fix append with a specific version of pandas==2.0.3

[skon7]

No description provided.

[skon7]

The issue here is related to the usage of the append method in pandas. In previous versions of pandas (before pandas 2.0), the append method was available for DataFrame objects. However, starting from pandas 2.0, the append method was removed from pandas.

To address this, i use an alternative methods like _append or concat to combine DataFrames.

To maintain a stable and reproducible development environment, it is highly recommended to explicitly specify the exact package versions in your requirements.txt file. This practice helps prevent conflicts between package dependencies and ensures that all team members are working with the same set of dependencies, reducing the chances of compatibility issues and making collaboration smoother.