fetching values from rrd file

[kaf3773]

Hi
I am trying to cycle through values i fetch from an rrd file with a python script and this is the code i have

output = rrdtool.fetch("mutime.rrd", 'AVERAGE')
trmaxTuples = output[2]
n  = len(trmaxTuples)
for n in trmaxTuples:
    if (trmaxTuples > 100):
        print n
    else:
        print "0"

Here is the result i get
(43.0,)
(46.0,)
(69.0,)
(41.0,)
(51.0,)
(62.0,)
(55.0,)

But i am trying to extract the values one at a time out of the brackets and use them in making a comparison.

I will appreciate your help very much.

Thanks

[bvdet]

You assign len(trmaxTuples ) to "n", but you reassign "n" to each element of trmaxTuples in the for loop. Do you want to print "n" if it is greater than 100? The following prints "n" if greater than 50.

trmaxTuples = ((43.0,),(46.0,),(69.0,),(41.0,),(51.0,),(62.0,),(55.0,))

for item in trmaxTuples:
    n = item[0]
    if n > 50:
        print n
    else:
        print "x"

The output:

>>> x
x
69.0
x
51.0
62.0
55.0
>>>

[kaf3773]

Smashing!! Thanks a lot bvdet this worked.

[kaf3773]

I am trying to extend this code for an rrd file with multiple datasources.

When i run this code

trmaxTuples = rrdtool.fetch("mutime.rrd", 'AVERAGE', '-s -2hr')
for item in trmaxTuples:
        n = item[1]
        if n > 50:
            print n
        else:
            print "x"

i get the results below

-bash-3.2$ /opt/csw/bin/python alarming.py 
1425417900
second
(9637507.0800000001, 10465039.640000001, 98183.733333333337, 84958.386666666673)
-bash-3.2$

When i run rrdtool fetch from the command line here is what i get

-bash-3.2$ /opt/csw/bin/rrdtool fetch mutime.rrd AVERAGE -s -2hr
                       first            second            third            fourth

1425410700: 9.7907263600e+06 1.0574282213e+07 9.9081866667e+04 8.6084040000e+04
1425411000: 9.6375070800e+06 1.0465039640e+07 9.8183733333e+04 8.4958386667e+04
1425411300: 9.5396297067e+06 1.0361895200e+07 9.7132146667e+04 8.4087973333e+04
1425411600: 9.4494586067e+06 1.0304070603e+07 9.6382913333e+04 8.3760376667e+04
1425411900: 9.4662621467e+06 1.0230560960e+07 9.6236346667e+04 8.3033670000e+04
1425412200: 9.3551098567e+06 1.0105500320e+07 9.4713120000e+04 8.2404246667e+04

I would appreciate if you can help me cycle through the values of first and i am assuming it will be the same way to cycle through the values of second, third and fourth which are the datasources in the rrd file.

Thanks

[kaf3773]

After a number of hours at this here is the code i came up with that works for me. improvements to this will be very much appreciated.

trmaxTuples = rrdtool.fetch("mutime.rrd", 'AVERAGE', '-s -2hr')
n = trmaxTuples[2]
p = 0
for p in range(len(n)):
    s = n[p]
    print s
    first = s[0]
    print first
    second = s[1]
    print second
    third = s[2]
    print third
    fourth = s[3]
    print fourth
p = p + 1