🌐 Mailman 3 March 2017 - 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

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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.

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Using venv
by Jim May 29, 2017

May 29, 2017

It has been suggested to me that I should use a virtual environment and venv would be a good choice. I've read through PEP405 and this link [1]. Though some of it seems a little confusing to me, I'm sure I can get it up and running. This question seems a little dumb and maybe I am being a little dense, but then what? Your program/script is done how do you run it? Do you always have to activate your venv and run it from there? I like to run Tkinter programs from a launcher. Would that be possible and what would the command look like? Lately I have been writing some Libreoffice calc macros and evaluating pyspread for it's macro capability. Would modules installed in my venv be available to the spreadsheet programs? Thanks, Jim [1] https://realpython.com/blog/python/python-virtual-environments-a-primer/

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Validating String contains IP address
by Ed Manning April 3, 2017

April 3, 2017

What's the best way to validate a string contains a IP address Sent from my iPad

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python gtk serial loop thread readind data close
by Alexandru Achim April 1, 2017

April 1, 2017

Dear users, I had a problem regarding Threads in python and Gtk3. I want to stop a while loop in Gtk , a loop starded with a thread. I want to control a delay timer laser board with give me ,when I send a command by serial connection, give back continuous status values ; but I want to stop this loop , to modify parameters and start the loop again. A part of my code is here : import serial import threading import gi gi.require_version('Gtk', '3.0') from gi.repository import Gtk from gi.repository import GObject,Pango, GLib from threading import Thread GObject.threads_init()............. #START BUTTON def start(self,button_start): Thread(target=self.start_on,args=(self.button_start)) def start_on(self,widget,data=None): if ser.isOpen(): cmd = 's' ser.write(cmd.encode('ascii')+'\r\n') while True: try: values = ser.readline() self.label_result.set_text(values) except: pass #STOP BUTTON def stop(self,button_stop): Thread(target=self.stops,args=(button_stop)).start() def stops(self,widget,data=None): if ser.isOpen(): try: cmd = 'f' ser.write(cmd.encode('ascii')+'\r\n') status = ser.readline() self.label_result.set_text(status) except: pass ...........win=sincrolaser() win.show_all() Gtk.main() But the problem is when I send STOP button program freeze , probably the loop from the start is looping forever. How do I stop the start thread? Is there a posibility to give a thread flag or identity to find him and close? Thank you,Alex --------- Eng.ALEXANDRU ACHIM National Institute for Lasers, Plasma and Radiation Physics Center for Advance Laser Technologies - PW Laser Facility

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Function question
by Peter O'Doherty April 1, 2017

April 1, 2017

Hi, Apologies for the very basic question but could anyone explain the behaviour of these two functions (in Python3.5)? def myFunc(num): for i in range(num): print(i) print(myFunc(4)) 0 1 2 3 None #why None here? def myFunc(num): for i in range(num): return i print(myFunc(4)) 0 #why just 0? Many thanks, Peter

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subprocess.Popen / proc.communicate issue
by bruce March 31, 2017

March 31, 2017

Trying to understand the "correct" way to run a sys command ("curl") and to get the potential stderr. Checking Stackoverflow (SO), implies that I should be able to use a raw/text cmd, with "shell=true". If I leave the stderr out, and just use s=proc.communicate() the test works... Any pointers on what I might inspect to figure out why this hangs on the proc.communicate process/line?? I'm showing a very small chunk of the test, but its the relevant piece. Thanks . . . cmd='[r" curl -sS ' #cmd=cmd+'-A "Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0"' cmd=cmd+"-A '"+user_agent+"'" ##cmd=cmd+' --cookie-jar '+cname+' --cookie '+cname+' ' cmd=cmd+' --cookie-jar '+ff+' --cookie '+ff+' ' #cmd=cmd+'-e "'+referer+'" -d "'+tt+'" ' #cmd=cmd+'-e "'+referer+'" ' cmd=cmd+"-L '"+url1+"'"+'"]' #cmd=cmd+'-L "'+xx+'" ' try_=1 while(try_): proc=subprocess.Popen(cmd, shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE) s,err=proc.communicate() s=s.strip() err=err.strip() if(err==0): try_='' . . . the cmd is generated to be: cmd=[r" curl -sS -A 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; yie8)' --cookie-jar /crawl_tmp/fetchContentDir/12f5e67c_156e_11e7_9c09_3a9e85f3c88e.lwp --cookie /crawl_tmp/fetchContentDir/12f5e67c_156e_11e7_9c09_3a9e85f3c88e.lwp -L 'http://www6.austincc.edu/schedule/index.php?op=browse&opclass=ViewSched&ter…'"] test code hangs, ctrl-C generates the following: ^CTraceback (most recent call last): File "/crawl_tmp/austinccFetch_cloud_test.py", line 3363, in <module> ret=fetchClassSectionFacultyPage(a) File "/crawl_tmp/austinccFetch_cloud_test.py", line 978, in fetchClassSectionFacultyPage (s,err)=proc.communicate() File "/usr/lib64/python2.6/subprocess.py", line 732, in communicate stdout, stderr = self._communicate(input, endtime) File "/usr/lib64/python2.6/subprocess.py", line 1328, in _communicate stdout, stderr = self._communicate_with_poll(input, endtime) File "/usr/lib64/python2.6/subprocess.py", line 1400, in _communicate_with_poll ready = poller.poll(self._remaining_time(endtime)) KeyboardInterrupt This works from the cmdline: curl -sS -A 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; yie8)' --cookie-jar /crawl_tmp/fetchContentDir/12f5e67c_156e_11e7_9c09_3a9e85f3c88e.lwp --cookie /crawl_tmp/fetchContentDir/12f5e67c_156e_11e7_9c09_3a9e85f3c88e.lwp -L 'http://www6.austincc.edu/schedule/index.php?op=browse&opclass=ViewSched&ter…'

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reading files in Python 3
by Rafael Knuth March 31, 2017

March 31, 2017

I can read files like this (relative path): with open("Testfile_B.txt") as file_object: contents = file_object.read() print(contents) But how do I read files if I want to specify the location (absolute path): file_path = "C:\Users\Rafael\Testfile.txt" with open(file_path) as file_object: contents = file_object.read() print(contents) The above does not work ...

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Extract Block of Data from a 2D Array
by Stephen P. Molnar March 31, 2017

March 31, 2017

I have a block of data extracted from a quantum mechanical calculation: CARTESIAN COORDINATES (A.U.) ---------------------------- NO LB ZA FRAG MASS X Y Z 0 C 6.0000 0 12.011 -3.265636 0.198894 0.090858 1 C 6.0000 0 12.011 -1.307161 1.522212 1.003463 2 C 6.0000 0 12.011 1.213336 0.948208 -0.033373 3 N 7.0000 0 14.007 3.238650 1.041523 1.301322 4 C 6.0000 0 12.011 -5.954489 0.650878 0.803379 5 C 6.0000 0 12.011 5.654476 0.480066 0.013757 where the number of lines depends upon the molecule being considered. I want to extract the block of data starting on line 4 and column 4. Unfortunately, the only programming language in which I used to be competent in is Fortran. I have attempted researching this problem, but have only succeeded in increasing my mental entropy. Help will be much appreciated. Thanks in advance. -- Stephen P. Molnar, Ph.D. Life is a fuzzy set www.molecular-modeling.net Stochastic and multivariate (614)312-7528 (c) Skype: smolnar1

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All Entry Boxes taking the same value
by Pooja Bhalode March 31, 2017

March 31, 2017

Hi, I am working on a GUI application where I have a multiple number of entry boxes and I created a loop for the label and entry boxes depending upon the number of times it needs to be shown. However, I tried assigning different values to each label and entry boxes in the for loop using lists, so that I can save different values obtained from the entry boxes in the entry lists and use them later. *However, when I execute it, and type something in one entrybox, it shows in all the entry boxes using multi-cursor option. * Can someone please tell me how I can avoid this error? I am trying to put a for loop since I need to create the gui such that the number of times it needs to be done would be unknown. Hence, the way I went about this was to take an upper limit of 3 and thus, reacoriginal = [" ", " ", " "]. This can be used as an upper limit and the required number can thus fit in as needed. Here, for example, I have taken the required number as two. this would be later modified. Code: from Tkinter import * root = Tk() root.geometry("500x350") # Variables: reacoriginal = [" ", " ", " "] conca = [1,0,0] print conca[0] concunit = [" ", " ", " "] concunit11 = StringVar() concunit21 = StringVar() concunit31 = StringVar() conca1 = IntVar() conca1.set(1) concb1 = IntVar() concc1 = IntVar() average = [" ", " ", " "] lowest = [" ", " ", " "] highest = [" ", " ", " "] averageformulation = [" ", " ", " "] lowestformulation = [" ", " ", " "] highestformulation = [" ", " ", " "] print average reactants = ["A", "B", "C"] for i in range(len(reactants)): Label(root, text = "Experimental Range").grid(row = 0, column = 0, sticky = W) labeldown = Label(root, text = "For Parameter Estimation") labeldown.grid(row = 1, column = 0, sticky = W) labeldown.config(state='disable') Label(root, text = "Average ").grid(row = 2, column = 1, sticky = W) Label(root, text = "Lowest ").grid(row = 2, column = 2, sticky = W) Label(root, text = "Highest").grid(row = 2, column = 3, sticky = W) Label(root, text = "Units").grid(row = 2, column = 4, sticky = W) Checkbutton(root, text = reactants[i], variable = conca[i]).grid(row = 3+i, column = 0, sticky = W) optionlist2 = [u'\u03bcmol/L', 'mmol/L','mol/L'] concunitdrop = OptionMenu(root, concunit[i], *optionlist2) concunitdrop.config(width = 8) concunitdrop.grid(row = 3+i, column = 4, sticky = W) for i in range(len(reactants)): *Entry*(root, textvariable =* average[i]*, width = 15, state=DISABLED).grid(row = 3+i, column = 1, sticky = W) *Entry*(root, textvariable = *lowest[i]*, width = 15).grid(row = 3+i, column = 2, sticky = W) *Entry*(root, textvariable = *highest[i]*, width = 15).grid(row = 3+i, column = 3, sticky = W) root.mainloop()

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