Add a percent sign to a dataframe column in Python
<p>I've been attempting to add a percent sign to a column in my dataframe but to no avail. Would anyone have any idea?</p>

<pre><code>import pandas as pd

names = ('jimmy', 'red', 'julie', 'brad', 'oranges')
score = (82, 38 , 55, 19, 33)

df = pd.DataFrame({'Name': names, 'Grade': score})

df
Out[20]: 
   Grade     Name
0     82    jimmy
1     38      red
2     55    julie
3     19     brad
4     33  oranges
</code></pre>

<p>I've made numerous attempts but nothing seems to work out. Here is one failed attempt:</p>

<pre><code>df['Percent'] = str(df['Grade']) + '%'
df['Percent']
Out[22]: 
0    0    82\n1    38\n2    55\n3    19\n4    33\nN...
1    0    82\n1    38\n2    55\n3    19\n4    33\nN...
2    0    82\n1    38\n2    55\n3    19\n4    33\nN...
3    0    82\n1    38\n2    55\n3    19\n4    33\nN...
4    0    82\n1    38\n2    55\n3    19\n4    33\nN...
Name: Percent, dtype: object
</code></pre>