Help me with python read file and save file

[wereak]

ID, email, random letter, Password, random letter, Title, random letter, Email Account Register with.

Line 7 has a value "null" so if the null value is found skip the line and continue.

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Filename input.txt

"ID":"Email","random letter":"Password","random letter":"Title","random letter":"Email Account Register with"

"1":"[email protected]","p":"password1","r":"PYTHON DEMO OUTPUT","d":"yahoo.com"
"2":"[email protected]","p":"password2","r":"PYTHON DEMO OUTPUT","d":"mail.bg"
"3":"[email protected]","p":"password3","r":"PYTHON DEMO OUTPUT,"d":"ya.ru"
"4":"[email protected]","p":"password4","r":"PYTHON DEMO OUTPUT","d":"yandex.ua"
"5":"[email protected]","p":"password5","r":"PYTHON DEMO OUTPUT","d":"yandex.by"
"6":"[email protected]","p":"password6","r":"PYTHON DEMO OUTPUT","d":"yahoo.com"
"7":"Demo_V;7829837","r":"PYTHON DEMO OUTPUT","d":null
"8":"[email protected]","p":"password8","r":"PYTHON DEMO OUTPUT","d":"gmail.com"
"9":"demo9_email@Tut.by","p":"password9","r":"PYTHON DEMO OUTPUT","d":"tut.by"
"10":"[email protected]","p":"password10","r":"PYTHON DEMO OUTPUT,"d":"t-online.de"

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Output and safe in other file output.txt
Email : Password : Email Account Register with



[email protected]:password1:yahoo.com
[email protected]:password2:ymail.bg
[email protected]:password3:ya.ru
[email protected]:password4:yandex.ua
[email protected]:password5:yandex.by
[email protected]:password6:yahoo.com
[email protected]:password8:gmail.com
demo9_email@Tut.by:password9:tut.by
[email protected]:password10:t-online.de

use the function findall to match the email
re.findall(r'([a-z0-9]+(\.[a-z0-9]+)*@[a-z]+(\.[a-z]+)+)