[Tutor] How to foreach over a dynamic number of levels
I'm probably trying to go about this the wrong way - so I'm asking more for what direction to head in, at least. The group I'm working with has a python program (the Model Framework) that runs data through a number of models. For each possible step, there are multiple possible models. Each run also is for a single date. So the ini for Model Framework might be something like this: step1 = step1model-a step2 = step2model-a step3 = step3model-b step4 = step4model-a (so for any given step, one or more models exist. For a Model Framework run, you choose one model for any given step you choose to run) The program I'm working on will drive the framework and run it multiple times. For example, to run a range of dates; but also, to run a range of models - so you might want to run models a-h on days Jan1-Jan30 - that would be 8 times 30 = 240 runs. The program I'm working on needs to be Framework-agnostic. That is, I know that the framework's ini file consists of a number of key and value pairs, but my program has no concept of what these values *do*, or which ones *exist*. The end-user will basically take a Framework ini file, and change some values from strings to lists, for example: step1=["step1model-a","step1model-b","step1model-c"] My program will parse that, and know that it must iterate three times because of that line alone. So I do not know in advance how many keys I will have, nor how many of them will be arrays vs. strings, although my initial thought is that I can treat strings like single-member arrays - I don't care if I foreach a single time - execution time on that order of magnitude is irrelevant. I'm really not sure how in the world to accomplish this. The best method I can think of would involve somehow iterating through and generating code to exec, but frankly I don't even have that as a complete working solution. The other thought would be a function that called itself, but that is also very very ugly. I come from PHP, where you have variable variables. I think that would help me a lot here - I could at least dynamically nest my arrays, and call my arrays using variable vars. I'm definitely a pretty new programmer. I don't mind reading - but I've spent about 6 hours today googling for terms like "dynamic nesting" and found a lot of interesting stuff - but no clear direction to head in. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] How to foreach over a dynamic number of levels
I'm probably trying to go about this the wrong way - so I'm asking more for what direction to head in, at least. The group I'm working with has a python program (the Model Framework) that runs data through a number of models. For each possible step, there are multiple possible models. Each run also is for a single date. So the ini for Model Framework might be something like this: step1 = step1model-a step2 = step2model-a step3 = step3model-b step4 = step4model-a (so for any given step, one or more models exist. For a Model Framework run, you choose one model for any given step you choose to run) The program I'm working on will drive the framework and run it multiple times. For example, to run a range of dates; but also, to run a range of models - so you might want to run models a-h on days Jan1-Jan30 - that would be 8 times 30 = 240 runs. The program I'm working on needs to be Framework-agnostic. That is, I know that the framework's ini file consists of a number of key and value pairs, but my program has no concept of what these values *do*, or which ones *exist*. The end-user will basically take a Framework ini file, and change some values from strings to lists, for example: step1=["step1model-a","step1model-b","step1model-c"] My program will parse that, and know that it must iterate three times because of that line alone. So I do not know in advance how many keys I will have, nor how many of them will be arrays vs. strings, although my initial thought is that I can treat strings like single-member arrays - I don't care if I foreach a single time - execution time on that order of magnitude is irrelevant. I'm really not sure how in the world to accomplish this. The best method I can think of would involve somehow iterating through and generating code to exec, but frankly I don't even have that as a complete working solution. The other thought would be a function that called itself, but that is also very very ugly. I come from PHP, where you have variable variables. I think that would help me a lot here - I could at least dynamically nest my arrays, and call my arrays using variable vars. I'm definitely a pretty new programmer. I don't mind reading - but I've spent about 6 hours today googling for terms like "dynamic nesting" and found a lot of interesting stuff - but no clear direction to head in. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] KeyError: 'DEFAULT'
http://python.pastebin.com/m26864a1b Traceback (most recent call last): File "./loopy", line 328, in set[current_set][current_section][current_key] = current_value KeyError: 'DEFAULT' First, apologies for the formatting - I'm teaching myself python after having taught myself PHP, so I probably make amateur mistakes. I'm currently working in a 120-character-wide environment for my own purposes, with plans to perhaps change this later. The purpose of this program, as it stands now, is to read an INI file and parse it, line by line. Doing this by hand because my program will take the INI file and generate multiple INI files for another program, and loop through them (hence "Loopy" - I didn't come up with the name.) My "Loopy" commands are lines in the INI that begin with a colon, e.g. ":SET=somename" starts a new set. Lines 294-335 are where I've determined that the input line contains a key-value pair. Well, I should backtrack. "set" contains not only the various sets, but I track where I'm at in set["+current+"] - I have to track the current set and section (INI section, e.g. [DEFAULT]). So what I'm trying to do on line 328 is to store the current key/value pair in a dictionary under the proper section, which is in the proper set. Hence, set[setname][section][key]=value You can see my insanely-verbose log here: http://python.pastebin.com/m6dcfb96d That was from a run where I commented out line 328. (that dos the actual Googling "KeyError" seems to indicate problems while trying to *retrieve* values from a dictionary, whereas I'm trying to *set* values. Does anyone have any insight? Also, although I'm not formally requesting feedback on my coding style, that's mainly because I don't want to waste anyone's time. But if you have suggestions, please - I'm open. I'm self-taught and I'm sure I'm doing lots of stupid things. I just hope it's not all bad. ;-) Thank you most sincerely, -Isaac Eiland-Hall ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
