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Reading a file with without comments in python

i need to read a file in python. My Problem is, that the file has an alternating amount of columns and that there are comments at the end of each line. I want to get rid of the comments while I read the file and save the data in a array or something like that. I Have absolutely no idea how to do that. Can anyone of you help me?
This is how the file looks like:

2.0 # mass

-2.0 2.0 1999 # xMin xMax nPoint

1 5 # first and last eigenvalue to print

linear # interpolation type

2 # nr. of interpolation points and xy declarations

-2.0 0.0

2.0 0.0

#

string - "2.0 2.0 1999 # xMin xMax nPoint"

string[:string.index('#')]

4 Answers
4

l =
with open('data.txt', 'r') as f:
for line in f:
l.append(line.split('#')[0].split())
print(l)

# Output:
# [[2.0], [-2.0, 2.0, 1999], [1, 5], [linear], [2], [-2.0, 0.0], [2.0, 0.0]]


Is your data stored in csv? If yes, then this solution should work (I havent tested it though). If it isnt csv, then you can tweak it to match your source:

import csv
data=
with open('C:\data.csv', 'r') as csvfile:
csvreader = csv.reader(csvfile, delimiter = ',')
for row in csvreader:
datarow=
for col in row:
if not col.startswith('#'):
datarow.append(col)
data.append(datarow)


Your datarow(array) will contain the final data, minus the comments. Let me know if it works!

data.txt:

2.0 # mass

-2.0 2.0 1999 # xMin xMax nPoint

1 5 # first and last eigenvalue to print

linear # interpolation type

2 # nr. of interpolation points and xy declarations

-2.0 0.0

2.0 0.0


main.py:

#open file and write into "content"
with open('data.txt', 'r') as f:
content = f.readlines()

datalines=

for line in content:

# remove linebreaks
newline = line.replace('n','')

# find start of comments
location = newline.find('#')
# if line has no comment location = -1
if location >= 0:
# write into "newline" without comment, remove whitespaces at start and end with strip
newline = newline[0:location].strip()

# only append if line is not empty
if newline is not '':
datalines.append(newline)

# print
print(datalines)


print:

['2.0', '-2.0 2.0 1999', '1 5', 'linear', '2', '-2.0 0.0', '2.0 0.0']


If you want I wrote a python module IO that makes file read easy, allowing you to ignore comments, even in the middle of a line. I am developing it on my GitHub

IO

data.txt

data.txt

2.0 # mass

-2.0 2.0 1999 # xMin xMax nPoint

1 5 # first and last eigenvalue to print

linear # interpolation type

2 # nr. of interpolation points and xy declarations

-2.0 0.0

2.0 0.0


The python code consists of only 2 lines

In [1]: import IO
In [2]: data = IO.readfile("data.txt").tolist() # Returns a numpy object instead

Warning: not all lines have the same shape
Most frequent lenght : 2 (4 counts)
Check rows : 0 1


As you can see the module even gives you a warning if the lines do not have the same number of elements (since I wrote this to read tabulated data)

The output is

In [3]: data
Out[3]:
[[2.0],
[-2.0, 2.0, 1999.0],
[1.0, 5.0],
[2.0, 0.0],
[-2.0, 0.0],
[2.0, 0.0]]


Unfortunately this does not work for strings, so you may wish to select the interpolation type with a number (i.e. linear = 1, quadratic = 2, cubic = 3 etc.)

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