Python Sample Final Exam Review PDF

Web Mining and Social Network analysis Final Exam Review – Sample Exam Python A. True or False 1. In Python, math expressions are always evaluated from left to right, no matter what the operators are. ANS: False 2. A good...

Web Mining and Social Network analysis Final Exam Review – Sample Exam Python A. True or False 1. In Python, math expressions are always evaluated from left to right, no matter what the operators are. ANS: False 2. A good way to repeatedly perform an operation is to write the statements for the task once and then place the statements in a loop that will repeat as many times as necessary. ANS: True 3. Python allows you to pass multiple arguments to a function. ANS: True 4. The following code will display 'yes + no': mystr = 'yes' yourstr = 'no' mystr = mystr + yourstr print(mystr) ANS: False 5. The following code is correct if clause to determine whether choice is anything other than 10? if choice != 10: ANS: True B. Multiple Choice 6. The __________ function reads a piece of data that has been entered at the keyboard and returns that piece of data, as a string, back to the program. a. input() b. output() c. eval_input() d. str_input() ANS: A 1 7. What is the output of the following command, given that value1 = 2.0 and value2 = 12? print(value1 * value2) a. 24 b. value1 * value2 c. 24.0 d. 2.0 * 12 ANS: C 8. In Python, a comma-separated sequence of data items that are enclosed in a set of square brackets is called a. sequence b. variable c. value d. list ANS: D 9. What will be displayed after the following code is executed? total = 0 for count in [1,2,3]: total = total + count print(total) a. 1 3 6 b. 5 c. 1 4 d. 6 ANS: D 10. What will be the output after the following code is executed? def pass_it(x, y): z = str(x) + ", " + str(y) num1 = 4 num2 = 8 answer = pass_it(num1, num2) print(answer) a. 4, 8 b. 8, 4 2 c. 48 d. None ANS: D 11. What are the valid index values for extracting 'New York'from the following string? city = 'New York city' a. city[0:8] b. city[:8] c. city[0:-5] d. All of the above. ANS: D 12. What is the number of the first index in a dictionary? a. 0 b. 1 c. the size of the dictionary minus one d. Dictionaries are not indexed by number. ANS: D 13. What is the value of the variable phones after the following code executes? phones = {'John' : '5555555', 'Julie' : '5557777'} phones['John'] = '5556666' a. {'John' : '5555555', 'Julie' : '5557777'} b. {'John' : '5556666', 'Julie' : '5557777'} c. {'John' : '5556666'} d. This code is invalid. ANS: B 3  Web Scraping html_code = """ Food My Favorite Food Items This page lists all tasty food items. Cauliflower Fritters Deep fried cauliflower with a glaze of soy sauce Chickpea Curry Boiled chickpeas cooked in a tangy and spicy tomato sauce """ import pandas as pd from bs4 import BeautifulSoup soup = BeautifulSoup(html_code,'html.parser') 1.Which one of the following codes extracts the tag from html_code? a. soup.h1 b. soup.body.h1 c. soup.find('h1') d. soup.find(id="top") e All of the above Answer: E 2.The following tag extracts the first tag with class equal to "food" and id equal to "top"? soup.find('h1', id="top", class="food" ) a. True b. False 4  Answer: False 3. Which one of the following codes extracts the value of the class attribute of all the tags in html_code? A. for p in soup.find("div").find_all("p"): print(p.attrs['class']) B. for p in soup.find_all("div").find_all("p"): print(p.attrs['class']) C. for p in soup.find("div").find("p"): print(p.attrs['class']) D. for p in soup.find_all("div").find("p"): print(p.attrs['class']) Answer: A 4. Which one of the following codes doesn't print the tag object of the tag that says, "Cauliflower Fritters"? A. soup.find_all("p") B. soup.find_all(class_="food", limit=1) C. soup.find(id="content").find("p") D. soup.div.p E. soup.find_all("p", string="Cauliflower Fritters") Option B 5. How many list items will be there in pTags? pTags = soup.body.find_all("p", recursive=False) print(len(pTags)) A. 4 B. 5 C. 0 D. 1 Option D 6. What is the output produced by the following statement? print(soup.find("h1", attrs ={"id":"top" ,"class":"sister"})) 5  A. [] B. None C. My Favorite Food Items D. [My Favorite Food Items] Option B **********Imagine that we wrote the following code to extract the data from html_code: import pandas as pd from bs4 import BeautifulSoup soup = BeautifulSoup(html_code,'html.parser') divTags = soup.find("div", id="content") # line 1 pfood = divTags.find_all("p", class_="food") # line 2 pdesc = divTags.find_all("p", class_="desc") # line 3 food_list = [] # line 4 desc_list=[] # # line 5 for p in pfood: # line 6 food = p.get_text().strip() # line 7 food_list.append(food) # line 8 for d in pdesc: # Line 9 desc = d.get_text().strip() # Line 10 desc_list.append(desc) # Line 11 data1 = {'food':food_list,'desc':desc_list} print(data1) df = pd.DataFrame(data1) print(df) 7. Let's say that we want to remove line 1. Still, we want the program to produce the same dataframe df. Replacing "divTags" with "soup" in lines 2 and 3 should work. A. True B. False Answer: True 8. Imagine that we wanted to handle errors in case a food description is not on the website. The following replacement for lines 9 to 11 works to produce the same dataframe df. 6  for d in pdesc: try: desc = d.get_text().strip() desc_list.append(desc) except: desc= "NA" desc_list.append(desc) A. True B. False Answer: True 9. If we added print(p) within the "for" loop at line 6, print(p)will display ______ in each iteration. (a) Contents (i.e., the actual data) (b) List Object (c) Tag Object (d) None of the above Option C 10. The following code extracts the first tag in markup1. markup1='Page 1Page 1' soup1 = BeautifulSoup(markup1,"html.parser") print(soup1.find_all(data-cap="error")) A. True B. False Answer: False 11. A data scientist started writing code to search the following books on amazon.com. data science finance web mining scraping Amazon’s URL follows the following pattern for searching. https://www.amazon.com/s?k=life+lessons https://www.amazon.com/s?k=management+information+systems https://www.amazon.com/s?k=business Given this pattern, the data scientist wrote the following "for" loop to create links? Does this work in creating a list of search URLs? Mark True if "Yes", else mark "False" 7  search_strings = ["data science","finance","web+mining+scraping"] search_strings_list=[] for search in search_strings: created_link = "https://www.amazon.com/s?k=" + search_string search_strings_list.append(created_link) print(created_link) A. True B. False Answer: False 12. A tag’s children are available in a list called A..descendants B..contents C..children D..nested_tags Answer: B 2. The following tag extracts the first tag with class equal to "food" and id equal to "top"?4 15. 8