Summary  
This chapter covers selecting and manipulating paragraph elements in the DOM, including updating their text content and styling programmatically.

General domain of usage  
Web development (client-side)

import unittest
import io
import sys


def _dynamic_test(test_case, condition, success, fail):
    if condition:
        test_case._testMethodName = success
        test_case.assertTrue(True)
    else:
        test_case._testMethodName = fail
        test_case.fail(fail)


class TestUserCode(unittest.TestCase):

    # -------- 1. Check import --------
    def test_beautifulsoup_imported(self):
        with open("user_code.py", "r") as f:
            src = f.read()

        condition = "from bs4 import BeautifulSoup" in src

        _dynamic_test(
            self,
            condition,
            "The `BeautifulSoup` class is imported.",
            "Expected `from bs4 import BeautifulSoup` import."
        )

    # -------- 2. soup exists --------
    def test_soup_declared(self):
        import user_code

        condition = hasattr(user_code, "soup")

        _dynamic_test(
            self,
            condition,
            "`soup` variable is declared.",
            "`soup` variable is missing."
        )

    # -------- 3. soup is BeautifulSoup --------
    def test_soup_is_beautifulsoup(self):
        import user_code
        from bs4 import BeautifulSoup

        try:
            s = user_code.soup
            condition = isinstance(s, BeautifulSoup)
            fail_msg = "`soup` must be a BeautifulSoup instance."
        except:
            condition = False
            fail_msg = "`soup` is missing or invalid."

        _dynamic_test(
            self,
            condition,
            "`soup` is a valid BeautifulSoup object.",
            fail_msg
        )

    # -------- 4. html is decoded string --------
    def test_html_is_string(self):
        import user_code

        try:
            h = user_code.html
            condition = isinstance(h, str)
            fail_msg = f"`html` must be str, got `{type(h).__name__}`."
        except:
            condition = False
            fail_msg = "`html` variable missing."

        _dynamic_test(
            self,
            condition,
            "`html` contains decoded HTML.",
            fail_msg
        )

    # -------- 5. p is correct list of <p> elements --------
    def test_p_is_correct(self):
        import user_code

        try:
            p_val = user_code.p
            is_list = isinstance(p_val, list)
        except:
            is_list = False

        _dynamic_test(
            self,
            is_list,
            "`p` is a list of `<p>` elements.",
            "`p` must be a list returned by `soup.find_all('p')`."
        )

    # -------- 6. printed output matches p and len(p) --------
    def test_printed_output(self):
        import user_code
        import importlib

        # Capture stdout
        captured = io.StringIO()
        sys.stdout = captured

        importlib.reload(user_code)

        sys.stdout = sys.__stdout__

        output = captured.getvalue().splitlines()

        if len(output) < 2:
            _dynamic_test(
                self,
                False,
                "",
                "Expected two printed lines: list of `<p>` elements and its length."
            )
            return

        printed_list = output[0].strip()
        printed_len = output[1].strip()

        # Expected values
        expected_list = str(user_code.p)
        expected_len = str(len(user_code.p))

        cond_list = printed_list == expected_list
        cond_len = printed_len == expected_len

        if not cond_list:
            _dynamic_test(
                self,
                False,
                "",
                f"Expected printed list `{expected_list}`, got `{printed_list}`."
            )
            return

        if not cond_len:
            _dynamic_test(
                self,
                False,
                "",
                f"Expected printed length `{expected_len}`, got `{printed_len}`."
            )
            return

        _dynamic_test(
            self,
            True,
            "The list of `<p>` elements and its length are printed correctly.",
            ""
        )


if __name__ == "__main__":
    unittest.main()


test_code.py

Lär dig att automatiskt extrahera värdefull data från webbplatser. Behärska tekniker för att samla in information effektivt, vilket möjliggör djupgående analys, datadrivna beslut och nya insikter från det stora utbudet av onlineinformation.

Utforska strukturen hos en HTML-fil, lär dig hur du laddar den effektivt och få praktiska färdigheter i att arbeta med dess data.

Utforska grunderna i Beautiful Soup för att extrahera data från HTML-dokument. Lär dig att navigera i HTML-strukturen, komma åt specifika element och arbeta med deras underordnade element för att bygga en stark grund inom web scraping.

Behärska arbetet med elementattribut och innehåll med Beautiful Soup. Få färdigheter för att extrahera specifik information, söka efter element med attributvärden och använda avancerade tekniker för att effektivt tolka och analysera HTML-data.

Arbete med Paragrafelement

Lösning