# File I/O

This example shows how to save data in a pickle file (with a *.bio extension) using the pre-implemented function. The special feature of this function is that the data is added to the file without reading the whole file, so it is a fast way to save data to a binary file inside a loop.
So it's a quick way to save data to a binary file inside a loop. You might want to do this for the online data stream in case of a malfunction and to not fill a table with too much data.
The file can then be read using the load function which concatenates all the data in the file and returns a dictionary containing all the data.
Keep in mind that the load function has to read each row one after the other, so if you have a lot of rows, it may take a while.
The load function takes the number of lines you want to read as an argument in case it opens too slowly.

```
import os
from biosiglive import save, load
import numpy as np

if __name__ == "__main__":
    data = {
        "data_np": np.random.rand(2, 20),
        "data_list": [5, 8],
        "data_dict": {"data_np": np.random.rand(2, 20)},
        "data_int": 1,
    }
    i = 0
    while i != 50:
        save(data, "test")
        i += 1
    data_loaded = load("test.bio")
    os.remove("test.bio")
```