Olli Virta wrote:
Hi!
I got this simple but effective piece of code. It picks certain wanted
pieces of data from a textfile based on database records and puts all
of them them in a new textfile in certain order. I was wondering,
could it be possible to make it otherwise in case that there's much
more rows in that textfile and/or there's much more bits of data to
collect?
Otherwise is always possible! What is the problem? Why do you want it
"otherwise"?
data = open('data.txt','r')
f1 = data.readlines()
data.close()
There is no need to do the above! You don't need a line count to control
the loop.
f2 = open('data.txt','r')
Drop next lline:
i=0
f3 = []
Change next two lines:
while i < len(f1):
a=f2.readline()
To:
while True:
a=f2.readline()
if not a: break
b=f2.readline()
c=f2.readline()
data2 = (
a[1:38].strip()+';'+
a[54:88].strip()+';'+
b[77:96].strip()+';'+
b[1:16].strip()+';'+
c[23:33].strip()+';'+
c[123:133].strip()+';'
)
wanted = (data2)
If you are concerned about enough memory, write data2 to the file
instead of collecting in a list.
f3.append(wanted + "\n")
Drop next line:
i += 3
f4 = open('wanted.txt', 'w')
f4.write(''.join(f3))
f2.close()
f4.close()
--
Bob Gailer
Chapel Hill NC
919-636-4239
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