CODEWITHSUNDEEP
pythonfile-io
simplycoding
simplycoding

Reputation: 2977

How do I append to a file without adding '\n'?

I'm reading and appending to a text file that is being opened and read every time my Python program runs. It's basically a log of strings. The problem is that when I initially write to the blank file, I have to include action.write('\n') in order for the next string to be printed on the next line.

But then, when I read through the file the next time my Python program runs, it reads the "\n" and it gets concatenated to the previous element, which is added to a list.

Here's what is basically happening:

pc = ["121", "343", "565", "787"]

with open(r"C:\tt.txt", "r+") as act:
   curr=[]

   for row in act:
      if row == '\n':
         pass
      else:
         curr.append(row)

   for i in pc:
      act.write(i)
      act.write("\n")

print curr

>> curr = ['121\n', '343\n', '565\n', '787\n', '121\n', '343\n', '565\n', '787\n', '121\n', '343\n', '565\n', '787\n', '121\n', '343\n', '565\n', '787\n', '121\n', '343\n', '565\n', '787\n']

I'm really stumped as to how to get around this.

Upvotes: 0

Views: 3690

Answers (2)

Maksym Polshcha
Maksym Polshcha

Reputation: 18358

Just remove the last character from each row

for row in act:
row = row[:-1]
if row:
    curr.append(row)

Upvotes: 1

icktoofay
icktoofay

Reputation: 129011

Strip the lines:

for row in act:
    row = row.strip()
    if row:
        curr.append(row)

Upvotes: 6

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