En Tue, 13 Nov 2007 06:23:02 -0300, Beema shafreen
<[EMAIL PROTECTED]> escribió:
> for k in range(0,len(res_value),3):
> check = res_value[k:k+4]
> if check[0] < check[4]:
> print check
> error: File "app.py", line 16, in <module>
> if check[0] < check[4]:
> IndexError: list index out of range
> i get an error like this how do i sort the error out to get result
Look at the exception: IndexError: list index out of range. That's pretty
explicit: "some index" used as a subscript on "some list" is out of the
allowed range. Most of the time, that means that the index is greater than
or equal to the list length. Now look at the source line: if check[0] <
check[4]. The possible out-of-range indexes are 0 and 4. 0 may be an
invalid index when the list is empty; but the 4 is much more suspicious.
We have to determine the length of the "check" list; that's easy looking
one line above; res_value[k:k+4] has length 4. Valid indexes include 0, 1,
2, and 3; 4 is an invalid index.
Now you should have enough info to fix your code. But, why use a flat
list? Your data has certain structure, and you already read it line by
line and use different variable names for each field. If you maintain that
structure instead of flattening it into a list with anonymous elements,
your code will be easier to write (and read, and understand).
Your file looks like a CSV file, and you could use the cvs module to read
it. Let's read the file the same way you did, but using an object per row:
class ProbeData: # please choose a better name!
"Holds current_span, probe, and length"
def __init__(self, current_span, probe, length):
self.current_span = current_span
self.probe = probe
self.length = length
def __str__(self):
return "%d %s %d" % (self.current_span, self.probe, self.length)
__repr__ = __str__
dataset = []
fh = open('test','r')
for line in fh: # note that I've removed readlines()
data = line.strip().split('\t')
current_span = int(data[3].strip()) # assuming it's an integer
probe = data[2].strip()
length = int(data[4].strip()) # assuming it's an integer too
probe_data = ProbeData(current_span, probe, length)
dataset.append(probe_data)
fh.close()
for k in range(len(dataset)-1):
this_probe = dataset[k]
next_probe = dataset[k+1]
if this_probe.current_span < next_probe.current_span:
# Please check the condition above, it's just an example
print this_probe
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
