id, session): response = session.get(self._PATH + str(assignment_id)) soup = BeautifulSoup(response.text, 'html.parser') self.name = soup.find('h2').text self.id = assignment_id def __str__(self): return self.name def __repr__(self): return '<Assignment %s (%s)>' % (self.name, self.id) def __eq__(self, other): if isinstance(other, self): return self.id == other.id else: return False ========== test.py #!/usr/bin/env python # -*- coding: utf-8 -*- from moodle.user import User my_user = User('john.smith', '3uper$secret', 12) print(my_user) # print: john.smith:3uper$secret print(my_user.program) # print: Computer Science print(my_user.program.units) # print: [<Unit Math Fundamentals (59)>, <Unit Programming (102)>] print(my_user.program.units[-1].courses) # print: [<Course Programming Logic (666)>, <Course Data Modeling (667)>, <Course Python 1 (668)>, <Course Python 2 (669)>, <Course Project (670)>] print(my_user.program.units[-1].courses[-1].assignments) # print: [<Assignment A1 [mandatory] (40817)>, <Assignment A2 (40824)>, <Assignment A3 [mandatory] (40831)>, <Assignment A4 (40838)>, <Assignment A5 [mandatory] (40845)>, <Assignment Final Assignment [mandatory] (40882)>]

1 0

Help on Software Design decisions
by Juan C. Nov. 29, 2016

Nov. 29, 2016

I'm a student and my university uses Moodle as their learning management system (LMS). They don't have Moodle Web Services enabled and won't be enabling it anytime soon, at least for students. The university programs have the following structure, for example: 1. Bachelor's Degree in Computer Science (duration: 8 semesters) 1.1. Unit 01: Mathematics Fundamental (duration: 1 semester) 1.1.1. Algebra I (first 3 months) 1.1.2. Algebra II (first 3 months) 1.1.3. Calculus I (last 3 months) 1.1.4. Calculus II (last 3 months) 1.1.5. Unit Project (throughout the semester) 1.2. Unit 02: Programming (duration: 1 semester) 1.2.1. Programming Logic (first 3 months) 1.2.2. Data Modelling with UML (first 3 months) 1.2.3. Python I (last 3 months) 1.2.4. Python II (last 3 months) 1.2.5. Unit Project (throughout the semester) Each course/project have a bunch of assignments + one final assignment. This goes on, totalizing 8 (eight) units, which will make up for a 4-year program. I have to build my own Moodle API to be consumed by my program, currently I'm using 'requests' + 'bs4' to do the job. I'm not here for coding help, instead I have some python software design doubts. Some information I have in mind: - I was thinking about having the following classes: Program, Unit, Course, Assignment, User. - User would handle auth + session, the rest is pretty straightforward, program would handle programs, unit would handles units, and so on. - Inside Program init there would be attributes title, id and units; inside Unit init there would be attributes title, id and courses; inside Course init there would be attributes title, id, due_date, submitted, grade. Should I call the site using requests and do all the parsing for everything using bs4 as soon as I create a new instance of User? For example: user = User('john.smith', 'password') # will get all data needed user.program # <Program 'Computer Science' (10260)> cs = user.program cs.units # <Unit 'Mathematics Fundamental' (1405)>, <Unit 'Programming' (1413)>, etc. prog = cs.units[1] prog.assignments # <Assignment 'Assignment 01' (200)>, <Assignment 'Assignment 02' (201)>, <Assignment 'Assignment 03' (202)>, <Assignment 'Assignment 04' (203)>, [...], <Assignment 'Final Assignment' (210)> as03 = cs.assignments[2] as03.title # ''Assignment 03" as03.id # 202 as03.due_date # 2016-11-30T21:21:00+00:00 (ISO 8601) Is this a good Pythonic design? If not, how could it be better?

2 3

how to move an executable into path
by Benjamin Fishbein Nov. 28, 2016

Nov. 28, 2016

Everything was going fine with my selenium webdriver programs, but then today I updated to Firefox 50. Everything stopped working. So I updated to selenium 3, hoping this would work. But apparently I need something called geckodriver. I managed to download this, but it’s in the wrong place: in my downloads folder. So here’s what happens when I try to do anything with selenium: >>> from selenium import webdriver >>> driver=webdriver.Firefox() Traceback (most recent call last): File "<pyshell#342>", line 1, in <module> driver=webdriver.Firefox() File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/firefox/webdriver.py", line 135, in __init__ self.service.start() File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/common/service.py", line 71, in start os.path.basename(self.path), self.start_error_message) WebDriverException: Message: 'geckodriver' executable needs to be in PATH. So I’m not sure where the geckodriver file needs to go. Can it be anywhere on the path? could I just put it in the site-packages folder for example? And here’s the big problem: all of these folders are hidden, and I have no idea how to get into them. I’m on a mac and using python2.7. I should probably learn how to handle paths and file systems, etc., but right now I just want to get my programs running again. Any help is greatly appreciated. -Ben

4 5

Help with Python Queue
by anish singh Nov. 26, 2016

Nov. 26, 2016

I was just writing to read a file using popen and wanted to use queue along with it. I have below code but it is giving this error: AttributeError: Queue instance has no attribute 'taskdone' import threading from Queue import Queue def worker(q): while True: dataset = q.get() print("q is taken out") q.taskdone() def create_data(q): print("Inside create data") output = [1, 2, 3] for i in output: print("Inside", i) print("queue is put") q.put(i) if __name__ == '__main__': q = Queue() t = threading.Thread(target=worker, args=(q,)) t.daemon = True t.start() create_data(q) q.join()

4 3

inquiry
by zxjhust1 Nov. 26, 2016

Nov. 26, 2016

| Dear tutors: I have some questions about memory mechanism of python. Do the elements of the parent go into the namespace of the subclass when we define subclass? As far as I'm concerned, they do go into the namespace of the subclass. Because when we use dir(), we can see all the elements. But there is only one 'update' name. I think the function of the subclass override the parent's. In this situation , when we instantiate the subclass, we just need one argument, that is to say, the parent's update function do the work. It confuses me. According to my understanding, as there is no 'super' key word, the 'self' should inference to the instance of the subclass when we initiate the subclass. So self.__update should inference to function of the subclass. Another quesion is about the meaning of the private variables. What condition shall we use them? In other word, I wanna know the purpose of introducing the private variables. The above-mentioned example, I think, is not enough to explain it, because when we change the __update to update, there is no change except for using update rather than _Mapping__update to inference it. The last question is about the storage of the data. For a given data, like 1 or '1', what's the form when python saves it in the memory? To be more specific, I wanna know the number of the parts we use to enclose it. For example, python uses 3 parts to save it. One is for the value. The second for the type of the data, ie, inter,str,etc. The last is for the pointer or id to show the place where it is stored. Hope to hear from you soon. Have a good weekend! Yours, sincerely. Phoenix |

3 2

Parsing a String
by Bryon Adams Nov. 25, 2016

Nov. 25, 2016

Hello, I have written a script that pulls certain bits of information out of a Cisco router's 'show version' command. The output is given in the assignment and it does work on several different routers (I tested 3 different models from work). What I did seems a bit messy to me though, would I be able to get a second opinion here? Code in it's entirety is below. I did this using Python3.5.2 on Fedora 25. #!/usr/bin/env python3 ################################################################ # November 24, 2016 # # Take the given string for 'show version' on a Cisco router # # and return the following information: # # vendor, model, os_version, uptime, serial number # # Code should be generic and work on other versions. # # # ################################################################ sh_ver = ''' Cisco IOS Software, C880 Software (C880DATA-UNIVERSALK9-M), Version 15.0(1)M4, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2010 by Cisco Systems, Inc. Compiled Fri 29-Oct-10 00:02 by prod_rel_team ROM: System Bootstrap, Version 12.4(22r)YB5, RELEASE SOFTWARE (fc1) twb-sf-881 uptime is 7 weeks, 5 days, 19 hours, 23 minutes System returned to ROM by reload at 15:33:36 PST Fri Feb 28 2014 System restarted at 15:34:09 PST Fri Feb 28 2014 System image file is "flash:c880data-universalk9-mz.150-1.M4.bin" Last reload type: Normal Reload Last reload reason: Reload Command Cisco 881 (MPC8300) processor (revision 1.0) with 236544K/25600K bytes of memory. Processor board ID FTX1000038X 5 FastEthernet interfaces 1 Virtual Private Network (VPN) Module 256K bytes of non-volatile configuration memory. 126000K bytes of ATA CompactFlash (Read/Write) License Info: License UDI: ------------------------------------------------- Device# PID SN ------------------------------------------------- *0 CISCO881-SEC-K9 FTX1000038X License Information for 'c880-data' License Level: advipservices Type: Permanent Next reboot license Level: advipservices Configuration register is 0x2102 ''' import sys # New empty dictionary to store information. router_dict = {} # Get vendor, although we know it's Cisco anyway. if 'Cisco' in sh_ver: router_dict['vendor'] = 'Cisco' else: sys.exit('This is not a Cisco device') # Split sh ver output to a list of lines lines = sh_ver.split('\n') # Get the IOS version, this parses for the string 'Cisco IOS Software', # in every line in 'lines.' It then splits the string stored in position # 0 and returns position 2 as the os version and strips off the leading # space. router_dict['os_ver'] = [i for i in lines if 'Cisco IOS Software' in i][0].split(',')[2][1:] # Get the model of router using the same logic as the IOS version. The line # doesn't have a nice split character so I rebuilt the string using spaces. router_dict['model'] = ' '.join([i for i in lines if 'bytes of memory' in i][0].split()[0:3]) # Get uptime using the same logic as 'model' router_dict['uptime'] = ' '.join([i for i in lines if 'uptime' in i][0].split()[3:]) # Get serial number using the logic from 'os_ver' router_dict['serial'] = [i for i in lines if 'Processor board ID' in i][0].split()[3] for i in router_dict: print('{:<10} {}'.format(i, router_dict.get(i))) Thanks, Bryon

1 1

Python code
by urfa jamil Nov. 25, 2016

Nov. 25, 2016

I need help to write a code for this problem. Please help Ask the user to enter a series of numbers. Stop reading numbers when they enter a negative number. Calculate the average of the numbers given not including the final negative number. Question 9 options: With best regards urfa jamil

4 3