将字符串数据存储在变量中，然后在一天结束时使用双引号而不是单引号将批处理变量导出到JSON文件

Question

让这段代码在Raspberry Pi上运行。我通过将数据附加到JSON文件来正常工作，但程序会随着文件大小的增加而崩溃。我相信这是因为SD卡的读/写速度太慢了。保存到内存并在一天结束时转储一直很好，但JSON文件不正确。我需要这些文件有双引号而不是单引号，是正确的JSON。任何想法将不胜感激！

import RPi.GPIO as GPIO
import time
import datetime
def program():
    import json
    global count, pulse_start, pulse_end, pulse_duration, jsondata

    ts = time.time()
    hourofday = datetime.datetime.fromtimestamp(ts).strftime('%H%M')
    st = datetime.datetime.fromtimestamp(ts).strftime('%m-%d-%Y %H:%M:%S')
    to = datetime.datetime.fromtimestamp(ts).strftime('%H:%M:%S')
    do = datetime.datetime.fromtimestamp(ts).strftime('%m-%d-%Y')

    GPIO.setmode(GPIO.BCM)

    TRIG = 23
    ECHO = 24

    GPIO.setup(TRIG, GPIO.OUT)
    GPIO.setup(ECHO, GPIO.IN)
    GPIO.output(TRIG, False)

    time.sleep(2.5)

    GPIO.output(TRIG, True)

    time.sleep(0.00001)

    GPIO.output(TRIG, False)

    while GPIO.input(ECHO) == 0:

        pulse_start = time.time()

    while GPIO.input(ECHO) == 1:
        pulse_end = time.time()

    pulse_duration = pulse_end - pulse_start

    distance = pulse_duration * 17150
    distance = round(distance, 2)

    GPIO.cleanup

    #for testing
    distance = 1
    if distance < 150:

        count = count + 0.5
        counter = str({"datetime": st, "time": to, "date": do, "Count": "0.5"})
        jsonlist = [jsondata, ",",  counter]
        jsondata = ''.join(jsonlist)
        print("Record added memory. There have been ", count, "customers so far today.")

    if hourofday == "2359":
        import json

        with open('counter-' + do + '.json', 'a') as json_file:
            jsonlist = ["[", jsondata, "]"]
            jsondata = ''.join(jsonlist)
            json_file.write(jsondata)
        print("File counter-", do, ".json created and saved.")
        time.sleep(60)
        count = 0
        now = datetime.datetime.now()
        fulldate = now.date()
        jsondata = str({"index": {"_index": "customer-%s" % fulldate, "_type": "json_file"}})


count = 0
flag = True
now = datetime.datetime.now()
fulldate = now.date()
jsondata = str({"index": {"_index": "customer-%s" % fulldate, "_type": "json_file"}})

while flag:

    program()

我在文件中输出如下：

[{'index': {'_index': 'customer-2017-12-19', '_type': 'json_file'}},{'date': '12-19-2017', 'Count': '0.5', 'time': '16:34:55', 'datetime': '12-19-2017 16:34:55'},{'date': '12-19-2017', 'Count': '0.5', 'time': '16:34:57', 'datetime': '12-19-2017 16:34:57'},{'date': '12-19-2017', 'Count': '0.5', 'time': '16:35:00', 'datetime': '12-19-2017 16:35:00'}]

因为这是JSON，所以我需要所有单引号都是双引号才能使用。我试图在一个脚本中完成所有这一切，而不必有一个脚本来转换它。