Convert a space delimited file to comma separated values file in python

Question

I am very new to Python. I know that this has already been asked, and I apologise, but the difference in this new situation is that spaces between strings are not equal. I

Answer 1

replace your first bit with this. it's not super pretty but it will give you a csv format.

with open('coord') as infile, open('coordv', 'w') as outfile:
    for line in infile:
        outfile.write(" ".join(line.split()).replace(' ', ','))
        outfile.write(",") # trailing comma shouldn't matter

if you want the outfile to have everything on different lines you could add outfile.write("\n") at the end of the for loop, but i dont think your code that follows this will work with it like that.

Answer 2

You can use python pandas, I have written your data to data.csv:

import pandas as pd
>>> df = pd.read_csv('data.csv',sep='\s+',header=None)
>>> df
     0  1  2         3         4  5
0    1  C  6  0.000000  1.342650  0
1    2  C  6  0.000000 -1.342650  0
2    3  C  6  2.325539  2.685301  0
3    4  C  6  2.325539 -2.685301  0
4    5  C  6  4.651077  1.342650  0
5    6  C  6  4.651077 -1.342650  0
...

The great thing about this is to access the underlying numpy array you can use df.values:

>>> type(df.values)
<type 'numpy.ndarray'>

To save the data frame with comma delimiters:

>>> df.to_csv('data_out.csv',header=None)

Pandas is a great library for managing large amounts of data, as a bonus it works well with numpy. There is also a very good chance that this will be much faster then using the csv module.

Answer 3

>>> a = 'cah  1  C       6.00    0.000000000    1.342650315    0.000000000'
=>  a = 'cah  1  C       6.00    0.000000000    1.342650315    0.000000000'

>>> a.split()
=>  ['cah', '1', 'C', '6.00', '0.000000000', '1.342650315', '0.000000000']

>>> ','.join(a.split())
=>  'cah,1,C,6.00,0.000000000,1.342650315,0.000000000'

>>> ['"' + x + '"' for x in a.split()]
=>  ['"cah"', '"1"', '"C"', '"6.00"', '"0.000000000"', '"1.342650315"', '"0.000000000"']

>>> ','.join(['"' + x + '"' for x in a.split()]
=>  '"cah","1","C","6.00","0.000000000","1.342650315","0.000000000"'

Answer 4

You can use csv:

import csv

with open(ur_infile) as fin, open(ur_outfile, 'w') as fout:
    o=csv.writer(fout)
    for line in fin:
        o.writerow(line.split())

Answer 5

The csv module is good, or here's a way to do it without:

#!/usr/local/cpython-3.3/bin/python

with open('input-file.csv', 'r') as infile, open('output.csv', 'w') as outfile:
    for line in infile:
        fields = line.split()
        outfile.write('{}\n'.format(','.join(fields)))

Answer 6

for converting "space" to ","

only fill the filename to what you want

with open('filename') as infile, open('output', 'w') as outfile:
    outfile.write(infile.read().replace(" ", ","))

for converting "," to "Space"

with open('filename') as infile, open('output', 'w') as outfile: outfile.write(infile.read().replace(",", " "))