The data file I am working with takes the format:
6345 Alfonso Chavez 98745.35
2315 Terry Kulakowski 234.0
4455 Yu Chen 78000.0
What I am trying to do is replace the balance(the last item in the line) with an updated balance which I have generated in my code. I'm not sure how to do this with an existing file without wiping the entire thing first, which is obviously not what I want. I was thinking a for loop to iterate over the line and split it into separate list elements, but that will update every users balance instead of the specific persons. Any help is appreciated.
If this is a text file, there is no great way of doing this. In general it's probably impossible/super hard to save changes in a text file without saving/rewriting the whole text file. Instead, what you should be focusing on is the fact that you need O(n) time to loop through the entire file looking for the specific person.
Having said all that, python module fileinput seems like a good way to do this. See this. You can set inplace=True to make it seem like you are just changing that single line in place.
But this is still O(n). It's just secretly rewriting the whole file for you behind your back.
Also some other solutions discussed here previously.
Related
Long story short, after a crash course in Python/BeautifulSoup, I managed to create a script to take an input text file that contains a list of URLs (1 on each line), scrape the URL, and write output to a database. There are some cases where I want an error to exit the script (including some trapped errors as well as unexpected), but as the list of URLs to scrape is pretty large, it would be handy if I could edit the input text file (or create a copy and edit that) to remove each URL as it is successfully processed. The idea being that if the script exits (by trap or crash), I'd have a list of the URLs left to be processed. Is something like this possible? I can find code samples to edit the text file, but I'm getting stuck at how to take out the row just processed.
Finally came across the post here that achieves the answer, though I'm not positive it's the most efficient way as it's reading the entire file and saving each time, but that may be the best that can be done in Python. In my case, the file is in the 1200 lines range, so it easily fits into memory.
I'd like to make a custom lasered label from a user's input on a website. I have a template dxf file and I'd like to replace placeholder text with the user input. My problem is the dxf file format is very unreadable in its text format. Is there any way to make sense of the numeric data? If not are there any other formats (svg, etc) that would be easier to work with?
EDIT: The reason I've found it unreadable in terms of text is that the program (Solidworks) converted the text to curves.) At this point I'm trying to figure out how to prevent that.
AutoDesk was nice enough to document DXF syntax in great detail. Spend a couple hours understanding the documentation from the link below, and I think you will find it quite easy to parse and edit using code.
To just replace some placeholder text, it should be just as simple as reading the DXF file into a string (a dxf file is no different than a txt file), performing a text replace operation and saving it back to file. Just make sure that your placeholder text is very unique and is not contained in any of the key words in the document below (otherwise your DXF file will get corrupted). Something like "PlaceHolderText" will do the trick.
http://images.autodesk.com/adsk/files/autocad_2012_pdf_dxf-reference_enu.pdf
Edit: More Info
I do a lot of work with AutoDesk Inventor which is in direct competition with SolidWorks, so they are effectively the same tool. We were faced with a similar problem of needing to place text onto sheet metal flat pattern DXFs that came out of Inventor in order to identify the part, but Inventor simply could not do it (see, exactly the same!). One of our developers had the idea to place a very precise geometry punch onto the flat pattern. After the DXF was generated he wrote some code that parsed the DXF file and replaced the geometry with a text entity. More specifically we used a triangle with sides having each length defined to something like the 7th decimal place. You can then use one of the vertices of the triangle to position the text, including rotation. This process would be automatic, so once you write the code with the help of the document above (which won't take the long), it will just work. If your engraver can handle text the way you want it, I'd say this is a very good solution. We generate hundreds of parts every day using this code. Hope this helps.
I'm making a file monitor for a folder where I download subtitles. So far, it works like this:
Look for new .rar files in the folder.
If found, extract the subtitles and delete the .rar file
If a single .srt file was extracted, save the file name to a variable.
Now, I'm clueless about how to achieve the next (and final) part of the script:
I want to find a pattern based on the way subtitles are named.
Let's say, the subtitles file can be something like this:
SomeShow.1x03.stuff.srt
some_show s01e03-stuff.srt
some show 1-03 stuff.srt
etc.
I want to get something like: SomeShow 1 3 and based on that, start the video with the name that matches that pattern, which I guess would be a matter of reversing the process that was used to get the Show, season and episode based on the name of the .srt file.
Is this possible at all? It'd be really simple stuff in most languages, but I really need this to be a .bat and I'm clueless about how to approach this... so far all I've managed to do is to remove the extension from the variable.
Thanks in advance.
Batch files are Turing complete - you can do anything in them, but it is usually not wise to go to extremes. You might be able to package a sed or grep or your own binary alongside your .bat file for a good compromise between batchiness and function. If you can assume a suitable operating system, you will have Powershell installed and go that route.
You should recognize that the task is not exactly defined and that the "solution" may need some tweaking and be never robust enough.
For this reason, the richer language you can pick, the further you will get.
I'm starting to learn about the io. functions, and am trying to implement them in my code. I've searched for the answer to this and nothing seems to give a clear cut yes or no, or at least I don't see one. I'm hoping someone here will know the answer and be able to help with this.
I'm wanting to create a text file that I can write to as time progresses. It'll basically be a log to which I'll be appending lines of output. Apparently io.open("textfile.txt") does not create the file, or so it appears.
Is there a way to create a text file in Lua that can later be accessed with io.read/write? Additionally, do I need to call io.close() before opening or creating a new text file? I appreciate any help given. Thanks!
You need to open the file for writing as follows: f=io.open("textfile.txt","w"). Then use f:write() to write stuff to it. When finished writing, call f:close().
I'm trying to localize a large MFC project where all the strings are hard-coded into the source code. (It was the easiest thing to do at the time, back before we had any idea we'd expand into other markets.) I've looked at localization tools, and invariably they say to put all the strings into the .rc file first, or just assume it has been done. Of the ones I've checked, appTranslator is the only one that even hints it may be a problem, and provides a couple of convenience functions to cut down on the wordiness of the resulting source code.
Does anybody have a better idea than going through hundreds of files manually, and making the occasional mistake along the way?
Is there some sort of product out there to help?
Does anybody have experience with doing this?
It is a tedious process to be sure. I participated in an effort like this many years ago. We did it manually. You can probably write some common code that makes the loading, checking, etc all pretty clean with minimal bloat.
I don't know of any products that will do it for you.
CStrings might be your friend - using the LoadString() member.
I would either derive from CString or write some other code that encapsulates default values (their current hard-coded values probably) and other error conditions and then use that in place of the hard-coded strings.
If you prefer not to use CString, then deriving from std::string and using the global LoadString() works fine too.
as for tools:
not sure they will work for your case:
http://www.modelmakertools.com/articles/hard-coded-strings.html
apparently this tool can find all the strings in your exe files:
http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx
Then you can search for them and replace.
I think writing a tool would be fairly straightforward - look for " character and then create an entry in an rc file that corresponds to the .cpp or .h file it came from. You will have a lot of culling to do, but it is a start. You can do a replace of the text, or insert comments, etc. You can use the line number and file name for the resource id/name in a #include.
I know it's too late but just for the search engine.
There is a feature of CString to initialize it from a resource ID.
CString((LPCTSTR)IDS_RESOURCE_ID)