environment/lib/python2.7/site-packages/psutil/__init__.py
def get_cpu_percent(self, interval=0.1):
        """Return a float representing the current process CPU
        utilization as a percentage.

        When interval is > 0.0 compares process times to system CPU
        times elapsed before and after the interval (blocking).

        When interval is 0.0 or None compares process times to system CPU
        times elapsed since last call, returning immediately.
        In this case is recommended for accuracy that this function be
        called with at least 0.1 seconds between calls.
        """
        blocking = interval is not None and interval > 0.0
        if blocking:
            st1 = sum(cpu_times())
            pt1 = self._platform_impl.get_cpu_times()
            time.sleep(interval)
            st2 = sum(cpu_times())
            pt2 = self._platform_impl.get_cpu_times()
        else:
            st1 = self._last_sys_cpu_times
            pt1 = self._last_proc_cpu_times
            st2 = sum(cpu_times())
            pt2 = self._platform_impl.get_cpu_times()
            if st1 is None or pt1 is None:
                self._last_sys_cpu_times = st2
                self._last_proc_cpu_times = pt2
                return 0.0

        delta_proc = (pt2.user - pt1.user) + (pt2.system - pt1.system)
        delta_time = st2 - st1
        # reset values for next call in case of interval == None
        self._last_sys_cpu_times = st2
        self._last_proc_cpu_times = pt2

        try:
            # the utilization split between all CPUs
            overall_percent = (delta_proc / delta_time) * 100
        except ZeroDivisionError:
            # interval was too low
            return 0.0
        # the utilization of a single CPU
        single_cpu_percent = overall_percent * NUM_CPUS
        # on posix a percentage > 100 is legitimate
        # http://stackoverflow.com/questions/1032357/comprehending-top-cpu-usage
        # on windows we use this ugly hack to avoid troubles with float
        # precision issues
        if os.name != 'posix':
            if single_cpu_percent > 100.0:
                return 100.0
        return round(single_cpu_percent, 1)
def get_cpu_percent(self, interval=0.1):
        """Return a float representing the current process CPU
        utilization as a percentage.

        When interval is > 0.0 compares process times to system CPU
        times elapsed before and after the interval (blocking).

        When interval is 0.0 or None compares process times to system CPU
        times elapsed since last call, returning immediately.
        In this case is recommended for accuracy that this function be
        called with at least 0.1 seconds between calls.
        """
        blocking = interval is not None and interval > 0.0
        if blocking:
            st1 = sum(cpu_times())
            pt1 = self._platform_impl.get_cpu_times()
            time.sleep(interval)
            st2 = sum(cpu_times())
            pt2 = self._platform_impl.get_cpu_times()
        else:
            st1 = self._last_sys_cpu_times
            pt1 = self._last_proc_cpu_times
            st2 = sum(cpu_times())
            pt2 = self._platform_impl.get_cpu_times()
            if st1 is None or pt1 is None:
                self._last_sys_cpu_times = st2
                self._last_proc_cpu_times = pt2
                return 0.0

        delta_proc = (pt2.user - pt1.user) + (pt2.system - pt1.system)
        delta_time = st2 - st1
        # reset values for next call in case of interval == None
        self._last_sys_cpu_times = st2
        self._last_proc_cpu_times = pt2

        try:
            # the utilization split between all CPUs
            overall_percent = (delta_proc / delta_time) * 100
        except ZeroDivisionError:
            # interval was too low
            return 0.0
        # the utilization of a single CPU
        single_cpu_percent = overall_percent * NUM_CPUS
        # on posix a percentage > 100 is legitimate
        # http://stackoverflow.com/questions/1032357/comprehending-top-cpu-usage
        # on windows we use this ugly hack to avoid troubles with float
        # precision issues
        if os.name != 'posix':
            if single_cpu_percent > 100.0:
                return 100.0
        return round(single_cpu_percent, 1)
Return a float representing the current process CPU
        utilization as a percentage.

        When interval is > 0.0 compares process times to system CPU
        times elapsed before and after the interval (blocking).

        When interval is 0.0 or None compares process times to system CPU
        times elapsed since last call, returning immediately.
        In this case is recommended for accuracy that this function be
        called with at least 0.1 seconds between calls.