How to streamingly read text file and display whenever updated text
#!/usr/bin/python
import time
f = open('/home/martin/Downloads/a.txt')
while 1:
for line in f:
print line;
time.sleep(1);
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Re: How to streamingly read text file and display whenever updated text
gale...@gmail.com於 2013年10月5日星期六UTC+8下午3時38分51秒寫道：
> #!/usr/bin/python
>
> import time
>
> f = open('/home/martin/Downloads/a.txt')
>
> while 1:
>
> for line in f:
>
> print line;
>
> time.sleep(1);
if __name__ == '__main__':
logfile = open("/home/martin/Downloads/a.txt","r");
while True:
line = logfile.readline();
if not line:
print line;
time.sleep(1);
this also failed
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Re: How to streamingly read text file and display whenever updated text
Joost Molenaar於 2013年10月5日星期六UTC+8下午7時02分05秒寫道：
> A bit of googling found me this:
>
> http://www.linux-support.com/cms/implementation-of-tail-in-python/
>
>
>
> import time
>
> import sys
>
>
>
> def tail_f(file):
>
> interval = 1.0
>
> while True:
>
> where = file.tell()
>
> line = file.readline()
>
> if not line:
>
> time.sleep(interval)
>
> file.seek(where)
>
> else:
>
> yield line
After tried many times, updated text file is not shown, it only print text at
the first time.
#!/usr/bin/python
import time
import sys
import thread
def tail_f(filehandler):
interval = 1.0
while True:
try:
line = filehandler.readline()
where = filehandler.tell()
if not line:
time.sleep(interval)
filehandler.seek(where)
else:
yield line
except:
print "tail_f error"
def readfile(systemname):
try:
filehandler = open("/home/martin/Downloads/a.txt","r");
while 1:
#for line in tail_f(filehandler):
# print line
try:
interval = 1.0
line = filehandler.readline()
where = filehandler.tell()
if not line:
time.sleep(interval)
filehandler.seek(where)
print where
else:
print line
except:
print "tail_f error"
except:
print "Error: readfile"
if __name__ == '__main__':
try:
thread.start_new_thread( readfile, ("Thread-1", ) )
except:
print "Error: unable to start thread"
while 1:
pass
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Re: How to streamingly read text file and display whenever updated text
I can start thread and no exception error print, and I do not know how to use tail in python script I need to cope with MySQL in python later as all file path stored in it, it is to monitor all text files -- https://mail.python.org/mailman/listinfo/python-list
Re: How to streamingly read text file and display whenever updated text
https://docs.google.com/file/d/0B2D69u2pweEvelh1T25ra19oZEU/edit?usp=sharing no matter call tail directly in python or using the script of tail all failed it seems it can not read next line -- https://mail.python.org/mailman/listinfo/python-list
