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13.18. Write Code Exercises

1. Complete the following code that retrieves the file ‘romeo.txt’ from. Make changes to line 4 and 5.

   import socket mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) mysock.connect(('____', __)) cmd = '____ ________________________ HTTP/1.0\r\n\r\n'.encode() mysock.send(cmd) while True: data = mysock.recv(512) if len(data) < 1: break print(data.decode(),end='') mysock.close()

   Complete the following code that retrieves the file ‘romeo.txt’ from. Make changes to line 4 and 5.

   import socket mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) mysock.connect(('data.pr4e.org', 80)) cmd = 'GET http://data.pr4e.org/romeo.txt HTTP/1.0\r\n\r\n'.encode() mysock.send(cmd) while True: data = mysock.recv(512) if len(data) < 1: break print(data.decode(),end='') mysock.close()

Complete the following code to extract an image ‘cover3.jpg’ from the URL ‘http://data.pr4e.org/cover3.jpg’ and host ‘data.pr4e.org’. There are 5 empty spaces.

import socket HOST = '________' PORT = 80 mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) mysock.connect((____, ____)) mysock.sendall(b'___ __________________ HTTP/1.0\r\n\r\n') count = 0 picture = b"" while True: data = mysock.recv(5120) if len(data) < 1: break #time.sleep(0.25) count = count + len(data) print(len(data), count) picture = picture + data mysock.close() pos = picture.find(b"\r\n\r\n") picture = picture[pos+4:] fhand = open("stuff.jpg", "wb") fhand.write(picture) fhand.close()

Complete the following code that retrieves the text from ‘http://data.pr4e.org/clown.txt’, prints it and also prints the frequency of each word.

import urllib.request fhand = urllib.request.urlopen('_________________')

Complete the following code that retrieves the text from ‘http://data.pr4e.org/clown.txt’ and prints the frequency of each word.

import urllib.request fhand = urllib.request.urlopen('http://data.pr4e.org/clown.txt') for line in fhand: words = line.decode().strip() print(words) for word in words: counts[word] = counts.get(word, 0) + 1 print(counts)

Write a program to retrieve and print text from ‘http://data.pr4e.org/intro-short.txt” and print it.

import urllib.request

Write a program to store image file from ‘http://data.pr4e.org/cover.jpg’ to your disk.

import urllib.request, urllib.parse, urllib.error

Write a program to store image file from ‘http://data.pr4e.org/cover.jpg’ to your disk.

import urllib.request, urllib.parse, urllib.error img = urllib.request.urlopen('http://data.pr4e.org/cover.jpg').read() fhand = open('cover.jpg', 'wb') fhand.write(img) fhand.close()

Complete the following program to extract all url from the webpage using regex.

import urllib.request, urllib.parse, urllib.error import re url = "https://www.nytimes.com" html = _______________________ links = _______(b'href="(http[s]?://.*?)"', html)

Write a program that retrives a txt file from ‘https://www.gutenberg.org/files/1342/1342-0.txt’ in several blocks of 100,000 characters, joins them and saves as ‘prideandprejudice.txt’ to disk and prints number of characters.

import urllib.request, urllib.parse, urllib.error txt = urllib.request.urlopen('___________________') size = 0 while True: info = txt.read(100000) if len(info) < 1: break size = size + len(info)

Write a program that retrives a txt file from ‘https://www.gutenberg.org/files/1342/1342-0.txt’ in several blocks of 100,000 characters, joins them and saves as ‘prideandprejudice.txt’ to disk and prints number of characters.

import urllib.request, urllib.parse, urllib.error txt = urllib.request.urlopen('https://www.gutenberg.org/files/1342/1342-0.txt') fhand = open('prideandprejudice.txt', 'wb') size = 0 while True: info = txt.read(100000) if len(info) < 1: break size = size + len(info) fhand.write(info) print(size, 'characters copied.') fhand.close()

Write a program that retrives a txt file from ‘https://www.gutenberg.org/files/16/16-0.txt’ in several blocks of 100,000 characters, joins them and saves as ‘peterpan.txt’ to disk and prints number of characters.

import urllib.request, urllib.parse, urllib.error

Complete the following code to print all the image sources from the webpage. Use ‘img’ and ‘src’ as tags.

import requests from bs4 import BeautifulSoup url = "https://www.nytimes.com/" resp = requests.get(url) soup = BeautifulSoup(resp.content, 'html.parser')

Complete the following code to print all the image sources from the webpage. Use ‘img’ and ‘src’ as tags.

import requests from bs4 import BeautifulSoup url = "https://www.nytimes.com/" resp = requests.get(url) soup = BeautifulSoup(resp.content, 'html.parser') tags = soup('img') for tag in tags: print(tag.get('src', None))

Write code that extracts data from several parts of the ‘a’ tag from “http://www.dr-chuck.com/page1.htm” using BeautifulSoup and html.parser and print the tag, href, contents as well as all the attributes.

import requests from bs4 import BeautifulSoup

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