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Hello, @Cyrille!

Am I correct to assume you want this in SageCell output? If that is the case, you can obtain bold fonts specifying manually that option: instead of 'a' in header_column, you can write r'<b>aa</b>'. The "r" just before the first simple quote sign indicates that this is a "raw string", so it must be used AS IS written by you; in this case, we are using a little bit of HTML, using the <b> and </b> to indicate bold font. So, you have to do:

rows = [[100,2,3], [4,5,60]]
show(t)


Now, I don't think this is exactly what you want. First of all, the aa and bb will appear to be blue. You can change that by using a little bit more of HTML:

rows = [[100,2,3], [4,5,60]]
show(t)


Finally, I understand that you want a frame for your table. You have to use the frame=True option:

rows = [[100,2,3], [4,5,60]]

rows = [[100,2,3], [4,5,60]]

However, do be careful, since the frame=True option already highlights the headers for the rows and columns by placing a double line separation, so perhaps using bold font is too much.
One more thing: If you don't like the alignment of the columns, remember you can always use the align='center' option.