I'm not particularly experienced with python, so may be doing something silly below. I have the following program:
import os import re import linecache LINENUMBER = 2 angles_file = open("d:/UserData/Robin Wilson/AlteredData/ncaveo/16-June/scan1_high/000/angles.txt") lines = angles_file.readlines() for line in lines: splitted_line = line.split(";") DN = float(linecache.getline(splitted_line, LINENUMBER)) Zenith = splitted_line output_file = open("d:/UserData/Robin Wilson/AlteredData/ncaveo/16-June/scan1_high/000/DNandZenith.txt", "a") output_file.write("0\t" + str(DN) + "\t" + Zenith + "\n") #print >> output_file, str(DN) + "\t" + Zenith #print DN, Zenith output_file.close()
When I look at the output to the file I get the following:
0 105.5 0.0 0 104.125 18.0 0 104.0 36.0 0 104.625 54.0 0 104.25 72.0 0 104.0 90.0 0 104.75 108.0 0 104.125 126.0 0 104.875 144.0 0 104.375 162.0 0 104.125 180.0
Which is the right numbers, it just has blank lines between each line. I've tried and tried to remove them, but I can't seem to. What am I doing wrong?
For a GENERAL solution, remove the trailing newline from your INPUT:
splitted_line = line.rstrip("\n").split(";")
Removing the extraneous newline from your output "works" in this case but it's a kludge.
ALSO: (1) it's not a good idea to open your output file in the middle of a loop; do it once, otherwise you are just wasting resources. With a long enough loop, you will run out of file handles and crash (2) It's not a good idea to hard-wire file names like that, especially hidden in the middle of your script; try to make your scripts reusable.
output_file.write("0\t" + str(DN) + "\t" + Zenith + "\n")
output_file.write("0\t" + str(DN) + "\t" + Zenith)
Zenith string already contains the trailing
\n from the original file when you read it in.
Alternative solution (handy if you are processing lines from file) is to strip the whitespace:
Zenith = Zenith.strip();
EDIT: See comments for details, but there's definitely a better way.
[:-1] isn't the best choice, no matter how cool it looks. Use
The problem is that, unlike
file.readlines() does not remove the
\n from the end of each line of input. My default pattern for parsing lines of text goes like this:
with open(filename) as f: for line in f.readlines(): parse_line(line[:-1]) # funny face trims the '\n'
If you want to make sure there's no whitespace on any of your tokens (not just the first and last), try this:
splitted_line = map (str.strip, line.split (';'))