How to concatenation string value with every line in text file Python

Question

I have a large text file it contains 700k lines. I want to concatenation or append small string "/products/all.atom" with every single line.

I tried this code

enter code here
import os
import sys
import fileinput

print ("Text to search for:")
textToSearch = input( "> " ) 

print ("Text to replace it with:")
textToReplace = input( "> " )

print ("File to perform Search-Replace on:")
fileToSearch  = input( "> " )
#fileToSearch = 'D:\dummy1.txt'

tempFile = open( fileToSearch, 'r+' )

for line in fileinput.input( fileToSearch ):
if textToSearch in line :
    print('Match Found')
else:
    print('Match Not Found!!')
tempFile.write( line.replace( textToSearch, textToReplace ) )
tempFile.close()


input( '\n\n Press Enter to exit...' )

But code is not working perfect, what i am doing here is replacing ".com" with ".com/products/all.atom" but when i run this command loop is going infinite and it writes file with 10gb of size.

Here is example what i want:

store1.com > store1.com/products/all.atom
store2.com > store2.com/products/all.atom
store3.com > store3.com/products/all.atom

click here to check text file

please help me.

Answer 1

Try list comprehension and string concatenation:

with open('file.txt','r') as f:
    print([line.strip() + "/products/all.atom" for line in f])

outout:

['store1.com/products/all.atom', 'store2.com/products/all.atom', 'store3.com/products/all.atom', 'store4.com/products/all.atom']

Updated solution:

Here is how you will write in new file:

with open('names','r') as f:
    data=[line.strip() + "/products/all.atom" for line in f]
    with open('new_file','w+') as write_f:
        for line_1 in data:
            write_f.write(line_1 + '\n')