[Tutor] using python for parsing
Hi, I know practically nothing about python. I know how to install it and all that kind of stuff. I want to use python for parsing a text file. The task is to read in a text file, and write out another text file that is written in some particular way using the data from the file that was read in. The question is how do I go about this? What part of python documentation, or a book I should read etc. I dont want to start reading a python book from the first page. I just want to do this parsing task and I will learn about whatever I need to as I encounter it. Thank you for the help. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] using python for parsing
Hi, So I am able to read in a file, and write out a file from python. I have some question about the text manipulation that I need to do between reading in a file and spitting out another. Couple of things I would like to do, are: if the first character of a line is a comma, I would like to delete the newline character at the end of the previous line and make a longer line (one line followed by another without a newline in between); if the first character of the line is an exclamation mark, I would like to delete that line altogether. So for instance, if the input file text looks like the following, one, two, three , four, five, six ! This is a comment seven, eight, nine I would like to output a file the text in which looks like one, two, three, four, five, six seven, eight, nine This is to get me going on this and I will have to do a LOT of text manipulation beyond this. So any tips in general are highly appreciated. Thank you On Wed, Jun 26, 2013 at 12:05 PM, Makarand Datar wrote: > Hi, > > I know practically nothing about python. I know how to install it and all > that kind of stuff. I want to use python for parsing a text file. The task > is to read in a text file, and write out another text file that is written > in some particular way using the data from the file that was read in. The > question is how do I go about this? What part of python documentation, or a > book I should read etc. I dont want to start reading a python book from the > first page. I just want to do this parsing task and I will learn about > whatever I need to as I encounter it. > > Thank you for the help. > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Interpret the contents of a line
Hi, I am working on a parser and my input file is a description about bunch of things written line by line. So for instance, consider the following two lines and what the corresponding variables in python should look like. example Line1: position = 1, 1, rotation = 90, 0, 0, mass = 120; Here I want the variables to be position = [1,1,0], rotation = [90,0,0], mass = [120] example Line2: position = 1, 1, 2, mass = 120, rotation = 90, 0; Here I want the variables to be position = [1,1,2], rotation = [90,0,0], mass = [120] example Line3: mass = 120, rotation = 90, 0; Here I want the variables to be position = [0,0,0], rotation = [90,0,0], mass = [120] I know the maximum number of arguments possible for each variable. For example, in the first line above, only two numbers for position ares specified; that means that the third entry in position list is zero. So I need to handle these cases while reading in the file as well. Additionally, the text might not always be in the same order; like shown in the second line above. And finally, sometimes numbers for one variable might not exist at all; like shown in line 3. Here, the position is then read as position = [0,0,0]. How do I implement such stuff? Is there some smart way of doing this? All I have in mind is this: read a line as comma or a space delimited list of words variable and then some how use if else + len(list) to figure out whats going on. But that seems way too tedious and I feel that there might be an easier way to read such things. Any help is highly appreciated. Thank you ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
