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johnisevil

Member

From: Hamilton, ON Canada

Registered: 2003-08-07

Posts: 221

Website

Python math question

Any ideas as to why the last line always equals 0 when it shouldn't?

tmp = os.popen('free -m').readlines()
total = int(tmp[1].split()[1])
used = int(tmp[2].split()[2])
free = int(tmp[2].split()[3])
pused = (int(used) / int(free)) * 100

print pused

bleak

Member

Registered: 2004-05-11

Posts: 24

Re: Python math question

That's because you're doing an integer division. Do this instead:

pused = float(used) / free * 100

sweiss

Member

Registered: 2004-02-16

Posts: 635

Re: Python math question

Looks like you have more free space than used space, you should be happy

The division of 2 integers is an integer. The division is always less than 1 in your case, and so the integer which represents it is 0.

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Some PKGBUILDs: http://members.lycos.co.uk/sweiss3

sweiss

Member

Registered: 2004-02-16

Posts: 635

Re: Python math question

Ah, you were quicker

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cmp

Member

Registered: 2005-01-03

Posts: 350

Re: Python math question

btw. if you want to do an integer division, you don't have to use int on both operands, just use //.
a = 2.031
b = 3.5 * a
b // a