python - 我尝试以 100hz 采样，而不是按照程序运行的速度采样。我该怎么做呢？

Question

我有一个程序，在其中我只是打印到 csv，我想要每秒正好 100 个样本点，但我不知道从哪里开始或如何做!请帮忙!

from datetime import datetime
import pandas as pd


i = 0
data = []

filename = 'Data.csv'
hz = 0
count = 0
while True:
    #start = process_time()
    if i == 0:
        Emptydf = pd.DataFrame([], columns = ['COUNT', 'TIME'])
        (Emptydf).to_csv('Data.csv', index = False)

    curr_time = datetime.now()
    str_milli = curr_time.strftime("%f")[:2]
    milliseconds = int(str_milli)
    timestamp = curr_time.strftime("%H:%M:%S.%f")
    datarow = {'Count': i, 'TIME' : timestamp}

    #diff = curr_time -  past time of 0.01 milli seconds

    #if diff >= 0.01:
        data.append(datarow)



    #time.sleep(.006)
    if i%10 == 0:
        dataframe = pd.DataFrame(data)
        (dataframe).to_csv('Data.csv', mode = 'a', header = False, index = False)


    #print(dataframe)

    data.clear()

i += 1

Answer 1

下面是一个每秒递增计数器 100 次的示例:

import time

FREQ_HZ = 100.

count = 0
start_time = time.time()
try:
  while True:
    count += 1
    time.sleep(count / FREQ_HZ - (time.time() - start_time))
except:
  print("%.2f iter/second\n" % (count / (time.time() - start_time)))

要进行测试，请让它运行一会儿，然后点击 ^C。