attach.py

import os
import sys
import base64
from stat import S_ISREG
import itertools



if __name__ == "__main__":

    if len(sys.argv) < 3:
        print("Erro paramentos Incorretos")
        sys.exit(1)
    
    try:
        arquivo=sys.argv[1]    
    except IndexError as ie:
        print("Arquivo nao Encontrado")
        sys.exit(1)


    try:
        mode = os.lstat(arquivo).st_mode
        if not S_ISREG(mode):
            print("Nao e um Arquivo!")
            sys.exit(1)
    except FileNotFoundError as ex:
        print(ex)
        exit(1)



    try:
        linhas=int(sys.argv[2])
    except IndexError as ie:
        print("Linhas nao definidas!")
        sys.exit(1)


    
    try:
        saida=str(sys.argv[3])
    except IndexError as ie:
        print("Saida nao definidas!")
        sys.exit(1)



    with open(arquivo,"r") as f:

        out = open(saida,"wb")        
        for line in itertools.islice(f,linhas,None):
    
            if not line:
                break

            out.write(base64.b64decode(line))

        out.close()