How to add from text file line by line to this code with for loop?

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This code shows a directory's files' sizes and names. I want to add {description} from a text file (descriptiontext).

The original code is the following:

Python

import os
import glob

textfilename = 'textfilename'

with open(textfilename, 'a') as textfile:  # Open the text file for appending
    for filename in glob.iglob('*.pdf'):  # For every file in the current directory matching '*.pdf'
        stat = os.stat(filename)  # os.stat gets various file statistics
        filesize = stat.st_size
        textfile.write(f'File {filename} has size {filesize} bytes\n')  # \n means newline

The task is the following:

Append the last line with {description} what is derived from another text file named descriptiontext.
So every line of the descriptiontext has taken place in the last line at the {description} place with for loop.

I do not know how to conjugate two for loops.

What I have tried:

I have tried to nest a second for loop inside the first but it only adds the last element of the descriptiontext, the last line.

The nested loop was:

Python

with open(descriptiontext, 'r') as textfile2:
            for line in textfile2:
                description = line

Posted 21-May-20 5:53am

folza

Updated 21-May-20 6:03am

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Richard MacCutchan · Answer 1 · 2020-05-21T06:04:00

You can use the readline method to read a file one line at a time: see 7. Input and Output — Python 3.7.7 documentation[^]. So your code should be something like:

Python

descriptiontext = open("descriptiontext", 'r')
with open(textfilename, 'a') as textfile:  # Open the text file for appending
    for filename in glob.iglob('*.pdf'):  # For every file in the current directory matching '*.pdf'
        stat = os.stat(filename)  # os.stat gets various file statistics
        filesize = stat.st_size
        description = descriptiontext.readline()
        textfile.write(f'File {filename} has size {filesize} bytes : {description}\n')  # \n means newline