To run this:

• pip3 install -r requirements.txt

• python crypt --help
  

  Output:

  usage: crypt.py [-h] [-g] [-e] [-d] file
  
  Simple File Encryptor Script
  
  positional arguments:
  file                File to encrypt/decrypt
  
  optional arguments:
  -h, --help          show this help message and exit
  -g, --generate-key  Whether to generate a new key or use existing
  -e, --encrypt       Whether to encrypt the file, only -e or -d can be
                      specified.
  -d, --decrypt       Whether to decrypt the file, only -e or -d can be
                      specified.
  

• If you want to encrypt data.csv using a new generated key:

  python crypt.py data.csv --generate-key --encrypt
  

• To decrypt it (must be same key, using --generate-key flag with decrypt won't be able to get the original file):

  python crypt.py data.csv --decrypt
  

• To encrypt another file using the same key generated previously:

  python crypt.py another_file --encrypt