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import re

emails = ['pytorchee@ggamail.com',
          'tensorfloww@hahamail.co.kr',
          'kerakera@papamail.net']

without_at = [re.sub(r'@', '', mail) for mail in emails]
print(without_at)
['pytorcheeggamail.com', 'tensorflowwhahamail.co.kr', 'kerakerapapamail.net']
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