(Pandas) Add a percentage symbol to the percentage

Question

For example, I have a dataframe that looks like this

category  numbers
a         100
b         200
c         200

And I want to add a column that present their percentages(with the percentage symbol). So this is what I’ve tried

df['percentage'] = str(100 * df['numbers']/df['numbers'].sum()) + '%'

However, this would return a list of number

category  numbers  percentage
a         100      0 20.00 1 40.00 2 40.00 Name: numbers, dtype: float64%
b         200      0 20.00 1 40.00 2 40.00 Name: numbers, dtype: float64%
c         200      0 20.00 1 40.00 2 40.00 Name: numbers, dtype: float64%

What could I do to let it become 20% 40% 40%

Asked By: Cookfishbro

||

Source

Answer 1

As already commented by mozway, the key is to use .astype(str) which turns the value of each individual cell into a string, while str() gives you the string representation of the series as a whole.

>>> df = pd.DataFrame({"numbers": [100, 200, 200]})
>>> tmp = 100 * df.numbers / df.numbers.sum()
>>> tmp
0    20.0
1    40.0
2    40.0
Name: numbers, dtype: float64
>>> df["percentage"] = tmp.astype(str) + "%"
>>> df
   numbers percentage
0      100      20.0%
1      200      40.0%
2      200      40.0%

Answered By: fsimonjetz

(Pandas) Add a percentage symbol to the percentage

Question:

Answers: