How to speed up process in Python

Question

Hello. I have this code here that basically puts text documents into 1 text document.

filenames = [‘10k mails_1’, ‘10k mails_2’, ...]
with open(‘C:\Users\Caesar Ronin \Desktop\All Mails.txt’, ‘w’) as outfile:
for fname in filenames:
with open(fname) as infile:
for line in infile:
outfile.write(line)

It works perfectly, however, I want to put in multiple .txt documents at where the ... is at, without having to write them 1 by 1. Could there be a code that for example lets me add +1 to the end of the .txt at filenames since they’re numbered with the same filename?
So maybe a loop that adds +1 so it becomes 10k mails_3, 10k mails_4 etc. up until for example < 100 without me having to write the full name, or even the numbers.

Answer 1

You can combine Python3 F-String and list comprehension to generate list of file names (based on Abhay's example)

max_number = 100 # change as necessary
filenames = [ f"10k_mail_{n}.txt" for n in range( 1, max_number + 1 ) ]
print( file_names )

Answer 2

Sidar Sahin
filenames = ["10k mails_1","10k mails_2",*('10k mails_'+str(i) for i in range(3,100))]

Answer 3

I get at the line of

for fname in filenames:

FileNotFoundError: [Errno 2] No such file or directory: ‘10k mails_2’

So it is referring to the filenames that have been created using *list ...