tabulate has options headers and showindex

table = tb.tabulate(data, tablefmt='html', headers=df.columns, showindex=True)

st.markdown(table, unsafe_allow_html=True)

Source code: tabulate

You can also add CSS to change it

table = tb.tabulate(data, tablefmt='html', headers=df.columns, showindex=True)

st.write('<style>table th {font-size: 30px; color: red} table tr:nth-child(odd) td {background-color: #eee}</style>', unsafe_allow_html=True)

st.markdown(table, unsafe_allow_html=True)

But you may also use DataFrame to generate HTML without tabulate.
And it may use df.style with many functions to format every cell.

This example changes background for maximal and minimal value in columns A and B

df = pd.DataFrame(data)

def highlight_max(x, props):
    return np.where(x == np.nanmax(x.to_numpy()), props, None)
def highlight_min(x, props):
    return np.where(x == np.nanmin(x.to_numpy()), props, None)

df = df.style \
        .apply(highlight_max, props='background-color: #fed', subset=['A','B'], axis=0) \
        .apply(highlight_min, props='background-color: #afa', subset=['A','B'], axis=0)

html = df.to_html()

st.write(html, unsafe_allow_html=True)

Full code:

import tabulate as tb
import streamlit as st
import pandas as pd
import numpy as np

np.random.seed(42)

data = {
    'A': np.random.rand(5),
    'B': np.random.randint(1, 100, size=5),
    'C': np.random.choice(['X', 'Y', 'Z'], size=5)
}

df = pd.DataFrame(data)

def highlight_max(x, props):
    return np.where(x == np.nanmax(x.to_numpy()), props, None)
def highlight_min(x, props):
    return np.where(x == np.nanmin(x.to_numpy()), props, None)

df = df.style \
        .apply(highlight_max, props='background-color: #fed', subset=['A','B'], axis=0) \
        .apply(highlight_min, props='background-color: #afa', subset=['A','B'], axis=0)

html = df.to_html()

st.write(html, unsafe_allow_html=True)

table = tb.tabulate(data, tablefmt='html', headers=df.columns, showindex=True)
st.write('<style>table th {font-size: 30px; color: red} table tr:nth-child(odd) td {background-color: #eee}</style>', unsafe_allow_html=True)
st.markdown(table, unsafe_allow_html=True)

You need to use double curly-braces in oder to avoid string format interpolation.

For instance:

  <style type="text/css">
     .tg  {{border-collapse:collapse;border-spacing:0;}}
     .tg td{{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;}}
     .tg th{{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:black;}}
     .tg .tg-0lax{{text-align:left;vertical-align:top}} 
  </style>

Yes. First you have to change the number of fields you want to substitute as tables:

Copytext = """ [...] {table1} {table2} [...] """

Then you have to pass the content to format as kwargs:

Copytext = text.format(table1=tabulate(data, headers="firstrow", tablefmt="grid"),
                   table2=your_new_table_tabulation)

Same you can do for html

String formatting in Python is no sort of attachment, but rather a substitution of content into a pre-formatted field. You can substitute as many fields as you'd like, putting the names you'd like, and with the content you'd like. Then, when you send the email, you will send a normal HTML file with the tables rendered into as HTML/text

I encourage you to check out: https://docs.python.org/3/library/string.html#string.Formatter.format

That is for Python's version 3.7. You have almost every Python's version available online.