Download URL, select table and have interactive IPython shell with defined DataFrame

dfget.py

#!/usr/bin/env python
# dfget gets URL and interprets interactively selected table as Pandas DataFrame

import inquirer
import requests
import sys
import IPython

import pandas as pd

from bs4 import BeautifulSoup


MAX_ROWS_PREVIEW = 5


def bail(msg=None, code=1):
    if msg is not None:
        print(msg)
    sys.exit(code)


def print_usage():
    print("Usage: dfget URL")


if len(sys.argv) <= 1:
    print('Not enough parameters')
    print_usage()
    bail()
url = sys.argv[1]

# Download HTML from given URL using a common user agent
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36',
}
r = requests.get(url, headers=headers)
status_code = r.status_code
status_text = requests.status_codes._codes[status_code][0].replace('_', ' ').upper()
if status_code != 200:
    bail(f'{status_code} {status_text}: Error downloading {url}')

# If multiple tables available, select interactively
soup = BeautifulSoup(r.text, features="lxml")
tables = soup.select('table')

# Terse preview for easier selection
max_rows = pd.get_option('display.max_rows')
pd.set_option('display.max_rows', MAX_ROWS_PREVIEW)

if len(tables) == 1:
    table_id = 0
else:
    with pd.option_context('display.colheader_justify','left'):
        choices = [
            str(pd.read_html(str(table[1].encode()))) + '\n'
            for table in enumerate(tables)
        ]
        choices = [
            choice.replace('\n', '\n    ')
            for choice in choices
        ]
        questions = [
            inquirer.List('table', message="What table do you want to select?", choices=choices),
        ]
        table_id = choices.index(inquirer.prompt(questions)['table'])

pd.set_option('display.max_rows', max_rows)
table = tables[table_id]
df = pd.read_html(table.encode())[0]

# Start interactive session
IPython.start_ipython(user_ns={'df': df.copy()}, argv=[])