On 27Feb2015 23:16, alan.ga...@btinternet.com <alan.ga...@btinternet.com> wrote:
On 27/02/15 20:00, Thomas Toker wrote:
I need to find the device address, usb port, and number of times the error
occurs
OK, Assume we don;t know anything about USB
Explain how that relates tom your sample data below.
Which columns do you want to extract/process?
Your data is not consistent in structure so using csv is
probably more trouble than its worth.
The OP wanted to write the results of his scan as CSV. The input isn't CSV; it
looks like Linux kernal demsg output with time-since-boot timestamp prefixes.
Look at using split() based on both spaces and colons.
I'd be:
- using split on space as suggested
- discarding/skipping (possibly noting) the timestamp column
- grabbing column 2 and checking for "hub" or "usb", ignoring other lines
- grabbing column 3 as the device designator; looks like 1+2 is a useful
device key
- keeping some state for the counting, and resetting the counter when you see
a new device
- for extra points, later, keeping multiple state in case thiese processes
ever overlap
I would suggest using "in" to check for strings and because they are very fixed
in kernel messages, checking for long strings:
# split line into words
words = line.split()
if "new high speed USB device using ehci_hcd and address" in line:
# get port number from last field
port = int(words[-1])
and so forth. Must simpler.
Regarding counters:
# at start of script:
counts = {} # dict of counter based on port (or better, (device, port))
# when new device seen (nb: possibly print out accumulated prior count value)
count[port] = 0
# when new error seen
count[port] += 1
Chase CSV as a totally separat thing later; just use print() for now.
Cheers,
Cameron Simpson <c...@zip.com.au>
I am of course experienced in teaching and have read the writings of Socrates.
- egnil...@phoenix.princeton.edu
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