Pandas DataFrame add_suffix() Method
Example
Insert "_data" after each column label:
    import pandas as pd
data = {
  "age": [50, 40, 30, 40, 20, 
    10, 30],
  "qualified": [True, False, False, False, False, True, 
    True]
}
df = 
    pd.DataFrame(data)
newdf = df.add_suffix("_after")
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Definition and Usage
The add_suffix() method inserts the 
specified value at the end of each column label.
To add a value before the column label, use the  
add_prefix() method.
Syntax
  
    dataframe.suffix(prefix)
  
Parameters
| Parameter | Description | 
|---|---|
| prefix | Required. A string to add after the column labels | 
Return Value
A DataFrame with the result.
This method does not change the original DataFrame.