I need a bar graph with three variables at the same time

I need a bar graph with three columns at the y axis: rating_standard, rating_rapid, rating_blitz.

I attach a graph similar to my request.

df_7 = df3[(df3['fide_id'] == 14109336)]

df_7

assuming your df_7 is a pandas DataFrame, there are two ways to do this:

easiest way:

df_7.plot(kind='bar',x='month',y=['rating_standard','rating_rapid','rating_blitz'])

another way using seaborn, you can first change the way the data is stored in it like this:

df = df.melt(id_vars=['month'], 
        value_vars=['rating_standard','rating_rapid','rating_blitz'], 
        var_name='rating',
        value_name='value', 
        )

it will make the table as:

	month	rating	    value
0	1	rating_standard	2530.0
1	2	rating_standard	2530.0
2	3	rating_standard	2546.0
3	4	rating_standard	2546.0
4	1	rating_rapid	2599.0

where those rating columns are now a variable, i.e. each row in the original table now corresponds to 3 rows in the new table. Then you can use seaborn as the following:

import seaborn as sns
sns.barplot(data=df, x='month', y='value', hue='rating')

let me know if you want to be exactly like the image you shared, like the month names, colors, etc. then we can make some changes.