Re: [Tutor] Numpy documentation
Hi Roger, My comments below, below yours. On Thu, Oct 04, 2018 at 12:02:01PM -0700, Roger Lea Scherer wrote: [...] > In the example pictured below, the array has 2 axes. The first axis has a > length of 2, the second axis has a length of 3. > [[ 1., 0., 0.], > [ 0., 1., 2.]] > > (I think) I understand the 2 axes. [1,0,0] (I'm lazy and don't want to type > the periods) is one axis and [0,1,2] is the second axis. You can copy and paste text to avoid extra typing. You seem to be are thinking along the lines of axles in a car, where the two axles run parallel: Axle one: - Axle two: - You should think of axes of a graph, which run perpendicular to each other, like the lines of a plus sign + or cross. So the array: [[ 1., 0., 0.], [ 0., 1., 2.]] is two dimensional, with 2 rows and 3 columns. In mathematics, we would call it a 2x3 matrix; in programming, it would be a 2x3 array. Axis one (rows): length 2 Axis two (columns): length 3 Regards, -- Steve ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Numpy documentation
On 04/10/18 20:02, Roger Lea Scherer wrote: > In the example pictured below, the array has 2 axes. The first axis has a > length of 2, the second axis has a length of 3. > [[ 1., 0., 0.], > [ 0., 1., 2.]] > > (I think) I understand the 2 axes. [1,0,0] (I'm lazy and don't want to type > the periods) is one axis and [0,1,2] is the second axis. Nope. Its the other way round. The first axis is the "column" of two rows. Hence length 2. The second axis is the row with 3 elements in each. If you look at it as a table you can access the elements using x,y coordinates. The x coordinate (being first) denotes which row is indicated and the y axis being second denotes the element within the row. > ...But why does the first axis have a length of 2? Because there are two rows. -- 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@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Numpy documentation
I truly don't think I'm this stupid, but I can't even understand the fourth paragraph of the numpy documentation. https://docs.scipy.org/doc/numpy/user/quickstart.html says: In the example pictured below, the array has 2 axes. The first axis has a length of 2, the second axis has a length of 3. [[ 1., 0., 0.], [ 0., 1., 2.]] (I think) I understand the 2 axes. [1,0,0] (I'm lazy and don't want to type the periods) is one axis and [0,1,2] is the second axis. But then things get goofy. The first axis has a length of 2. Is that because [1,0,0] and [0,1,2] are counted as one axis? (I think) I understand the second axis has a length of 3 because there are 3 elements within the [0,1,2] axis. Is that correct? But why does the first axis have a length of 2? Because the second zero doesn't count? Did they change the example and forgot to change the text? Thank you for your help as always. -- Roger Lea Scherer 623.255.7719 *Strengths:* Input, Strategic, Responsibility, Learner, Ideation ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Running programs that import 3rd party packages installed using pip.
On 04/10/18 15:15, Roger B. Atkins wrote: > That's very helpful, thanks. After reading the Tutor information last > night, I wrote a little program I named sysinfo. The code run line by > line in a Spyder console yields: > > In [3]: sys.path > Out[3]: > ['', > 'C:\\Users\\rba21\\Anaconda3\\python36.zip', > 'C:\\Users\\rba21\\Anaconda3\\DLLs', > 'C:\\Users\\rba21\\Anaconda3\\lib', > 'C:\\Users\\rba21\\Anaconda3', > 'C:\\Users\\rba21\\Anaconda3\\lib\\site-packages', Note that the interesting bit is what it looks like outside of Spyder. We know it works OK within Spyder it's what gets defined outside Spyder that matters. -- 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@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Running programs that import 3rd party packages installed using pip.
That's very helpful, thanks. After reading the Tutor information last night, I wrote a little program I named sysinfo. The code run line by line in a Spyder console yields: In [3]: sys.path Out[3]: ['', 'C:\\Users\\rba21\\Anaconda3\\python36.zip', 'C:\\Users\\rba21\\Anaconda3\\DLLs', 'C:\\Users\\rba21\\Anaconda3\\lib', 'C:\\Users\\rba21\\Anaconda3', 'C:\\Users\\rba21\\Anaconda3\\lib\\site-packages', 'C:\\Users\\rba21\\Anaconda3\\lib\\site-packages\\win32', 'C:\\Users\\rba21\\Anaconda3\\lib\\site-packages\\win32\\lib', 'C:\\Users\\rba21\\Anaconda3\\lib\\site-packages\\Pythonwin', 'C:\\Users\\rba21\\Anaconda3\\lib\\site-packages\\IPython\\extensions', 'C:\\Users\\rba21\\.ipython'] In [4]: sys.version Out[4]: '3.6.5 |Anaconda, Inc.| (default, Mar 29 2018, 13:32:41) [MSC v.1900 64 bit (AMD64)]' In [5]: sys.platform Out[5]: 'win32' I'll have to do more research to figure out which folders I need to add given that '\site-packages' is already included, but at least I won't be looking at the wrong path variable. On Thu, Oct 4, 2018 at 6:54 AM Mats Wichmann wrote: > > On 10/03/2018 09:20 PM, Roger B. Atkins wrote: > > System: Windows 10, Anaconda, Python 3, Spyder3 > > > > Problem: Running programs that import requests, pyperclip, bs4 and/or > > other modules from 3rd party packages works fine within Spyder IDE, > > but not from command line, or Win/R. The error message indicates no > > such module. Therefore, my programs crash at the import statement. In > > contrast, programs using built in modules work fine everywhere. > > Questions: Which file needs to be found? Is this a path problem? > > > > Efforts to solve problem: After making sure I had correctly typed the > > module names, my second guess was that it is a path problem, so I used > > win explorer to locate the module files. I also went to the command > > line and used "pip show modname". > > The search using win explorer revealed module files in multiple > > directories, so part of the problem may be that I don't know which > > file the import statement needs to be able to find. > > Based on results using pip show modname, the modules were installed in: > > Anaconda3\lib\site-packages. > > In fact, as shown in Win Explorer, they are in sub folders under > > \site-packages, and there are 'regular' py files as well as compiled > > files. (I'm a beginner, and thought Python was interpreted?) > > > > I changed my system path variable to include: > > C:\Users\rba21\Anaconda3\lib\site-packages# Result: same error message > > C:\Users\rba21\Anaconda3\lib\site-packages\pyperclip # Result: same > > error message > > I tried adding the sub folders down to __pycache__ but got the same > > error message. > > > > I did some web searches, but didn't find anything that enabled me to > > fix the problem. > > Write this simple program and run it from the "command line": > > import sys > print(sys.path) > > those are the places Python will look for modules when importing. you > can add to sys.path in your program, or if you define PYTHONPATH, its > contents will show up in sys.path. > > if you now do the same thing in a program running inside Spyder, you'll > probably see differences in sys.path. > > as Alan said, the system/user environment paths have nothing to do with > Python's module importing. > > > > > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Running programs that import 3rd party packages installed using pip.
Thanks! That helps. I'll have to go back to the drawing board, but you've put me on the right "path". On Thu, Oct 4, 2018 at 12:47 AM Alan Gauld via Tutor wrote: > > On 04/10/18 04:20, Roger B. Atkins wrote: > > System: Windows 10, Anaconda, Python 3, Spyder3 > > > > > I changed my system path variable to include: > > C:\Users\rba21\Anaconda3\lib\site-packages# Result: same error message > > When you say the "system path" do you mean the PYTHONPATH > variable? It's PYTHONPATH not PATH that determines where > Python looks for modules... > > Just a thought. > > > -- > 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@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Running programs that import 3rd party packages installed using pip.
On 10/03/2018 09:20 PM, Roger B. Atkins wrote: > System: Windows 10, Anaconda, Python 3, Spyder3 > > Problem: Running programs that import requests, pyperclip, bs4 and/or > other modules from 3rd party packages works fine within Spyder IDE, > but not from command line, or Win/R. The error message indicates no > such module. Therefore, my programs crash at the import statement. In > contrast, programs using built in modules work fine everywhere. > Questions: Which file needs to be found? Is this a path problem? > > Efforts to solve problem: After making sure I had correctly typed the > module names, my second guess was that it is a path problem, so I used > win explorer to locate the module files. I also went to the command > line and used "pip show modname". > The search using win explorer revealed module files in multiple > directories, so part of the problem may be that I don't know which > file the import statement needs to be able to find. > Based on results using pip show modname, the modules were installed in: > Anaconda3\lib\site-packages. > In fact, as shown in Win Explorer, they are in sub folders under > \site-packages, and there are 'regular' py files as well as compiled > files. (I'm a beginner, and thought Python was interpreted?) > > I changed my system path variable to include: > C:\Users\rba21\Anaconda3\lib\site-packages# Result: same error message > C:\Users\rba21\Anaconda3\lib\site-packages\pyperclip # Result: same > error message > I tried adding the sub folders down to __pycache__ but got the same > error message. > > I did some web searches, but didn't find anything that enabled me to > fix the problem. Write this simple program and run it from the "command line": import sys print(sys.path) those are the places Python will look for modules when importing. you can add to sys.path in your program, or if you define PYTHONPATH, its contents will show up in sys.path. if you now do the same thing in a program running inside Spyder, you'll probably see differences in sys.path. as Alan said, the system/user environment paths have nothing to do with Python's module importing. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] coding problem
On Wed, Oct 03, 2018 at 11:22:45PM -0500, ramanpreet baidwan wrote: > Can anyone tell me how to code to display permutations in a table for > all values of z=x^2+y by getting input from user for range of x and y? Yes. Use a text editor to write your code in a text file. When you save the file, use .py as the file extension, not .txt. Do you know how to program? It sounds like you are doing homework. You should start by showing us the code you have already written. If you have written no code at all, tell us what you know how to do and ask *specific* questions. Terrible question: "Can somebody do my home work for me?" Bad question: "How do I write this code?" Good question: "How do I write a for loop?" Excellent question: "I tried to write a for-loop from 1 to 5, but it only went to 4. Here is my code. What did I do wrong?" If you ask excellent questions, we can give you excellent answers. Do you know how to use print? Do you know how to get input from the user? Can you write a for-loop over a range from x to y? -- Steve ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] coding problem
On 04/10/18 05:22, ramanpreet baidwan wrote: > Can anyone tell me how to code to display permutations in a table > for all values of z=x^2+y by getting input from user for range of x and y? There are several problems with your question. First it sounds suspiciously like homework and we won't do that for you. (Although we will give you some pointers) Second permutations sounds like the wrong word. I suspect you just want all the solutions for z displayed in a table against x,y pairs. Is that correct? Next, taken literally, the problem is impossible since x,y have an infinite number of values. So to have any chance you need to define the quantum steps between x and y - integers, 0.1, 0.01, etc. Otherwise you need to draw a graphical representation rather than use a table. Finally, its not clear what you are asking for help with. Do you not know how to present output in a table format? Do you not know how to calculate z? Do you not know how to prompt the user for inputs? Do you not know how to generate the x,y values from the users input? It's best if you can write some code then send us that along with the output (including full error message, if any). Then ask a specific question about what is going wrong and how you want us to help. -- 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@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] coding problem
On 04/10/18 05:22, ramanpreet baidwan wrote: Can anyone tell me how to code to display permutations in a table for all values of z=x^2+y by getting input from user for range of x and y? Sorry but no as we do not do homework. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Running programs that import 3rd party packages installed using pip.
On 04/10/18 04:20, Roger B. Atkins wrote: > System: Windows 10, Anaconda, Python 3, Spyder3 > > I changed my system path variable to include: > C:\Users\rba21\Anaconda3\lib\site-packages# Result: same error message When you say the "system path" do you mean the PYTHONPATH variable? It's PYTHONPATH not PATH that determines where Python looks for modules... Just a thought. -- 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@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] coding problem
Can anyone tell me how to code to display permutations in a table for all values of z=x^2+y by getting input from user for range of x and y? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
[Tutor] Running programs that import 3rd party packages installed using pip.
System: Windows 10, Anaconda, Python 3, Spyder3 Problem: Running programs that import requests, pyperclip, bs4 and/or other modules from 3rd party packages works fine within Spyder IDE, but not from command line, or Win/R. The error message indicates no such module. Therefore, my programs crash at the import statement. In contrast, programs using built in modules work fine everywhere. Questions: Which file needs to be found? Is this a path problem? Efforts to solve problem: After making sure I had correctly typed the module names, my second guess was that it is a path problem, so I used win explorer to locate the module files. I also went to the command line and used "pip show modname". The search using win explorer revealed module files in multiple directories, so part of the problem may be that I don't know which file the import statement needs to be able to find. Based on results using pip show modname, the modules were installed in: Anaconda3\lib\site-packages. In fact, as shown in Win Explorer, they are in sub folders under \site-packages, and there are 'regular' py files as well as compiled files. (I'm a beginner, and thought Python was interpreted?) I changed my system path variable to include: C:\Users\rba21\Anaconda3\lib\site-packages# Result: same error message C:\Users\rba21\Anaconda3\lib\site-packages\pyperclip # Result: same error message I tried adding the sub folders down to __pycache__ but got the same error message. I did some web searches, but didn't find anything that enabled me to fix the problem. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
