Python: Finding a negative number in a line of text from a file -

i have program polls servers current wi-fi status every minute, , saves info .txt file. output is:

*****current wifi signal strength*****: link quality=57/70 signal level=-53 dbm

the text file contains many of these lines. i'm trying accomplish is: -find signal dbm values in lines, , append them array can can other functions such sort , average. can't seem working quite right.

does know how this?

thank you!

i go through each line in file , split line @ =, last value, split @ space, , first value yield -53.

strengthvalues = [] f = open("input.txt", "r") filelines = f.readlines() line in filelines:     linesplit = line.split('=')     strengthvalues.append(linesplit[-1].split()[0]) print strengthvalues 

or list comprehension:

f = open("test.txt", "r") filelines = f.readlines() strengthvalues = [line.split('=')[-1].split()[0] line in filelines] print strengthvalues