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Questions and Answers

What will be the output of the following code? total = 0 for count in [1,2,3]: total = total + count print(total)

  • 6 (correct)
  • 5
  • 1
  • 1 4

Which of the following correctly describes a list in Python?

  • A comma-separated sequence of data items enclosed in square brackets. (correct)
  • A collection of items that prevents duplicates.
  • A variable holding a single value.
  • A sequence of items enclosed in curly braces.

What does the following code return? def pass_it(x, y): z = str(x) + ", " + str(y) answer = pass_it(4, 8) print(answer)

  • 48
  • None (correct)
  • 8, 4
  • 4, 8

What is the valid index for extracting 'New York' from the string: city = 'New York city'?

<p>All of the above (D)</p> Signup and view all the answers

In Python, what will the expression phones['John'] evaluate to after this code executes? phones = {'John' : '5555555', 'Julie' : '5557777'} phones['John'] = '5556666'

<p>'5556666' (B)</p> Signup and view all the answers

Which of the following statements about dictionaries is true?

<p>Dictionaries are not indexed by number. (D)</p> Signup and view all the answers

What is the correct way to read data from the keyboard in Python?

<p>input() (B)</p> Signup and view all the answers

What will happen if line 1 is removed, and 'divTags' is replaced with 'soup' in lines 2 and 3?

<p>The program will still produce the same dataframe df. (D)</p> Signup and view all the answers

What is the purpose of the 'try' and 'except' block in the error handling code?

<p>To append 'NA' if a description does not exist. (B)</p> Signup and view all the answers

What will the print statement inside the 'for' loop located at line 6 display?

<p>The tag objects for each food item. (D)</p> Signup and view all the answers

What is the outcome of the provided code snippet that extracts the first tag?

<p>It will not find any tag due to the wrong attribute name. (D)</p> Signup and view all the answers

Given the URL format for searching on Amazon, which aspect needs to change to create a search link for 'data science'?

<p>Only the keyword after '?k=' should change. (D)</p> Signup and view all the answers

How does the 'p.get_text().strip()' function assist in data cleaning?

<p>It removes unnecessary whitespace from the content. (A)</p> Signup and view all the answers

Why might a data scientist use a loop to create search URLs for Amazon?

<p>To generate a unique URL for each search term systematically. (B)</p> Signup and view all the answers

What will the variable 'data1' store after lines 4 to 11 are executed?

<p>A dictionary with food and descriptions as keys. (C)</p> Signup and view all the answers

Which code correctly extracts the value of the class attribute of all the

tags in the given html_code?

<p>for p in soup.find('div').find_all('p'): print(p.attrs['class']) (A)</p> Signup and view all the answers

What is the output of the code 'soup.find_all(class_="food", limit=1)' in relation to extracting

tags?

<p>It retrieves the first <p> tag with class equal to 'food'. (C)</p> Signup and view all the answers

Which statement is true about 'soup.find('h1', id="top", class="food")'?

<p>It retrieves the <h1> tag if id is 'top' and class is 'food'. (C)</p> Signup and view all the answers

How many

tags will 'soup.body.find_all("p", recursive=False)' return?

<p>1 (D)</p> Signup and view all the answers

What does the code 'soup.find_all("p", string="Cauliflower Fritters")' do?

<p>It retrieves <p> tags with 'Cauliflower Fritters' as their string content. (A)</p> Signup and view all the answers

Which code does not print the

tag object that contains 'Cauliflower Fritters'?

<p>soup.find_all(class_='food', limit=1) (C)</p> Signup and view all the answers

What is the expected output from 'print(soup.find("h1", attrs ={ "id":"top" ,"class":"sister" }))'?

<p>None (A)</p> Signup and view all the answers

Which of these statements describes the structure of the HTML provided?

<p>The HTML includes <h1>, <p>, and <div> tags collectively. (A)</p> Signup and view all the answers

Flashcards

Python Math Expressions

In Python, math expressions are evaluated following the order of operations (PEMDAS/BODMAS), not strictly from left to right.

Loop for Repetition

A loop in Python allows you to execute a block of code multiple times, efficiently repeating a task.

Function Arguments

Functions in Python can accept multiple arguments, allowing flexibility and code reusability.

String Concatenation

Joining two strings together using the '+' operator in Python.

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'if' Clause for Comparison

The 'if' clause in Python lets you execute code only if a certain condition is true, allowing conditional logic.

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Input Function in Python

The 'input()' function reads text typed by the user from the keyboard and returns it as a string.

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List in Python

A list in Python is a collection of items enclosed in square brackets, where each item can be of different datatypes and accessed by index.

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Dictionary in Python

A dictionary in Python is a data structure that stores key-value pairs, allowing you to retrieve information based on specific keys.

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BeautifulSoup for HTML Parsing

BeautifulSoup is a Python library used to extract data from HTML and XML content. It makes it easy to navigate and manipulate HTML structures.

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.find_all() for Multiple Matches

The find_all() method in BeautifulSoup finds all elements that match a given criteria, returning a list of matching tags.

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.get_text() for Text Content

The .get_text() method extracts the text content of an HTML tag, removing any HTML tags and whitespace.

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Error Handling with try-except

The try-except block allows you to handle potential errors in your code, gracefully handling unexpected situations.

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Appending Data to Lists

The .append() method adds an item to the end of a list, growing the list's size.

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Pandas DataFrame

A Pandas DataFrame is a powerful data structure in Python, representing data as rows and columns, similar to a spreadsheet.

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.strip() for Clean Text

The .strip() method removes leading and trailing whitespace from a string, producing clean text.

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URLs with Search Keywords

Websites like Amazon use URLs that include search keywords to filter their results. The pattern often includes the search term within the URL using a key like 'k='.

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Soup.h1

This code extracts the first 'h1' tag from the html_code using BeautifulSoup.

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Soup.find('h1')

This code finds all 'h1' tags within the HTML code using BeautifulSoup.

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Soup.find_all('h1')

This code finds all 'h1' tags within the HTML code using BeautifulSoup.

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Soup.find(id='top')

This code finds the first tag with the attribute 'id' set to 'top' using BeautifulSoup.

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Soup.find('h1', id='top', class='food')

This code searches for the first 'h1' tag with both 'id' set to 'top' and 'class' set to 'food'.

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Soup.find_all('div').find_all('p')

This code finds all 'p' tags within all 'div' tags using BeautifulSoup.

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Soup.find('div').find('p')

This code finds the first 'p' tag within the first 'div' tag using BeautifulSoup.

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Soup.body.find_all('p', recursive=False)

This code finds all 'p' tags directly within the 'body' tag, not including any nested 'p' tags.

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Study Notes

True or False Questions

  • Math expressions in Python are not always evaluated from left to right. They follow operator precedence rules.
  • Repeating operations in Python use loops.
  • Python supports multiple arguments.
  • Code snippet displaying "yes + no" is incorrect.
  • Code checking if choice is not 10 is correct.

Multiple Choice Questions

  • The input() function gets input from the keyboard.
  • input() returns a string.
  • Output of print(valuel * value2) is 24.0 , given valuel = 2.0 and value2 = 12.
  • A comma-separated sequence of data items enclosed in square brackets is a list.
  • Output of total = 0; for count in [1, 2, 3]: total = total + count; print(total) is 6.
  • Output of def pass_it(x, y): z = str(x) + ", " + str(y); num1 = 4; num2 = 8; answer = pass_it(num1, num2); print(answer) is "4, 8".
  • Valid index values for extracting 'New York' from 'New York city' include 0:8, :8, and 0:-5.
  • Dictionaries are not indexed by number.
  • Output of phones = {'John':'5555555','Julie':'5557777'}; phones['John']='5556666'; print(phones) is {'John':'5556666','Julie':'5557777'}.

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