CODEWITHSUNDEEP
pythontext-files
irfanbukhari
irfanbukhari

Reputation: 205

How do I save outputs of a variable in a loop to a text file in python in columns?

I am generating random edges from a graph and printing them, but every time I try to save it to a text file, I end up with errors like TypeError: expected a character buffer object. The code is below:

import re
import md5
import pickle
import networkx as nx
import itertools
from random import choice

ff=open("testfile.txt","r+")
G=nx.read_gpickle("authorgraph_new.gpickle")
for nodes in G:
    random_edge=choice(G.edges())
    ff=open("testfile.txt","a")
    ff.write(random_edge)

I need to save the outputs of random_edge in a text file preferably in columns, as the value of random_edge is in the form (abcdef, pqrstu). I want to put the two in separate column in the same line and the next value in the same columns. I know I can use the "\n" to get the outputs to newline but when I used 

ff.write(random_edge + "\n")

I get an error TypeError: can only concatenate tuple (not "str") to tuple.

Upvotes: 1

Views: 836

Answers (2)

abought
abought

Reputation: 2680

Joel's comment is correct: you're concatenating your result (a tuple) with the newline character, a string. Python doesn't like mixing datatypes that way. If you're writing more complex structured data, then in the future you may want to look into python's csv module as well.

Upvotes: 0

diffracteD
diffracteD

Reputation: 758

In that case you may have a try to do it in 2 lines like:

for nodes in G:
    ff.write(random_egde)
    ff.write('\n')

hope this would work for your case.
here first line writes your data while the second line adds a new line to the data.

Upvotes: 2

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