从文本文件读取的行中提取值

Question

I want to extract the value of the bandwidth from line read from file using this code

  try:
        s1 = open(argv[1], "r")
  except IOError:
        print("server1: fopen");
        sys.exit(-1); 

 lines1 = s1.readlines()
 line1 = lines1[c]
 print line1
 f1 = re.split('.Bytes.*', line1)
 print f1

the line contains this expression

[  4]  0.0- 1.0 sec   218 KBytes  1.79 Mbits/sec

and

print f1

gives this value

['[  4]  0.0- 1.0 sec   218 ', '\n']

I want to read the last number with M letter then compute the number as

if M
  B = 1.79*1000000
else if K
  B = 1.79*1000

and B must be floating point number

How can I extract the last value?

Answer 1

You could do this aswell without regex.

splitted = filter(None, line1.split())
speed = float(splitted[-2])
unit = splitted[-1]
if "M" in unit:
    B = speed*1000000
else if "K" in unit
    B = speed*1000

Let me know how it works -- I haven't tested it yet.