os.execv(program, commandlinesequence)
The basic “v” exec form is passed an executable program’s name, along with a listor tuple of command-line argument strings used to run the executable (that is, thewords you would normally type in a shell to start a program).
os.execl(program, cmdarg1, cmdarg2,... cmdargN)
The basic “l” exec form is passed an executable’s name, followed by one or morecommand-line arguments passed as individual function arguments. This is thesame as os.execv(program, (cmdarg1, cmdarg2,...)).
os.execlp
os.execvp
Adding the letter p to the execv and execl names means that Python will locate theexecutable’s directory using your system search-path setting (i.e.,PATH).
os.execle
os.execve
Adding a letter e to theexecvandexeclnames means an extra, last argument is adictionary containing shell environment variables to send to the program.
os.execvpe
os.execlpe
Adding the letters p and e to the basicexecnames means to use the search pathandto accept a shell environment settings dictionary.