Python Timer和TimerFPS计时工具类代码示例

本篇文章小编给大家分享一下Python Timer和TimerFPS计时工具类代码示例，文章代码介绍的很详细，小编觉得挺不错的，现在分享给大家供大家参考，有需要的小伙伴们可以来看看。

以下工具类代码来自开源项目pyslam

Timer

import cv2
 
class Colors(object):
    '''
    Colors class:reset all colors with colors.reset; two  
    sub classes fg for foreground  
    and bg for background; use as colors.subclass.colorname. 
    i.e. colors.fg.red or colors.bg.greenalso, the generic bold, disable,  
    underline, reverse, strike through, 
    and invisible work with the main class i.e. colors.bold
    '''
    reset='33[0m'
    bold='33[01m'
    disable='33[02m'
    underline='33[04m'
    reverse='33[07m'
    strikethrough='33[09m'
    invisible='33[08m'
    class fg: 
        black='33[30m'
        red='33[31m'
        green='33[32m'
        orange='33[33m'
        blue='33[34m'
        purple='33[35m'
        cyan='33[36m'
        lightgrey='33[37m'
        darkgrey='33[90m'
        lightred='33[91m'
        lightgreen='33[92m'
        yellow='33[93m'
        lightblue='33[94m'
        pink='33[95m'
        lightcyan='33[96m'
    class bg: 
        black='33[40m'
        red='33[41m'
        green='33[42m'
        orange='33[43m'
        blue='33[44m'
        purple='33[45m'
        cyan='33[46m'
        lightgrey='33[47m'
 
class Printer(object):
    @staticmethod
    def red(*args, **kwargs):
        print(Colors.fg.red, *args, **kwargs)
        print(Colors.reset, end="")
 
    @staticmethod
    def green(*args, **kwargs):
        print(Colors.fg.green, *args, **kwargs)
        print(Colors.reset, end="")
 
    @staticmethod
    def blue(*args, **kwargs):
        print(Colors.fg.blue, *args, **kwargs)
        print(Colors.reset, end="")        
        
    @staticmethod
    def cyan(*args, **kwargs):
        print(Colors.fg.cyan, *args, **kwargs)
        print(Colors.reset, end="")             
        
    @staticmethod
    def orange(*args, **kwargs):
        print(Colors.fg.orange, *args, **kwargs)
        print(Colors.reset, end="")     
        
    @staticmethod
    def purple(*args, **kwargs):
        print(Colors.fg.purple, *args, **kwargs)
        print(Colors.reset, end="")  
        
    @staticmethod
    def yellow(*args, **kwargs):
        print(Colors.fg.yellow, *args, **kwargs)
        print(Colors.reset, end="")                                   
 
    @staticmethod
    def error(*args, **kwargs):
        print(Colors.fg.red, *args, **kwargs, file=sys.stderr)
        print(Colors.reset, end="")        
 
 
 
#timer_print = print 
timer_print = Printer.cyan 
 
class Timer: 
    def __init__(self, name = '', is_verbose = False):
        self._name = name 
        self._is_verbose = is_verbose
        self._is_paused = False 
        self._start_time = None 
        self._accumulated = 0 
        self._elapsed = 0         
        self.start()
 
    def start(self):
        self._accumulated = 0         
        self._start_time = cv2.getTickCount()
 
    def pause(self): 
        now_time = cv2.getTickCount()
        self._accumulated += (now_time - self._start_time)/cv2.getTickFrequency() 
        self._is_paused = True   
 
    def resume(self): 
        if self._is_paused: # considered only if paused 
            self._start_time = cv2.getTickCount()
            self._is_paused = False                      
 
    def elapsed(self):
        if self._is_paused:
            self._elapsed = self._accumulated
        else:
            now = cv2.getTickCount()
            self._elapsed = self._accumulated + (now - self._start_time)/cv2.getTickFrequency()        
        if self._is_verbose is True:      
            name =  self._name
            if self._is_paused:
                name += ' [paused]'
            message = 'Timer::' + name + ' - elapsed: ' + str(self._elapsed) 
            timer_print(message)
        return self._elapsed                

用法

import Timer
timer = Timer(is_verbose=True)
timer.start()
 
# 此处是你的代码
 
timer.elapsed()

效果

TimerFps

在上面的基础上，再加上下面代码段：

import os
import numpy as np
import cv2
import math 
 
class MovingAverage:
    def __init__(self, average_, compute_sigma = False):    
        self._average_width = average_width
        self._idx_ring = 0
        self._average = 0
        self._sigma2 = 0
        self._is_init = False 
        self._is_compute_sigma = compute_sigma
        self._one_over_average_width_min_one = 1./(average_width-1)
        self._ring_buffer = np.zeros(average_width)
 
    def init(self, initVal=None):
        if initVal is None:
            initVal = 0. 
        self._ring_buffer = np.full(self._average_width, initVal, dtype=np.float32)        
        self._average    = initVal;    
        self._sigma2    = 0;
        self._is_init    = True;        
 
    def getAverage(self, new_val=None):
        if not self._is_init: 
            self.init(new_val)
        if new_val is None:
            return self._average            
        averageOld    = self._average
        oldVal        = self._ring_buffer[self._idx_ring]
        self._average += (new_val - oldVal)/self._average_width
        if self._is_compute_sigma:
            self._sigma2    =  self._sigma2 + self._one_over_average_width_min_one*(self._average_width*(averageOld*averageOld - self._average*self._average) - oldVal*oldVal + newVal*newVal)
        self._ring_buffer[self._idx_ring]    = new_val
        self._idx_ring = (self._idx_ring + 1) % self._average_width
        return self._average
 
    def getSigma(self):
        return  math.sqrt(max(self._sigma2,0.))       
 
 
class TimerFps(Timer):
    def __init__(self, name='', average_, is_verbose = True): 
        super().__init__(name, is_verbose)   
        self.moving_average = MovingAverage(average_width)
 
    def refresh(self): 
        elapsed = self.elapsed()
        self.moving_average.getAverage(elapsed)
        self.start()
        if self._is_verbose is True:
            dT = self.moving_average.getAverage()
            name =  self._name
            if self._is_paused:
                name += ' [paused]'            
            message = 'Timer::' + name + ' - fps: ' + str(1./dT) + ', T: ' + str(dT)
            timer_print(message)

用法

import TimerFps
timer = TimerFps(name='')
timer.start()
 
# 这里是你的代码
 
timer.refresh()

效果