On 06/28/2013 09:20 PM, Titiksha Joshi wrote:
Hi,
I am working on the following code but am getting the error: list index out of
range. I surfed through the group but somehow I am not able to fix my
error.Please guide.Structure is given below:
m is a list of 5 elements. I have to match elements of m from fields in file
ALL_BUSES_FINAL.cvs.
m=['631138', '601034', '2834', '2908', '64808']
It's not hard to see what's wrong in the following excerpt, but it is
hard to guess what you really wanted.
Did you want to find all lines which match any of the strings in m? Or
are you just satisfied to match each of the strings in m against *some*
line of the file? Or is it something else entirely?
You have a nested loop here (for loop inside a while loop), and you're
confusing the limit values for the outer one.
i=0
while i<len(m):
print(i)
my_file = open("ALL_BUSES_FINAL.csv", "r+")
for line in my_file:
if m[i] in line:
print (line)
a.append(line)
i+=1
You increment i here, but do not check if it's reached the end of the m.
So eventually it does, and crashes.
print(a)
my_file.close()
The output is as follows:
0
LAKEFLD 3227,631138
['LAKEFLD 3227,631138\n']
1
NOBLES 3013,601034
['LAKEFLD 3227,631138\n', 'NOBLES 3013,601034\n']
2
GR_ISLD I,2834
['LAKEFLD 3227,631138\n', 'NOBLES 3013,601034\n', 'GR_ISLD I,2834\n']
FTTHOMP 928,2908
['LAKEFLD 3227,631138\n', 'NOBLES 3013,601034\n', 'GR_ISLD I,2834\n',
'FTTHOMP 928,2908\n']
VICTRYH 15,64808
['LAKEFLD 3227,631138\n', 'NOBLES 3013,601034\n', 'GR_ISLD I,2834\n',
'FTTHOMP 928,2908\n', 'VICTRYH 15,64808\n']
Traceback (most recent call last):
File "C:\Users\TJ\dist_tracking.py", line 40, in <module>
if m[i] in line:
IndexError: list index out of range
I see the line,a being correct but print (i) does not show up after 2. and
index error comes up. I am too confused now. Please guide.
Thanks in advance.
Another big problem will arise as soon as you have a string in m which
is a strict substring of a value in the line. You'll get false matches.
So presumably you really want to use csv logic, and have explicit
fields that you're searching for, rather than using 'in' operator. And
at that point, maybe you just want to check field #2 of each line.
--
DaveA
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