What if the data that is coming from the source is continuous? What if we need to read continuous data? This recipe will demonstrate a simple solution that will work for many common real-life scenarios, but it is not universal and you will need to modify it if you hit a special case in your application.
In this recipe, we will show you how to read an ever-changing file and print the output. We will use the common Python module to accomplish this as shown here:
import time
import os
import sys
if len(sys.argv) != 2:
print >> sys.stderr, "Please specify filename to read"
filename = sys.argv[1]
if not os.path.isfile(filename):
print >> sys.stderr, "Given file: \"%s\" is not a file" % filename
with open(filename,'r') as f:
# Move to the end of file
filesize = os.stat(filename)[6]
f.seek(filesize)
# endlessly loop
while True:
where = f.tell()
# try reading a line
line = f.readline...