passing variable into index function - Python

Question

Been working at this for quite a while, and I haven't found any examples on this site or any others that seem relevant. I have a list, and what I'm trying to do is pretty simple I think. I just need to search that list to find the key word "Buffer Log". Once I find that keyword, I need to print every line from that line, until the end of the list. Any direction at all would be very much appreciated. It seems like I'm pretty close.

logfile = open('logs.txt', 'r')
readlog = logfile.readlines()
logfile.close()

lines = []
for line in readlog:
    lines.append(line)


for x in lines:
    if "Log Buffer" in x:
       z =lines.index(x)
       print(lines[z:]

What is the current output?

Albert Alonso
– Albert Alonso

2019-03-14 21:35:38 +00:00
Commented Mar 14, 2019 at 21:35 — Albert Alonso
– Albert Alonso, Commented Mar 14, 2019 at 21:35

Reedinationer · Accepted Answer · 2019-03-14 21:35:59Z

6

Firstly, the code:

lines = []
for line in readlog:
    lines.append(line)

Is unnecessary because readlog is already a list. You can try something along the lines of this:

found = False
for line in readlog: # because this is already a list
    if "Log Buffer" in line:
        found = True # set our logic to start printing
    if found:
        print(line)

answered Mar 14, 2019 at 21:35

Reedinationer

5,7841 gold badge14 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

fountainhead · Accepted Answer · 2019-03-14 22:34:29Z

1

You don't need the for loop in which yoú're creating one more list called lines.

You can use enumerate() to keep track of which line number you are at, while searching for the line that contains 'Log Buffer'

When you find the line that contains 'Log Buffer', just remember that line number, exit the loop, and then print all lines from readlog starting from that line number.

logfile = open('logs.txt', 'r')
readlog = logfile.readlines()
logfile.close()

for i,x in enumerate(readlog):
    if 'Log Buffer' in x:
        z = i # Remember the value of i for which the line had 'Log Buffer'
        break # Exit the loop.

print (*readlog[z:])  # Move your print statement outside the loop.

edited Mar 14, 2019 at 22:34

answered Mar 14, 2019 at 22:08

fountainhead

3,7421 gold badge11 silver badges18 bronze badges

Collectives™ on Stack Overflow

passing variable into index function - Python

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related