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我在以更 Pythonic 的方式重写长度 Python 代码时遇到了麻烦。这是我尝试过的，它还包含一个示例，我希望我的最终代码看起来像

#!/usr/bin/env python

import time
import itertools
import os

freq = [2400000,2000000,1600000,1200000,800000]

freq_set = [
        [ i for i in itertools.combinations(freq,1)],
        [ i for i in itertools.combinations(freq,2)],
        [ i for i in itertools.combinations(freq,3)],
        [ i for i in itertools.combinations(freq,4)]
        ]

cores = [[0,4],[1,5],[2,6],[3,7]]

sets = [[0,4],[0,4,1,5],[0,4,1,5,2,6],[0,4,1,5,2,6,3,7]]

# 5 10 10 5 ; 1 3 5 7
for freq_set_val in range(0, len(freq_set)):
        if freq_set_val == 0:
                change = "echo "+ freq_set[freq_set_val][0] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][0] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                print "do something"
                change = "echo "+ freq_set[freq_set_val][1] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][1] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                print "do something"
                change = "echo "+ freq_set[freq_set_val][2] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][2] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                print "do something"
                change = "echo "+ freq_set[freq_set_val][3] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][3] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                print "do something"
                change = "echo "+ freq_set[freq_set_val][4] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][4] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                print "do something"
        if freq_set_val == 1:
                change = "echo "+ freq_set[freq_set_val][0] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][0] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][1] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][2] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][1] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][3] + "/cpufreq/scaling_setspeed"
                print "do something"
                change = "echo "+ freq_set[freq_set_val][1] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][1] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][2] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][2] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][2] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][3] + "/cpufreq/scaling_setspeed"
                print "do something"
                change = "echo "+ freq_set[freq_set_val][2] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][2] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][3] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][2] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][3] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][3] + "/cpufreq/scaling_setspeed"
                print "do something"

                print "so onn"
        if freq_set_val == 2:

                change = "echo "+ freq_set[freq_set_val][0] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][0] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][0] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][1] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][1] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][2] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][1] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][3] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][2] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][4] + "/cpufreq/scaling_setspeed"
                change = "echo "+ freq_set[freq_set_val][2] +"> /sys/devices/system/cpu/cpu"+ sets[freq_set_val][5] + "/cpufreq/scaling_setspeed"
                print "do something"

本质上，我想继续翻转一组具有特定频率水平的内核。所以在每个change声明之后。我会写os.system(change)

你能帮帮我吗？我也尝试使用 shell 实现相同的功能。但问题是没有itertools包裹。请随时更改title of question我不知道如何表达它。

这就是它现在的样子。更漂亮的版本总是更好:) 但我不知道如何增强它

for freq_set_val in range(0, len(freq_set)):
        if freq_set_val == 0:
                for freq in range(0, len(freq_set[freq_set_val])):
                        for val in range(0, len(freq_set[freq_set_val][freq])):
                                change = "echo "+ str(freq_set[freq_set_val][freq][val]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][0]) + "/cpufreq/scaling_setspeed"
                                change = "echo "+ str(freq_set[freq_set_val][freq][val]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][1]) + "/cpufreq/scaling_setspeed"
                                print "do something"
        if freq_set_val == 1:
                for freq in range(0, len(freq_set[freq_set_val])):
                        change = "echo "+ str(freq_set[freq_set_val][freq][0]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][0]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][0]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][1]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][1]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][2]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][1]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][3]) + "/cpufreq/scaling_setspeed"
                        print "do something"

        if freq_set_val == 2:
                for freq in range(0, len(freq_set[freq_set_val])):
                        change = "echo "+ str(freq_set[freq_set_val][freq][0]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][0]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][0]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][1]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][1]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][2]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][1]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][3]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][2]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][4]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][2]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][5]) + "/cpufreq/scaling_setspeed"
                        print "do something"

        if freq_set_val == 3:
                for freq in range(0, len(freq_set[freq_set_val])):
                        change = "echo "+ str(freq_set[freq_set_val][freq][0]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][0]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][0]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][1]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][1]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][2]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][1]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][3]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][2]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][4]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][2]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][5]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][3]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][6]) + "/cpufreq/scaling_setspeed"
                        change = "echo "+ str(freq_set[freq_set_val][freq][3]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][7]) + "/cpufreq/scaling_setspeed"
                        print "do something"
4

2 回答 2

1

这是你想要的？

def change_freq(freq_set, freq_set_val, freq, i1, i2):
    change = "echo "+ str(freq_set[freq_set_val][freq][i1]) +"> /sys/devices/system/cpu/cpu"+ str(sets[freq_set_val][i2]) + "/cpufreq/scaling_setspeed"
    # os.system(change)

for freq_set_val in range(0, len(freq_set)):
    for freq in range(0, len(freq_set[freq_set_val])):       
        for i in range(0, (freq_set_val+1)*2): 
            change_freq(freq_set, freq_set_val, freq, i/2, i)

        if freq_set_val == 0:
            print "dosomething"
        if freq_set_val == 1:
            print "dosomething"
        if freq_set_val == 2:
            print "dosomething"
        if freq_set_val == 3:
            print "dosomething"
于 2013-08-10T11:33:09.370 回答
1

我真的不认为有 Pythonic 的方法可以做到这一点。一旦你深入到这种组合混乱中，你就不能希望得到本质上可读的东西。然而，这仍然可以做得相当紧凑。创建最合适的抽象将取决于您打算如何概括该模式，并且可能需要对基础数学有深刻的理解。（这让我想到了张量积，但是我的本科物理教育正在慢慢地但肯定会从我的认知掌握中消失......）我无法从你的例子中确切地看出你希望每个序列在哪里结束，或者你是否真的打算使用您在顶部生成的每个组合，但是像这样的几个函数可能是生成所需整数模式的起点（Python 2.7）：

def repeating_range(start, stop, repeat):
   return reduce(add,itertools.izip(*itertools.tee(xrange(start,stop),repeat)))

def collated_repeating_range(grouping, stop, repeat):
   return reduce(add,reduce(add,itertools.izip((repeating_range(start, start+grouping, repeat)
                                             for start in xrange(stop)))))

for freq_set_val in range(0, len(freq_set)):
   offset = freq_set_val+1
   for pair in itools.izip(collated_repeating_range(offset,5,2), itools.cycle(xrange(offset*2))):
      print pair
于 2013-08-10T12:28:15.227 回答