CODEWITHSUNDEEP
python-3.x
Anton
Anton

Reputation: 1

Why index works so?

I have md5sum.txt file and a python program. Then I want to parse some strings from that file. I don't undestand why my program raises an exception as there should be two elements in the list: 

import hashlib

checksum_raw = open('F:/md5sum.txt', 'r').read()
cs_list_raw = checksum_raw.split("\n")
cs_list = []
for i in cs_list_raw:
    cs_list.append({
            'sum' : i.split('  ')[0],
            'path' : i.split('  ')[1]
            })
print (cs_list[0])

D:\newfolder\py_projects>py test.py
Traceback (most recent call last):
  File "test.py", line 9, in <module>
    'path' : i.split('  ')[1]
IndexError: list index out of range

But this one works well:

import hashlib

checksum_raw = open('F:/md5sum.txt', 'r').read()
cs_list_raw = checksum_raw.split("\n")
cs_list = []
for i in cs_list_raw:
    cs_list.append({
            'sum' : i.split('  ')[0],
            'path' : i.split('  ')[-1]
            })
print (cs_list[0])

D:\newfolder\py_projects>py test.py
{'sum': 'cde56251d6cae5214227d887dee3bab7', 'path': './pics/red-upperleft.png'}

Here are some strings from txt file:

cde56251d6cae5214227d887dee3bab7  ./pics/red-upperleft.png
0730e775a72519aaa450a3774fca5f55  ./pics/red-lowerleft.png
cd8aa5e7fa11b1362ef1869ac6b1aa56  ./pics/blue-lowerleft.png
92091902d3ca753bb858d4682b3fc26b  ./pics/logo-50.jpg
461cbc7ff94fdea8008cab34b611abb8  ./pics/blue-upperright.png
9e18ae797773b2677b1b7b86e2aff28d  ./pics/blue-lowerright.png
...

Upvotes: 0

Views: 45

Answers (1)

JavaiMaster
JavaiMaster

Reputation: 43

Python indexing works in such a way that -1 maps to the last element in the list. In your case, it looks like there is only one element in the list and hence both the index 0 and -1 map to the same element. You should double-check if all the lines follow the format you specified.

Upvotes: 1

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