$ git clone https://github.com/smallfish/hello.git
$ cd hello
$ go build hello.go

or use "go get":
$ go get github.com/smallfish/hello
$ ls $GOPATH/bin/hello

$ ./hello
  -file="": host:port file
  -limit=10: limit concurrency, default: 10
  -timeout=5: connect timeout, default: 5

$ python hello.py 
  Usage: hello.py --file=urlfile --limit=1000 --timeout=5

  Options:
    -h, --help         show this help message and exit
    --file=FILE        host:port file
    --limit=LIMIT      limit concurrency, default: 10
    --timeout=TIMEOUT  connect timeout, default: 5

$ cat urlfile
twitter.com:80
youtube.com:80
qq.com:80
dev.twitter.com:80
163.com:80
google.com:80
sohu.com:80

$ ./hello -file=urlfile 
163.com:80      OK
dev.twitter.com:80      OK
google.com:80   OK
qq.com:80       OK
sohu.com:80     OK
twitter.com:80  ERROR
youtube.com:80  ERROR

$ python hello.py --file=urlfile --limit=1000 --timeout=2
twitter.com:80  ERROR
youtube.com:80  ERROR
qq.com:80       OK
dev.twitter.com:80      ERROR
163.com:80      OK
google.com:80   OK
sohu.com:80     OK