Assume you\'re working on a contract where a company is building a mailing list

Question

Assume you're working on a contract where a company is building a mailing list (or, rather, an e-mailing list) by analyzing e-mail messages. Your task is to write a Python program that reads a file (stored in the current working directory) called mail.dat and outputs to a file called addresses.dat, one per line, every e-mail address contained inside the file. For this assignment, if a whitespace delimited string of characters has an embedded commercial at sign (@) inside it (that is, interior to the string), we shall consider it an e-mail address. However, any trailing commas must be trimmed from addresses. Thus the string "..c@mtsu.edu," must appear in the output file as "..c@mtsu.edu" with the trailing comma removed. Only commas at the end of a string are considered trailing; do not remove non-trailing commas. Do not worry about any other punctuation characters; the only editing your program must do is to remove trailing commas.

What I have so far is the following:

def main():

mail = open('mail.dat','r')

line = mail.realine()

while line != "":

tokens = line.split()

for word in tokens:

print(tokens)

line = mail.readline()

when I run the program I get each word by itself but in a list.

Explanation / Answer

# pastebin link for the code : https://pastebin.com/94zFKcFe

def main():
with open('addresses.dat', 'w') as out:
with open('mail.dat','r') as mail:
for line in mail:
tokens = line.split()
for word in tokens:
if '@' in word:
word = word.rstrip(",")
out.write(word)
out.write(" ")

if __name__ == "__main__":
main()

I used following as mail.dat

mail1@mail1 junk mail1@withtrailingcomma, junk junk junk mail,insidecomma@comma, mail,inside,@nooutside junk
mail1@mail2 junk mail1@withtrailingcomma, junk junk junk mail,insidecomma@comma, mail,inside,@nooutside junk
mail1@mail3 junk mail1@withtrailingcomma, junk junk junk mail,insidecomma@comma, mail,inside,@nooutside junk
mail1@mail4 junk mail1@withtrailingcomma, junk junk junk mail,insidecomma@comma, mail,inside,@nooutside junk

Here is my output
mail1@mail1   
mail1@withtrailingcomma   
mail,insidecomma@comma   
mail,inside,@nooutside   
mail1@mail2   
mail1@withtrailingcomma   
mail,insidecomma@comma   
mail,inside,@nooutside   
mail1@mail3
mail1@withtrailingcomma   
mail,insidecomma@comma   
mail,inside,@nooutside
mail1@mail4   
mail1@withtrailingcomma   
mail,insidecomma@comma
mail,inside,@nooutside

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