Question

环境：Unix Python版本：2.7

我有一个场景，我从API中获取一些数据，然后将其存储在文本文件中。我正在使用间隔30分钟的预定cron作业运行python脚本。如果count的值增加1，则运行它时，如果没有，则先前的值增加/减少，然后运行相同。我想要实现的是，如果计数在第一次运行时增加，我会暂时存储该值，然后在下一次运行后再次运行30分钟后应该与之前的值进行比较，而不是最近增加/减少的计数，然后如果计数仍然增加/减少然后永久存储并继续进行。

码

def app_counts():

    while True:
        try:
            url_node = os.popen("ApiURL").read()
            node_data = json.loads(url_node)
        except BaseException as exp:
            continue
        break
    process_num = (node_data[0]["proc"])
    node_count = len(process_num)
    print ("...........................................")
    f_check = file("/home/user/app_check/file.txt",'r')
    f_data = f_check.read()
    chk_data = int(f_data)
############################write increased count to file######################################################
    f1 = open("file.txt", "w")
    n1 = f1.write(str(node_count) + "\n")
    f1.close() #Here I want to store the current increased count temporarily(for example if count is increased/decreased store it temporarily and from next run compare it from previous one still if it is increased then store permanently)

def app_acc():
    comp_n = recent_node_counts()
    f2 = file("/home/user/app_check/file.txt",'r') ## reads last value of count
    r_data = f2.read()
    cmp_n = int(r_data)
    if(comp_n < cmp_n ):

          sys.exit(1) ### fail the build forcefully
    else:
          print ('OK ')
          print 'recent count = ', comp_n

我是python的新手，任何人都可以帮助实现这个目标，我应该用什么才能实现这个目标。

Answer 1

你的json文件看起来像这样

{
    "latest": 5,
    "history": [1, 2, 3, 4]
}

基本上，我将最近的节点计数值存储为latest并维护history（最近的节点计数值附加在它的末尾）。

import json


def get_data():
    # read json file data from previous run
    with open("/home/user/app_check/file.txt") as f_check:
        data = json.load(f_check)
    return data


def app_counts():
    ...
    node_count = len(process_num)
    ...
    data = get_data()
    # if value is increased from last, store it permanently
    if data['latest'] < node_count:
        data['history'].append(node_count)
    # update latest temporary count
    data['latest'] = node_count
    # write to json file
    with open("file.txt", "w") as f1:
        json.dump(data, f1)


def app_acc():
    comp_n = recent_node_counts()
    data = get_data()
    if(comp_n < data['latest']):
        sys.exit(1) ### fail the build forcefully
    else:
        print ('OK ')
        print 'recent count = ', comp_n

存储和检索文本文件中的值[python]

1 个答案: