🌐 Mailman 3 January 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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Recommended Resurce or strategy for beginning students
by Matthew Polack Feb. 21, 2019

Feb. 21, 2019

Hi All, In our growing school we're teaching Python programming for the first time as an elective subject with Year 9 and 10 students. (Had a dabble at this last year with 3 students in Year 11) I'm wondering what specific resource or stategy people would recommend for absolute beginners? ie. a course or program, book,...set of activities to follow that strategically introduces and develops key skills. At this age level I don't think we need to be achieving 'rocket science'..but rather giving the students a good solid introduction. Some of the leadership wanted me to use this programming in combination with building robots...I've even wondered whether this is trying to achieve too many things...and we're better off focused on programming itself... but am open to this idea too... I've had a play with using the excellent PySimpleGUI...which is an excellent resource for building a GUI...but I've realised before doing too much of this we might need to get a grip on core fundamentals.... The challenge is trying to find a way to making this 'fun' for students whilst also having them genuinely learn rather than just 'copying pasting' code...achieving something that looks good...but not really understanding what they are doing. So far my strategy will be: 1.) Establish some core basics(utlising some form of 'course',,,which goes through basics of syntax..variables...loops etc. utilising just raw code...(probably a simple 'Adventure Game') 2.) Build some simple programs using PySimple GUi..eg. Some quiz games etc. (there are some great examples on Github by another teacher and also the author Mike of PySimpleGUI. 3.) Possibly explore robotics. Can anyone make any recommendations on either resources or teaching/learning strategy/curriculum. Thank you, Matt Matthew Polack | Teacher [image: Emailbanner3.png] Trinity Drive | PO Box 822 Horsham Victoria 3402 p. 03 5382 2529 m. 0402456854 e. matthew.polack(a)htlc.vic.edu.au w. www.htlc.vic.edu.au -- **Disclaimer: *Whilst every attempt has been made to ensure that material contained in this email is free from computer viruses or other defects, the attached files are provided, and may only be used, on the basis that the user assumes all responsibility for use of the material transmitted. This email is intended only for the use of the individual or entity named above and may contain information that is confidential and privileged. If you are not the intended recipient, please note that any dissemination, distribution or copying of this email is strictly prohibited. If you have received this email in error, please notify us immediately by return email or telephone +61 3 5382 2529** and destroy the original message.*

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How to get Selenium to wait for page load
by mhysnm1964＠gmail.com Feb. 1, 2019

Feb. 1, 2019

Hi all, I have found an excellent article on identifying stale elements. The issue is when I try and use their example code. I get a failure where for_wait is not defined. http://www.obeythetestinggoat.com/how-to-get-selenium-to-wait-for-page-load- after-a-click.html Traceback (most recent call last): File "<stdin>", line 5, in <module> NameError: name 'wait_for' is not defined >>> When I look through the examples. I only find one reference for the above function. But it doesn't look correct and I am confused. The author indicates the definition of the function is half way up the page. As I cannot see, this reference doesn't help. So can someone help and provide the definition for this method/function? The code which generated the error: rows = [] pageNav = browser.find_element_by_id("center-5") curr_page = pageNav.find_element_by_css_selector('span .pageNumberElement').text prev_page = "" while prev_page in curr_page: # wait_for(link_has_gone_stale): prev_page = curr_page rows.extend(tableNavigation (pageNav)) if wait_for(link_has_gone_stale): pageNav = browser.find_element_by_id("center-5") curr_page = pageNav.find_element_by_css_selector('span .pageNumberElement').text if prev_page == curr_page: print ("Page no has not changed:",curr_page) else: prev_page = curr_page

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Webinterface for python script
by Asad Jan. 30, 2019

Jan. 30, 2019

Hi All , I have created certain python scripts to analyze log files and suggest solution based on logic which I invoke on the command line . I need some information on how to execute these through browser . I am using : python test.py file1 file2 How do I use the browser to upload the files file1 and file2 and it process the files . Please advice , Thanks, --

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Not able to get to Script Mode
by jetspacejt Jan. 29, 2019

Jan. 29, 2019

Using version 3.7.1 Where is File Edit Shell...etc. Not at the top of my screen

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Re: [Tutor] python-files
by Asad Jan. 28, 2019

Jan. 28, 2019

Hi All , I tried the following code : parser = argparse.ArgumentParser() parser.add_argument("first") parser.add_argument("second", nargs="?") args = parser.parse_args() print("first:", args.first) print("second:", args.second) When I execute the script it gives error : python python_json_20001_oratest_v1.py "file1" ('first:', 'file1') ('second:', None) Traceback (most recent call last): File "test.py", line 211, in <module> with open(args.second, 'r') as f : TypeError: coercing to Unicode: need string or buffer, NoneType found if I see in line number 211 it with open(args.second, 'r') as f : try : with open(args.second, 'r') as f : for line in f: print line except IOError: print "The default error is err-1 because file2 was not provided " Does that mean my try and except block is not working because if args.second is None as in this case then it should print "The default error is err-1 because file2 was not provided " Please advice , Thanks, > ---------- Forwarded message ---------- > From: Peter Otten <__peter__(a)web.de> > To: tutor(a)python.org > Cc: > Bcc: > Date: Sun, 27 Jan 2019 10:30:12 +0100 > Subject: Re: [Tutor] python - files > Cameron Simpson wrote: > > > Mats has mentioned the modules getopt and argparse etc. These are > > primarily aimed at option parsing ("-v", "-o foo"). Your situation > > occurs _after_ the option parsing (in your case, there are no options). > > Not argparse. The main advantage over optparse is its handling of > positional > arguments. Your custom logic > > > def main(argv): > > cmd = argv.pop(0) # collect the command word > > badopts = False > > # mandatory first argument > > if not argv: > > print("%s: missing first argument" % cmd, file=sys.stderr) > > badopts = True > > else: > > first = argv.pop(0) > > # optional second argument > > if argv: > > second = argv.pop(0) # explicit argument 2, use it > > else: > > second = None # or some otherdefault > > if argv: > > print("%s: extra arguments: %r" % (cmd, argv), file=sys.stderr) > > badopts = true > > if badopts: > > print("%s: invalid invocation, aborting" % cmd, file=sys.stderr) > > return 2 > > ... work with first and second ... > > can roughly be replicated with the two lines > > parser.add_argument("first") > parser.add_argument("second", nargs="?") > > A working script: > > $ cat test.py > #!/usr/bin/python3 > import argparse > > def main(): > parser = argparse.ArgumentParser() > > parser.add_argument("first") > parser.add_argument("second", nargs="?") > > args = parser.parse_args() > > print("first:", args.first) > print("second:", args.second) > > if __name__ == "__main__": > main() > > $ ./test.py > usage: test.py [-h] first [second] > test.py: error: the following arguments are required: first > > $ ./test.py -h > usage: test.py [-h] first [second] > > positional arguments: > first > second > > optional arguments: > -h, --help show this help message and exit > > $ ./test.py ONE > first: ONE > second: None > > $ ./test.py ONE TWO > first: ONE > second: TWO > > $ ./test.py ONE TWO THREE > usage: test.py [-h] first [second] > test.py: error: unrecognized arguments: THREE > > Argparse makes a usable standard command line interface easy to set up (if > you need non-standard behaviour it gets a bit harder). > > There is also a companion module argcomplete (not in the stdlib) that > enables autocompletion. > > > > > > > ---------- Forwarded message ---------- > From: Cameron Simpson <cs(a)cskk.id.au> > To: tutor(a)python.org > Cc: > Bcc: > Date: Sun, 27 Jan 2019 20:54:13 +1100 > Subject: Re: [Tutor] python - files > On 27Jan2019 10:30, Peter Otten <__peter__(a)web.de> wrote: > >Cameron Simpson wrote: > >> Mats has mentioned the modules getopt and argparse etc. These are > >> primarily aimed at option parsing ("-v", "-o foo"). Your situation > >> occurs _after_ the option parsing (in your case, there are no options). > > > >Not argparse. The main advantage over optparse is its handling of > positional > >arguments. > > I stand corrected. > > >Your custom logic > [...] > >can roughly be replicated with the two lines > > > >parser.add_argument("first") > >parser.add_argument("second", nargs="?") > >[... extended example ...] > > Thank you! > > Cheers, > Cameron Simpson <cs(a)cskk.id.au> > > > > > ---------- Forwarded message ---------- > From: Marco Mistroni <mmistroni(a)gmail.com> > To: mhysnm1964(a)gmail.com > Cc: tutor(a)python.org > Bcc: > Date: Sun, 27 Jan 2019 10:46:06 +0000 > Subject: Re: [Tutor] Web scraping using selenium and navigating nested > dictionaries / lists. > Hi my 2 cents. Have a look at scrapy for scraping.selenium is v good tool > to learn but is mainly to automate uat of guis > Scrapy will scrape for you and u can automate it via cron. It's same stuff > I am doing ATM > Hth > > On Sun, Jan 27, 2019, 8:34 AM <mhysnm1964(a)gmail.com wrote: > > > All, > > > > > > > > Goal of new project. > > > > I want to scrape all my books from Audible.com that I have purchased. > > Eventually I want to export this as a CSV file or maybe Json. I have not > > got > > that far yet. The reasoning behind this is to learn selenium for my > work > > and get the list of books I have purchased. Killing two birds with one > > stone > > here. The work focus is to see if selenium can automate some of the > > testing I have to do and collect useful information from the web page for > > my > > reports. This part of the goal is in the future. As I need to build my > > python skills up. > > > > > > > > Thus far, I have been successful in logging into Audible and showing the > > library of books. I am able to store the table of books and want to use > > BeautifulSoup to extract the relevant information. Information I will > want > > from the table is: > > > > * Author > > * Title > > * Date purchased > > * Length > > * Is the book in a series (there is a link for this) > > * Link to the page storing the publish details. > > * Download link > > > > Hopefully this has given you enough information on what I am trying to > > achieve at this stage. AS I learn more about what I am doing, I am adding > > possible extra's tasks. Such as verifying if I have the book already > > download via itunes. > > > > > > > > Learning goals: > > > > Using the BeautifulSoup structure that I have extracted from the page > > source for the table. I want to navigate the tree structure. > BeautifulSoup > > provides children, siblings and parents methods. This is where I get > stuck > > with programming logic. BeautifulSoup does provide find_all method plus > > selectors which I do not want to use for this exercise. As I want to > learn > > how to walk a tree starting at the root and visiting each node of the > tree. > > Then I can look at the attributes for the tag as I go. I believe I have > to > > set up a recursive loop or function call. Not sure on how to do this. > > Pseudo > > code: > > > > > > > > Build table structure > > > > Start at the root node. > > > > Check to see if there is any children. > > > > Pass first child to function. > > > > Print attributes for tag at this level > > > > In function, check for any sibling nodes. > > > > If exist, call function again > > > > If no siblings, then start at first sibling and get its child. > > > > > > > > This is where I get struck. Each sibling can have children and they can > > have > > siblings. So how do I ensure I visit each node in the tree? > > > > Any tips or tricks for this would be grateful. As I could use this in > other > > situations. > > > > > > > > Sean > > > > _______________________________________________ > > Tutor maillist - Tutor(a)python.org > > To unsubscribe or change subscription options: > > https://mail.python.org/mailman/listinfo/tutor > > > > _______________________________________________ > Tutor maillist - Tutor(a)python.org > https://mail.python.org/mailman/listinfo/tutor > -- Asad Hasan +91 9582111698

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Web scraping using selenium and navigating nested dictionaries / lists.
by mhysnm1964＠gmail.com Jan. 27, 2019

Jan. 27, 2019

All, Goal of new project. I want to scrape all my books from Audible.com that I have purchased. Eventually I want to export this as a CSV file or maybe Json. I have not got that far yet. The reasoning behind this is to learn selenium for my work and get the list of books I have purchased. Killing two birds with one stone here. The work focus is to see if selenium can automate some of the testing I have to do and collect useful information from the web page for my reports. This part of the goal is in the future. As I need to build my python skills up. Thus far, I have been successful in logging into Audible and showing the library of books. I am able to store the table of books and want to use BeautifulSoup to extract the relevant information. Information I will want from the table is: * Author * Title * Date purchased * Length * Is the book in a series (there is a link for this) * Link to the page storing the publish details. * Download link Hopefully this has given you enough information on what I am trying to achieve at this stage. AS I learn more about what I am doing, I am adding possible extra's tasks. Such as verifying if I have the book already download via itunes. Learning goals: Using the BeautifulSoup structure that I have extracted from the page source for the table. I want to navigate the tree structure. BeautifulSoup provides children, siblings and parents methods. This is where I get stuck with programming logic. BeautifulSoup does provide find_all method plus selectors which I do not want to use for this exercise. As I want to learn how to walk a tree starting at the root and visiting each node of the tree. Then I can look at the attributes for the tag as I go. I believe I have to set up a recursive loop or function call. Not sure on how to do this. Pseudo code: Build table structure Start at the root node. Check to see if there is any children. Pass first child to function. Print attributes for tag at this level In function, check for any sibling nodes. If exist, call function again If no siblings, then start at first sibling and get its child. This is where I get struck. Each sibling can have children and they can have siblings. So how do I ensure I visit each node in the tree? Any tips or tricks for this would be grateful. As I could use this in other situations. Sean

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python - files
by Asad Jan. 27, 2019

Jan. 27, 2019

Hi All , I would like to know how do I make and option file as an argument on command propmnt in python . At present I using : if len(sys.argv) == 3: first = sys.argv[1] second = sys.argv[2] else: print "enter the second argument" It works well for the following command : python test.py file1 file2 However I have another case where only file1 may be present so file1 is mandatory for this script to run however file2 is optionnal : if len(sys.argv) == 2: first_log = sys.argv[1] second_log = sys.argv[2] pthon test.py file1 It gives error : second_log = sys.argv[2] IndexError: list index out of range How do I acheive this because if python test.py file1 file2 then I would process both files . If python test.py file1 is given then I would process file1 using the variable first_log . Please advice . Thanks,

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asking questions
by Mats Wichmann Jan. 24, 2019

Jan. 24, 2019

Just for a bit of amusement, one of the scenarios we see here is famous enough it has its very own website: http://xyproblem.info/ enjoy :)

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ssl verification failed error
by Riley Harris Jan. 24, 2019

Jan. 24, 2019

When I try to install packages in python this error occurs. I have found a way around this by using: pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org <package_name> but this only works when the error is while installing packages. Now I am trying to access a dataset from Quandl and it returns the same error. I don’t know what the core problem is or how to fix it. Or I at least need to know a way to get around it when accessing data sets and such. Sent from Mail for Windows 10

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