🌐 Mailman 3 February 2019 - 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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Remove soft line break
by Valerio Pachera March 16, 2019

March 16, 2019

I have a file with row that split at the 80th character. The next row start with a blank space, meaning that i part of the previous row. Example: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam non justo enim. Viv amus dapibus quis neque vitae ornare. Pellentesque at pharetra sapien, id eleif end lacus. Nullam ut semper enim, vulputate venenatis justo. Vestibulum vehicul a dolor sit amet ultricies vulputate. Aenean lobortis, nulla eu scelerisque hen What do you suggest to get the text on a single line?

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schedulers
by nathan tech March 4, 2019

March 4, 2019

Hi there, I recently started working on a backup program, and the one big feature everyone wants in backup programs is the ability to schedule backups, right? but I'm thinking, should I do this? def do_backup # backup code here, without prints to screen or anything so it just does it in the background... def scheduler(): global tus # tus=time until schedule while(time.time()>tus): time.sleep(5) scheduler() Is that wise? Is that how it should be done? This is a program for windows. Thanks! Nathan

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Exception not working as expected?
by Chip Wachob March 2, 2019

March 2, 2019

Hello, Python 2.7 & Windows and also Linux are the platforms being used. Running the code from the command line / terminal as python except.py. Note that it does work properly in Linux. So I'm guessing I need to test for a different exception along with the KeyboardInterrupt?? So, the code below is my example. When I run it, everything is fine until I attempt to test the KeyboardInterrupt exception. When I do this, the traceback is as follows: Traceback (most recent call last): File "except.py", line 71, in <module> start_menu() What I was expecting was the message in the exception to be displayed (" Keyboard Interrupt - Exiting "), then for the program to exit gracefully. I'm sure that this is a NOOB mistake, but I can't seem to figure out why the exception isn't being trapped and handled the way I had hoped. Can someone shed some light on this for me? Thank you, # import standard libraries import os import time import sys DISPLAY_TIME = 5 g_user_num_items = -1 def start_menu(): start_quit = False os.system('cls' if os.name == 'nt' else 'clear') print "\n\n\n\n Welcome to Test.\n" time.sleep(DISPLAY_TIME) try: while not start_quit: os.system('cls' if os.name == 'nt' else 'clear') print "\n +++ Test Start Menu +++" print "Enter the number of items to test," print "or, 0 for individual testing." print "Then press <Enter>\n" # wait for it... num_items = int(raw_input(": ")) if num_items == 0: # individual testing print "\nIndividual testing requested" g_user_num_items = num_items start_quit = True elif(num_items >= 1 and num_items <= 512): # multi testing g_user_num_items = num_items print "\nItem count of ", g_user_num_items, ", accepted!" start_quit = True else: # unexpected input eg A, >, ? etc print " Invalid number of items, please re-enter" time.sleep(DISPLAY_TIME / 2) ##### end item count input # detect ctrl-c except KeyboardInterrupt: # provides a clean exit print "\n\n Keyboard Interrupt - Exiting \n\n" time.sleep(5) # trap no choice, just Enter key cases except ValueError: # handles non-entry selections like 'Enter' print "Invalid selection please try again" time.sleep(DISPLAY_TIME / 2) start_menu() return ##### end main menu ############################################## # Main entry point into program # if __name__ == "__main__": start_menu() print "End of Script\n"

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ANSI / VT100 Escape Codes in Windows 7 Environment
by Chip Wachob Feb. 28, 2019

Feb. 28, 2019

Hello again, As always, this list has been very helpful, and thank you. So, I thought I was good to go until I attempted to run my code on a Windows 7 vintage machine this morning. The application is intended to be run in the command window in Windows, from the terminal in Linux... In the code I had included the ANSI escape characters so I could invert the text and change the color. Basically, I wanted to make the warning / error messages stand out from the crowd. Eg: # there's an error in the loop, report it # format reverse with yellow background print "\033[7m\033[33m" print " ERROR IN LOOP SIZE" . . . # clear formatting print "\033[m" As I have now learned, Windows 7 does not support this functionality. Development had been done on a Windows 10 (and Ubuntu) machine where this worked just fine. I've been spending the morning looking at different solutions. Many of them seem to involve either including yet aother module, or, worse (IMHO) a C library that will 'emulate' the ANSI escape sequences, API calls, etc. Before I go tearing into my currently working code, I'm looking for feedback from those much more experienced. I need this code to run correctly on both Windows 7 and 10 (future Linux) and I'm stuck with Python 2.7 due to other module limitations. What do the experts out there suggest as the path of least pain and suffering? Again, thank you for your time and guidance.

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Only appending one object to list, when I am expecting more than 1
by AdamC Feb. 28, 2019

Feb. 28, 2019

I'm creating lots of objects from json in a file. Part of reading the json back means that it iterates over the file and loads a json object and then creates the object from the dictionary. This is my file: {"name": "Dwarf Fortress", "platform": "steam", "dateAdded": "2019:02:25:16:56:1551113768", "tpe": "2019:02:21:13:49:1550756942"} {"name": "Jaws", "platform": "Netflix", "dateAdded": "2019:02:25:16:56:1551113768", "tpe": "2019:02:21:13:49:1550756960"} {"name": "Wargames", "platform": "CLI", "dateAdded": "2019:02:25:16:59:1551113984", "tpe": "Game"} and these are the functions that help load that file: media = [] def loadFile(): filename = input('Filename? ') f = open(filename, 'r') createObjects(f) def createObjects(f): '''Takes a file object and iterates through entries, passing them to create object, depending on what object it is.''' for line in f: count = count + 1 data = json.loads(line) print(type(data['tpe'])) name = data['name'] platform = data['platform'] dateAdded = data['dateAdded'] tpe = data['tpe'] if data['tpe'] == 'Game': a = createGame(name, platform, dateAdded,tpe) game = {a: tpe} media.append(game) if data['tpe'] == 'Film': a = createFilm(name, platform, dateAdded,tpe) film = {a: tpe} media.append(film) # For some reason I'm only getting one object at a time now when appending to media print(len(media)) def createGame(name, platform, dateAdded, tpe): return Game(name, platform, dateAdded) def createFilm(name, platform, dateAdded, tpe): return Film(name, platform, dateAdded) (This isn't the order that the functions are held in the module). Why would I only get one object in media, even though all three are created? Adam -- You back your data up on the same planet? http://kabads.monkeez.org <https://kabads.monkeez.org> PGP key: 0x7111B833

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Why does using "window.addchr()" to place a character at the lower right corner raise an exception?
by boB Stepp Feb. 28, 2019

Feb. 28, 2019

Under https://docs.python.org/3/library/curses.html#window-objects in the curses docs, it states: <quote> window.addch(ch[, attr]) window.addch(y, x, ch[, attr]) [...] Note Writing outside the window, subwindow, or pad raises a curses.error. Attempting to write to the lower right corner of a window, subwindow, or pad will cause an exception to be raised after the character is printed. </quote> Why is this? What is special about the lower right corner of a terminal window? I am guessing this is some relic of the original terminal era. TIA! -- boB

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I flip a coin 1 million times what is the consecutive times it will come up head and come up tails
by shaeffer＠q.com Feb. 27, 2019

Feb. 27, 2019

I am learning python. I wanted to test my ability by making a program to keep track of the flip of a coin to find how many consecutive times it came up heads and tails. Just want some criticism on what I have done. import random Hn = {} Tn = {} for i in range (0,31): vars()["Hn"+str(i)] = 0 for i in range (0,31): vars()["Tn"+str(i)] = 0 total_Heads = 0 total_tails= 0 tails_number = 0 Heads_number = 0 tries = 0 while tries < 10000: tries += 1 coin = random.randint(1, 2) # Flip coin if coin == 1: Heads_number += 1 # Incroment Heads count total_Heads += 1 if tails_number > 0 : vars()["Tn"+ str(tails_number)] += 1 # Incroment tails consecutive count tails_number = 0 if coin == 2: tails_number += 1 # Incroment Talies count total_tails += 1 if Heads_number > 0: vars()["Hn"+ str(Heads_number)] += 1 # Incroment Heads consecutive count Heads_number = 0 print (tries) print (total_tails, total_Heads) for i in range (30): print ('%-15s %-15s' %(("Tn"+str(i)+" "+str(eval("Tn"+str(i)))),("Hn"+str(i)+" "+str(eval("Hn"+str(i)))))) print out 100000000 50000259 49999741 Tn0 0 Hn0 0 Tn1 12497339 Hn1 12500186 Tn2 6257043 Hn2 6251565 Tn3 3120686 Hn3 3127257 Tn4 1563418 Hn4 1561175 Tn5 781938 Hn5 779381 Tn6 390943 Hn6 389768 Tn7 195569 Hn7 196513 Tn8 97091 Hn8 97858 Tn9 48717 Hn9 48745 Tn10 24493 Hn10 24429 Tn11 11966 Hn11 12237 Tn12 6070 Hn12 6062 Tn13 3021 Hn13 3039 Tn14 1540 Hn14 1556 Tn15 679 Hn15 726 Tn16 403 Hn16 389 Tn17 179 Hn17 206 Tn18 94 Hn18 105 Tn19 49 Hn19 45 Tn20 26 Hn20 24 Tn21 16 Hn21 13 Tn22 5 Hn22 2 Tn23 1 Hn23 3 Tn24 2 Hn24 3 Tn25 1 Hn25 2 Tn26 0 Hn26 0 Tn27 0 Hn27 0 Tn28 0 Hn28 0 Tn29 0 Hn29 0

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Doubt
by Maninath sahoo Feb. 27, 2019

Feb. 27, 2019

is it possible reverse inheritance? mean child class to parent class

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How to use "curses.resizeterm(nlines, ncols)"
by boB Stepp Feb. 25, 2019

Feb. 25, 2019

I am trying to understand the functionality that the Python module, curses, provides. But I am stuck on how to use the command, curses.resizeterm(nlines, ncols). At https://docs.python.org/3/library/curses.html#curses.resizeterm it says: <quote> curses.resizeterm(nlines, ncols)¶ Resize the standard and current windows to the specified dimensions, and adjusts other bookkeeping data used by the curses library that record the window dimensions (in particular the SIGWINCH handler). </quote> After much experimentation -- to no good effect -- I have concluded that "resizeterm" does *not* mean resize the terminal window that the curses program is running within. Can someone give me a working example of how to use this command? TIA! -- boB

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