How to reverse a txt file in python 3.8?

July 5, 2022

data = data2 = data3 = ""

with open('pushkin.txt', encoding='utf-8', mode='r') as fp:
    data = fp.read()

with open('romeo.txt', encoding='utf-8', mode='r') as fp:
    data2 = fp.read()
with open('byron.txt', encoding='utf-8', mode='r') as fp:
    data3 = fp.read()


data += "\n"
data += data2 + data3

with open('poems.txt', 'w', encoding='utf-8') as fp:
    fp.write(data)

With this code, I have transferred three text files into one.
Now I need to turn over text in that file, like this:

ABC       CDA
BCA  -->  BCA
CDA       ABC

but I don’t know how. I thought using reverse() or reversed(), but that makes it just from
abc to cba

>Solution :

You can use reverse() to reverse the order of elements in a list after saving all the contents as list type to data variable, not the specific string, as follows:

data = []

with open('1.txt', encoding='utf-8', mode='r') as fp: # ABC
    data += fp.readlines()
    # data -> ['ABC\n']

with open('2.txt', encoding='utf-8', mode='r') as fp: # BCA
    data += fp.readlines()
    # data -> ['ABC\n', 'BCA\n']

with open('3.txt', encoding='utf-8', mode='r') as fp: # CDA
    data += fp.readlines()
    # data -> ['ABC\n', 'BCA\n', 'CDA\n']

data.reverse() # data becomes ['CDA\n', 'BCA\n', 'ABC\n']

with open('result.txt', 'w', encoding='utf-8') as fp:
    fp.write("".join(data))