The following code gives me `A` for `i=1,2`. But then I want `A` for each `i` to append and give combined `A` i.e. for both `i=1,2`. I present the current and expected outputs.

```
import pandas as pd
import numpy as np

A=[]

for i in range(1,3):
    file_loc = f"C:\\Users\\USER\\OneDrive - Technion\\Research_Technion\\Python_PNM\\Sept12_2022\\{i}\\Test.xlsx"
    df = pd.read_excel(file_loc, index_col=None, na_values=['NA'], usecols="A,C:AA")
    A=df["N"].to_numpy()

    A = [x for x in A if str(x) != 'nan']

    A = [eval(e) for e in A]
    print([A])

```

The current output is

```
[[1], [2], [3], [4], [5]]
[[8], [4], [6], [2], [3]]

```

The expected output is

```
[[[1], [2], [3], [4], [5]],[[8], [4], [6], [2], [3]]]

```