I have a file (test.txt) like this:
[06/Oct/2017:20:18:47 +0200] [pool-2-thread-7] http://10.12.214.20
[06/Oct/2017:20:19:38 +0200] [pool-2-thread-4] http://10.12.214.18
[06/Oct/2017:20:19:38 +0200] [pool-2-thread-4] http://10.12.214.18
[06/Oct/2017:20:19:49 +0200] [pool-2-thread-8] http://10.12.214.18
[06/Oct/2017:20:19:59 +0200] [pool-2-thread-7] ends.
[06/Oct/2017:20:20:47 +0200] [pool-2-thread-7] http://10.12.214.20
[06/Oct/2017:20:21:24 +0200] [pool-2-thread-4] ends.
[06/Oct/2017:20:21:34 +0200] [pool-2-thread-8] ends.
As a python-beginner i wanted to get the linenumber of a specific line, so i searched for a solution and found this post: Finding the index of an item given a list containing it in Python. I am using the answer of @tanzil, because later on it is possible, that i do look for elements not in the list.
This is what i do:
Save the lines of the original file in a list:
with open(test.txt) as f:
content = [line.rstrip('\n') for line in f]
print len(content)
index = [x for x in range(len(content))]
Iterate through the original file:
with open(test.txt, "r") as file:
for line in file:
print find_element_in_list(index, line.rstrip('\n'))
Find the index of each line of the original file:
def find_element_in_list(index_list, list_element):
try:
index_element = index_list.index(list_element)
return index_element
except ValueError:
return None
As a result, there is no match at all. I only get "None" as output.
I read this post 'is' operator behaves differently when comparing strings with spaces and hoped to get an answer to my question, but couldn't adapt the answers to my problem.
I would apreciate any hints or ideas!
(This is not a dublicate of Get Line Number of certain phrase in file Python because i need to access the indices of different lines multiple times. I am not iterating through the file everytime i need a specific one.)
I think you are looking in the wrong list. Instead of looking in the index, try looking in content
with open('test.txt', "r") as file:
for line in file:
print find_element_in_list(content, line.rstrip('\n'))