问题

我制作了一个简单的计数器，这样我可以查看是否可以从一个程序中存储数据，并在下次运行时保留它，但我不确定该如何做到这一点。到目前为止，我有这个。如果你想知道以后我会用这个做什么，那就是为了一个pygame。

```python
import json, time
start = 0
with open("data.json", "r") as read_file:
  data = json.load(read_file)
while True:
  save = data
  with open("data.json", "w") as write_file:
    json.dump(save, write_file)
  with open("data.json", "r") as read_file:
    data = json.load(read_file)
    if data=={'part': 0}:
      print("Works")
  start = start + 1
  time.sleep(1)
  print(data)
  save = data

当你运行这段代码时，你会看到它不会继续计数，它只会重置并重新开始。

<details>
<summary>英文:</summary>

I made a simple counter so I can see if I can store data from one program and keep it for the next time I run it however I&#39;m not sure how I can do that. This is what I&#39;ve got so far. If your wondering what I&#39;ll use this for afterword&#39;s its for a pygame.

import json, time
start = 0
with open("data.json", "r") as read_file:
data = json.load(read_file)
while True:
save = data
with open("data.json", "w") as write_file:
json.dump(save, write_file)
with open("data.json", "r") as read_file:
data = json.load(read_file)
if data=={'part': 0}:
print("Works")
start = start + 1
time.sleep(1)
print(data)
save = data

As you may see when you run this code it doesn't continue counting it only resets and starts again.

</details>


# 答案1
**得分**: 0

这里有一些问题：

```python
import json, time
start = 0

with open("data.json", "r") as read_file:
  data = json.load(read_file)

while True:
  save = data
  # 不必要的变量赋值！你可以保持它为 'data'
  with open("data.json", "w") as write_file:
    json.dump(save, write_file)
  # 你在这里反复读取和写入数据：如果你仍然将其保留在内存中，为什么不直接将数据写入文件，而不是反复进行这些操作？
  with open("data.json", "r") as read_file:
    data = json.load(read_file)
    if data == {'part': 0}:
      # 比较值而不是整个字典对象
      print("Works")
  start = start + 1
  # start 现在是 1
  time.sleep(1)
  print(data)
  save = data

这可能更好地写成：

game_data = {'yourdata': 1}

def save_game_data(data):
    with open("data.json", "w") as write_file:
        json.dump(data, write_file)

def load_game_data():
    # 检查数据是否存在
    try:
        with open("data.json", "r") as read_file:
            return json.load(read_file)
    except FileNotFoundError:
        # 如果找不到文件，创建新的游戏数据
        return game_data

然后，你可以使用循环定期将数据转储到 JSON 文件中，如下所示：

import json, time

current_save = load_game_data()

while True:
    save_game_data(current_save)
    if current_save['yourdata'] == 1:
        print("Works")
    current_save['yourdata'] += 1
    time.sleep(1)
    print(current_save)

这个循环加载当前的存档或开始一个新的存档，然后使用函数在每个循环中保存数据。你可能需要考虑一些问题：你是否想要重复保存？你希望保存之间有多长时间？是否允许用户触发保存功能？这个循环会产生什么成本？你可以考虑仅在修改数据或满足特定条件时才保存数据，而不是在每次循环迭代中都保存数据。

import json, time
start = 0

with open("data.json", "r") as read_file:
  data = json.load(read_file)

while True:
  save = data
# unnecessary variable assignment! you can just keep it as 'data'
  with open("data.json", "w") as write_file:
    json.dump(save, write_file)
# you're repeatedly reading and writing the data here: why not set it to just write the data if you're keeping it in memory anyway?
  with open("data.json", "r") as read_file:
    data = json.load(read_file)
    if data=={'part': 0}:
# compare values and not the whole dict object
      print("Works")
  start = start + 1
# start is now 1
  time.sleep(1)
  print(data)
  save = data

game_data = { 'yourdata' : 1 }

def save_game_data(data):
    with open("data.json", "w") as write_file:
        json.dump(data, write_file)

def load_game_data():
    # check to see if data exists
    try:
        with open("data.json", "r") as read_file:
            return json.load(read_file)
    except FileNotFoundError:
        # if you can't find the file, create new game data
        return game_data

import json, time

current_save = load_game_data()

while True:
    save_game_data(current_save)
    if current_save['yourdata']==1:
        print("Works")
    current_save['yourdata'] += 1
    time.sleep(1)
    print(current_save)