如何将列分隔符添加到 Pandas 数据框显示

Question

For example, define

df=pd.DataFrame(np.random.randint(0,10,(6,6)))
df

Which gives below display in Jupyter notebook

My question is that is it possible to add a column delimiter to the dataframe like

---

Thank you for all the answers, currently I use below custom functions

def css_border(x,pos):
        return ["border-left: 1px solid red" if i in pos else "border: 0px" for i, col in enumerate(x)]
def display_df_with_delimiter(df,pos):
    return df.style.apply(partial(css_border,pos=pos), axis=1)

and

display_df_with_delimiter(df,[0,1,2,5])

gives

Answer 1

This piece of code should add the desired lines to the table.

from IPython.display import display, HTML

CSS = """
.rendered_html td:nth-child(even) {
    border-left: 1px solid red;
}
"""

HTML('<style>{}</style>'.format(CSS))

Note that you can change the style of those linse by simply changing the definition of border-left attribute, ie border-left: 2px solid green to make the lines thicker and green.

Here is a snapshot demonstrating the output.

Answer 2

Try with pandas.style.apply(...) :

from IPython.core.display import display, HTML

def css_border(x):
    return ["border-left: 1px solid red" if (i%2==0) else "border: 0px" for i, col in enumerate(x)]

html = (
    df.style.apply(css_border, axis=1).render()
)
display(HTML(html))

Answer 3

Usually, we do this:

df[[0,1,2,3]]

and it will print columns 0 to 3 - if you want columns 0-1 and 2-3 printed separately:

from IPython.display import display, HTML

CSS = """
.output {
    flex-direction: row;
}
"""

HTML('<style>{}</style>'.format(CSS))

and then call display for dataframe as:

display(df[[0,1]])
display(df[[2,3]])

Let me know if this helps!

UPDATE: Add lines in CSS as follows:

CSS = """
.rendered_html td:nth-last-child(2n) {
    border-right: 1px solid red;
}
"""

It adds red lines for every 2nd column - ofcourse you can edit the number of 'n' here as you like.

Hope this helps!

UPDATE: UPDATE: for every n-value CSS:

def delimit_views(delimiters):
    output = str()
    for delim in delimiters:
       output += ".rendered_html td:nth-child("+str(delim)+") {
       border-left: 1px solid red;}"
    return output

And now append this CSS to the HTML for your display.

Hope it works this time!