Python write to file in list format

Question

I am trying to write a program that will write a list of info in a text file. Here's an example of what I have so far

f.open('blah.txt','w')
x = input('put something here')
y = input('put something here')
z = input('put something here')
info = [x,y,z]
a = info[0]
b = info[1]
c = info[2]
f.write(a)
f.write(b)
f.write(c)
f.close()

However i need it to write it in a list-like format so that if I input

x = 1 y = 2 z = 3

then the file will read

1,2,3

and so that the next time I input info it will write it in a newline like

1,2,3
4,5,6

How can I fix this?

Lev Levitsky · Accepted Answer · 2013-06-21 18:50:36Z

2

Format a string and write it:

s = ','.join(info)
f.write(s + '\n')

answered Jun 21, 2013 at 18:50

Lev Levitsky

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Comments

Nik · Accepted Answer · 2013-06-21 18:50:52Z

1

Try this:

f.open('blah.txt','a') # append mode, if you want to re-write to the same file
x = input('put something here')
y = input('put something here')
z = input('put something here')
f.write('%d,%d,%d\n' %(x,y,z))
f.close()

answered Jun 21, 2013 at 18:50

Nik

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Comments

hdante · Accepted Answer · 2013-06-21 18:52:08Z

1

Use a complete, ready to use, serialization format. For example:

import json
x = ['a', 'b', 'c']
with open('/tmp/1', 'w') as f:
    json.dump(x, f)

File contents:

["a", "b", "c"]

answered Jun 21, 2013 at 18:52

hdante

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