Using pycham Compiler
python project:  untitled2
type pure  
cofiguration:
script path -  C:\...\Desktop\PSCgroup\4-pyCham\2-samples\prog_email\Scripts\python.exe 
python interpretor - C:/.../Desktop/PSCgroup/4-pyCham/2-samples/untitled2/file1_progemail.py


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Source code, python file: file1_progemail.py
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# Python program to mail merger
# Names are in the file names.txt
# Body of the mail is in body.txt
# open names.txt for reading
with open("C:\\_NF/names.txt",'r',encoding = 'utf-8') as names_file:
   # open body.txt for reading
   with open("C:\\_NF/body.txt",'r',encoding = 'utf-8') as body_file:
   
       # read entire content of the body
       body = body_file.read()
       # iterate over names
       for name in names_file:
           mail = "Hello "+name+body
           # write the mails to individual files
           with open(name.strip()+".txt",'w',encoding = 'utf-8') as mail_file:
               mail_file.write(mail)


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output, after debug and run the Resultat
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Process finished with exit code 0    (0 err0r)