Day 12 | Introduction to Pandas
Complexity
Time complexity: O(n)
Space complexity: O(n)
Code
# Complexity
- Time complexity: O(n)
- Space complexity: O(n)

# Code
```pythondata []
import pandas as pd

def concatenateTables(df1: pd.DataFrame, df2: pd.DataFrame) -> pd.DataFrame:
    return pd.concat([df1, df2], axis=0)
```
['Python3', 'Pandas']