🌐 Mailman 3 December 2014 - 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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Option on How to create web Interface
by fabu desay March 8, 2016

March 8, 2016

If I got the problem correctly,you can equally create + open a file file = open(filename,+wr) The file should have the HTML extension You can now pace your web contents in the file.html you created that should work by trigering the python file you programed in and it inturn creates the website or pages of your choice an example like this could help webpage = open('index.html', 'w+') webpage.write("<html><head><title>My web page</title></head>"); webpage.write("<body>This the body</body></html>"); webpage.close()

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HELP I need help with Python Setup or to reach Marilyn Davis
by carolynn fryer July 11, 2015

July 11, 2015

I am at the point where I am just spinning my wheels. I tried to get help with logging on but so far I am just getting frustrated. I have a problem that I brought up the first night in class but couldn't seem to get help then. Sorry if I am at the point where I am totally frustrated and I need HELP. PLEASE. I did not turn in homework because of the fact that I can not run anything without getting a syntax error. I tried setting up a path for python environment variables and a few other things but I am getting no where. Can you give me some suggestions why I can't run anything. I have windows 7 on my home computer, and windows 8 on my laptop and they are both doing the same thing. So it has to be something I am doing or not doing. I really do not like being behind/late in anything so that is making me even more frustrated. I suppose I am even more frustrated and afraid to ask because I kink of got a slap in the face last time I took a course here and the instructor would not help. But that was a way different situation, I simply could not understand his English and then he told me he did not have any patience. Excuse me but I just about died when he, an INSTRUCTOR told me that. I worked at Stanford for 25 years and to hear an instructor say those words was unthinkable. Anyway you can maybe understand my reluctance to ask for help but I need help. Any suggestions?? When I use one of the computers at school everything works just fine. Except I can not get my own computer to log on when I am there. So again that is why I said it is my system and something in my set up that I don't have. Sorry for the long note, I was just letting out a little frustration. LOL Thx for any suggestions, Carolynn Fryer ps: I know this is not the proper way to get ahold of you but I could not find nor have time to find any other way. The UCSC system is not very user friendly

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Wave module
by Alex Krycek Feb. 12, 2015

Feb. 12, 2015

Hello, I'm trying to join two .wav files with the wave module. But when I try to use wave.open(filename, "rb") I receive the following error: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "F:\PortablePython1.0\lib\wave.py", line 483, in open return Wave_read(f) File "F:\PortablePython1.0\lib\wave.py", line 162, in __init__ self.initfp(f) File "F:\PortablePython1.0\lib\wave.py", line 143, in initfp self._read_fmt_chunk(chunk) File "F:\PortablePython1.0\lib\wave.py", line 264, in _read_fmt_chunk raise Error, 'unknown format: %r' % (wFormatTag,) wave.Error: unknown format: 85 I read somewhere that there are various wave formats, only some supported by Python. Is this true? If so, is there any way I can convert my wave files into a supported kind? Thanks!

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Making Doubly Linked List with Less Lines of Code.
by WolfRage Jan. 16, 2015

Jan. 16, 2015

I wrote some code recently to make a linked list of Nodes for a 2d graph, so it consists of rows and columns. Now I wanted to make the code support being doubly linked, forwards and backwards. The difficult part of this is that the links are per row and per column. But the code I think is overly bloated. I am currently working on reducing the complexity of it. If any one has the time to look at it, if you have ideas for how I can re-write it to be much smaller I would appreciate the information. If you need more code let me know, but I tried to condense it since this singular function is around 325 lines of code. Thank you. The function to make the linked list: def make_linked_lists(self): previous_row_node = None previous_col0_node = None previous_col1_node = None previous_col2_node = None previous_col3_node = None previous_col4_node = None previous_col5_node = None previous_col6_node = None previous_col7_node = None current_node = None self.tile_list = list() for row in range(0, self.rows): for col in range(0, self.cols): current_node = self.get_instance_of_id(str(col) + ',' + str(row)) self.tile_list.append(current_node) if row == 0: if col == 0: self.row0 = current_node self.col0 = current_node previous_col0_node = current_node elif col == 1: self.col1 = current_node previous_col1_node = current_node elif col == 2: self.col2 = current_node previous_col2_node = current_node elif col == 3: self.col3 = current_node previous_col3_node = current_node elif col == 4: self.col4 = current_node previous_col4_node = current_node elif col == 5: self.col5 = current_node previous_col5_node = current_node elif col == 6: self.col6 = current_node previous_col6_node = current_node elif col == 7: self.col7 = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node current_node.prev_row_node = previous_row_node previous_row_node = current_node elif row == 1: if col == 0: self.row1 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node current_node.prev_col_node = previous_col0_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node current_node.prev_col_node = previous_col1_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node current_node.prev_col_node = previous_col2_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node current_node.prev_col_node = previous_col3_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node current_node.prev_col_node = previous_col4_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node current_node.prev_col_node = previous_col5_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node current_node.prev_col_node = previous_col6_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node current_node.prev_col_node = previous_col7_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node elif row == 2: if col == 0: self.row2 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node elif row == 3: if col == 0: self.row3 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node elif row == 4: if col == 0: self.row4 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node elif row == 5: if col == 0: self.row5 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node elif row == 6: if col == 0: self.row6 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node elif row == 7: if col == 0: self.row7 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node elif row == 8: if col == 0: self.row8 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node elif row == 9: if col == 0: self.row9 = current_node previous_row_node = None previous_col0_node.next_col_node = current_node previous_col0_node = current_node elif col == 1: previous_col1_node.next_col_node = current_node previous_col1_node = current_node elif col == 2: previous_col2_node.next_col_node = current_node previous_col2_node = current_node elif col == 3: previous_col3_node.next_col_node = current_node previous_col3_node = current_node elif col == 4: previous_col4_node.next_col_node = current_node previous_col4_node = current_node elif col == 5: previous_col5_node.next_col_node = current_node previous_col5_node = current_node elif col == 6: previous_col6_node.next_col_node = current_node previous_col6_node = current_node elif col == 7: previous_col7_node.next_col_node = current_node previous_col7_node = current_node if previous_row_node is not None: previous_row_node.next_row_node = current_node previous_row_node = current_node

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Convert string to bytes
by shweta kaushik Dec. 31, 2014

Dec. 31, 2014

Hi all, I need help on this problem. I have one message packet in form of string s = '0xFE, 0x01, 0x01, 0x22, 0xFE, 0x02'. I have to send this data to MSP430 microcontroller, but it is not taking data if it is string. If I am passing this as hardcoded value s1 = 0xFE, 0x01, 0x01, 0x22, 0xFE, 0x02 then board is responding. I want to convert s as s1 using python. Please help me out to convert string in normal format for microcontroller to respond. Thanks in advance. Regards, Shweta

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Help on Python drop-down list options
by Tammy Miller Dec. 31, 2014

Dec. 31, 2014

Hello All, I need help on the following: I have a created a project from a csv file to calculate the mean and standard deviation. However, I would like to create a drop-down list and display the mean and standard deviation? Is there a module for that? Thank you, Tammy

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Re: [Tutor] [OT] Best Practices for Scientific Computing
by Albert-Jan Roskam Dec. 30, 2014

Dec. 30, 2014

----------------------------- On Tue, Dec 30, 2014 12:34 PM CET Alan Gauld wrote: >On 29/12/14 23:50, Patti Scott wrote: >> Could someone clarify "Modularize code rather than copying and pasting?" > >Joel and Danny have given the basic answer in terms of putting >loose code into functions. But it goes a little further too. > >You can be tempted to copy/paste functions because they almost >do what you want but not quite (maybe the take a list of values >and you want to use a dictionary). Its easy to copy the function >and change all the numerical indexes into keys and use the >dictionary. But it would be better to change the original function >so that it can work with both, if possible. This usually involves >representing the variations in behaviour as parameters in the >function (usually with defaults to retain the original semantics). But isn't there a point where you break the 'law' that a function should have one and only one goal? At a certain point you end up with a big fat juicy function that not only takes dicts and lists, but also scratches your back, does the laundry,... >Another case might be where you have a bunch of functions that operate on a global data structure. Then you want to have a second similar data structure but you can't use the functions on it because they access >the existing global. You could copy/paste the functions and change the data reference. But it would be better to either add the data structure reference to the functions as a parameter, or you create a class that has the data as an internal instance attribute. > >Finally, you might have some code in a program that you want to use in another program. But you can't just import the first program because >it runs all sorts of other stuff you don't need. So you just copy >out the functions you want. Or you could put the loose code into a function (main() usually) and call that within a Say you have a file 'helpers.py' that contains functions that you might use across projects. How do you only display the functions that you actually used in your (Sphinx) documentation of a particular project? >if __name__ === "__main__": main() > >line in your original program, turning it into a reusable module >which you can now safely import. > >So modularize can have several meanings, it applies to any >mechanism used to bundle up code for reuse. The point being that reusing code, whether as a function, module or class, is more >flexible and reliable than copy/pasting it. > >PS. >Note that reuse is not universally a good thing, it does >have negative aspects too, in test and maintenance costs >and, often, in performance impact. I often use python for data analysis. I would be afraid that a modification to a generic function for project B would affect the results of project A (which may be long-running analysis). Hmmm, maybe 'git submodule' would be useful here. But in the vast majority >of cases the positives vastly outweigh the negatives. > >HTH >-- Alan G >Author of the Learn to Program web site >http://www.alan-g.me.uk/ >http://www.amazon.com/author/alan_gauld >Follow my photo-blog on Flickr at: >http://www.flickr.com/photos/alangauldphotos > > >_______________________________________________ >Tutor maillist - Tutor(a)python.org >To unsubscribe or change subscription options: >https://mail.python.org/mailman/listinfo/tutor

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[OT] Best Practices for Scientific Computing
by Albert-Jan Roskam Dec. 30, 2014

Dec. 30, 2014

Hi, I thought this might be worth sharing, especially on a windy, rainy Friday evnening: http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.1001… Here are the best practices mentioned in the article: Write programs for people, not computers. A program should not require its readers to hold more than a handful of facts in memory at once. Make names consistent, distinctive, and meaningful. Make code style and formatting consistent. Let the computer do the work. Make the computer repeat tasks. Save recent commands in a file for re-use. Use a build tool to automate workflows. Make incremental changes. Work in small steps with frequent feedback and course correction. Use a version control system. Put everything that has been created manually in version control. Don't repeat yourself (or others). Every piece of data must have a single authoritative representation in the system. Modularize code rather than copying and pasting. Re-use code instead of rewriting it. Plan for mistakes. Add assertions to programs to check their operation. Use an off-the-shelf unit testing library. Turn bugs into test cases. Use a symbolic debugger. Optimize software only after it works correctly. Use a profiler to identify bottlenecks. Write code in the highest-level language possible. Document design and purpose, not mechanics. Document interfaces and reasons, not implementations. Refactor code in preference to explaining how it works. Embed the documentation for a piece of software in that software. Collaborate. Use pre-merge code reviews. Use pair programming when bringing someone new up to speed and when tackling particularly tricky problems. Use an issue tracking tool. Have a great weekend! Regards, Albert-Jan ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, a fresh water system, and public health, what have the Romans ever done for us? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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