Steve wrote:
> My program reads from a text file (A), modifies the data, and writes to
> another file (B). This works until I reach about 300 writes and no more
> lines are written to file (B).
>
> I had to create a Counter and increment it to 250 when it gets reset.
>
> Upon reset, I close the file (B) being written and reopen it for append.
>
> Then it accepts the entire list of lines of data.
>
>
>
> Bizarre?
Maybe a misdiagnosis. If you are reading the file contents while it is still
open some output may reside in a buffer that is invisible to the reading
file object.
> CycleCounter += 1
>
> if CycleCounter > 250:
>
> CycleCounter = 1
Try replacing the following two lines
> DateReadings.close()
> DateReadings=open("Date-ReadingsAndDoses.txt", "a")
with
DateReadings.flush()
If that has the same effect as the close()/open() dance remove the flush(),
too, and ensure that the file is closed before you check its contents. The
with statement is the established way to achieve that. Instead of
file = open(...)
do_stuff_with(file)
file.close() # not called if there is an exception
write
with open(...) as file:
do_stuff_with(file)
# at this point the file is guaranteed to be closed.
>
> DateReadings.write("{0:15} {1:>8} {2:>8} {3:>8} {4:<2}
> {5:>8} {6:>8} {7:>10}".format
>
> (ThisTimeDate, ThisReading, ThisDose1,
> ThisSensor, ThisTrend,
>
> ThisTS, ThisPercent, SensorNumberDay2) +
> "\n")
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