Execute commands from file

[Steve Holden]

Martin Blume wrote:
> "tmp123" schrieb > 
>> We have very big files with python commands 
>> (more or less, 500000 commands each file).
>>
>> It is possible to execute them command by command, 
> 
> inp = open(cmd_file)
> for line in inp:
>     exec line
> 
> might help. You don't get quite the same feeling as
> "like if the commands was typed one after the other 
> in a interactive session", but perhaps this helps.
> 
> Warning: the code above is without any error checks.
> You might also run into security problems, the example
> above assumes you trust your input.
> 
> HTH. YMMV.
> Martin
> 
The problem with this approach is that each line executes without any 
connection to the environment created by previous lies.

Try it on a file that reads something like

xxx = 42
print xxx

and you will see NameError raised because the assignment hasn't affected 
the environment for the print statement.

regards
  Steve
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