CODEWITHSUNDEEP
pythonstdinraw-input
Gordon Amable
Gordon Amable

Reputation: 193

Python - program stops to read standard input

I'm writting a python script which receive several parameters on his standard input. I use the raw_input() function which works for the firsts parameters but totally freeze when I call it inside a while loop.

Here is my code:

def launch_trade(logger):
    Kerviel = Trader()
    param = raw_input() #Works fine
    Kerviel.Capital = float(param)
    param = raw_input() #Works fine
    Kerviel.NbDays = int(param)
    param = raw_input() #Works Fine
    while (param != '--end--'):
        Kerviel.action(float(param), logger)
        Kerviel.Cours.append(param)
        param = raw_input() #Here it infinite wait

Actually this program works when I send all parameters myself in my console. But it is supposed to be called by a php script which sends it parameters on his stdin.

Why does this last raw_input() doesn't work when parameters are sent by a php script ?

Thanks for your answers and sorry for bad english.

Upvotes: 0

Views: 145

Answers (1)

Terry Jan Reedy
Terry Jan Reedy

Reputation: 19144

Each input or raw_input call waits for a line ending with '\n'. A live user hits keys ending with the Enter key. A program has to send strings to stdout, connected to stdin, ending with '\n'. So the problem must be that the php program is not sending enough, or that not eveything it sends gets to your python program. If the latter, it could be that the php program needs to 'flush' stdout to push the last string to python. When a file is closed, flush is automatic, but stdout would not ordinarily be closed.

Upvotes: 1

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