Hi@MD,
You can use the append function to add new data in your DataFrame. You can go through the below example.
df1 = pd.DataFrame({"x":[25,15,12,19],"y":[47, 24, 17, 29]}) 
df2 = pd.DataFrame({"x":[25, 15, 12],"y":[47, 24, 17],"z":[38, 12, 45]}) 
df1.append(df2, ignore_index = True)   
| x | 
y | 
z | 
| 0 | 
25 | 
47 | 
NaN | 
| 1 | 
15 | 
24 | 
NaN | 
| 2 | 
12 | 
17 | 
NaN | 
| 3 | 
19 | 
29 | 
NaN | 
| 4 | 
25 | 
47 | 
38.0 | 
| 5 | 
15 | 
24 | 
12.0 | 
| 6 | 
12 | 
17 | 
45.0 | 
I hope this will help you.