Pandas add leading zero to column with both negative and positive values

I want to add a leading zero for all rows in a column. Here is what the column looks like:

Desired output:

I tried using zfill but it doesn’t take care of the negative values.

df['value'] = df['value'].astype(str).str.zfill(2)

>Solution :

Try the following :

    import pandas as pd
    
    data = {'value': [-1, 9, 10, -2]}
    df = pd.DataFrame(data)
    
    # Function to add leading zero
    def custom_zfill(x):
        if x < 0:
            return '-' + str(abs(x)).zfill(2)
        else:
            return str(x).zfill(2)
    
    df['value'] = df['value'].apply(custom_zfill)
    print(df)