CODEWITHSUNDEEP
pythonrepeat
Jesse Dugger
Jesse Dugger

Reputation: 55

Repeating contents of a file into another file using Python

So I am new to Python and I am trying to create a script that reads 10 lines of data from one text file and then repeats that data 1000 times and writes it to another text file. Reading the file is not the problem, but this is what I have:

fr = open('TR.txt', 'r')
text = fr.read()
print(text)
fr.close()

Now I understand that this opens the file and prints the contents. I just need to take those entries and repeat them 1000 times and then write those to a file. This is what I have so far to write to a file (I know this probably doesn't make sense):

fw = open('TrentsRecords.txt', 'w')
fw.write(text.repeat(text, 1000000))
fw.close()

Upvotes: 1

Views: 1813

Answers (3)

Padraic Cunningham
Padraic Cunningham

Reputation: 180481

from itertools import repeat,islice

fw.write("".join(repeat(text, 10000)))

So:

with open('TR.txt') as fr, open('TrentsRecords.txt', 'w') as fw:
    text = list(islice(fr, None, 10)) # get first ten lines
    fw.writelines(repeat(line.strip()+"\n", 10000)) # write first ten lines 10000 times

with will automatically close your files.

Upvotes: 1

Jonathan Epstein
Jonathan Epstein

Reputation: 379

text = (text + '\n')*1000
fw.write(text)

Upvotes: 0

Malik Brahimi
Malik Brahimi

Reputation: 16711

Just multiply. If it is a string, it will concatenate. If it is a number, it will multiply.

fw.write(text * 1000000) # add newlines if you want

Look at the Python Documentation. This is taken straight from it.

Strings can be concatenated (glued together) with the + operator, and repeated with *:

>>> # 3 times 'un', followed by 'ium'
>>> 3 * 'un' + 'ium'
'unununium'

Upvotes: 1

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