CODEWITHSUNDEEP
python
schnimmy
schnimmy

Reputation: 53

python read from file write to other file

file1 = open('/path/to/file1.txt', "r")
file2 = open('/path/to/file2.txt', "wa")
counter = 1

for line in file1:
    new_string = str(counter) + '\t' + line
    file2.write(new_string)
    counter += 1

I am trying to add a number to the beginning of every line in a file and append this line by line to a new file. There are 1189 lines of text in the original file and despite a number of attempts I only get 1168 lines in the new file. What's going on?

I added a print statement ( print str(counter) + " " + line), all the lines from the original file get printed out with the expected number beside them. The counter variable is 1190 after the loop runs.

EDIT: inserting file2.close() after the loop worked, all 1189 lines are in the second file now, but why?

Upvotes: 1

Views: 141

Answers (2)

runcoderun
runcoderun

Reputation: 531

Your file1 and file2 point to the same file in the code sample you have given.

Upvotes: 1

lukeg
lukeg

Reputation: 4399

Do you close the file you're writing to, i.e. execute file2.close() after the loop?

Upvotes: 1

Related Questions