# Charles Edgar # November 4, 2021 # In this lesson I learned how to read a file as a list with .readlines() and how to close a file. # In this lesson I did not have trouble understanding the material. My biggest struggle was simply # remembernig what files I had opened, how I had changed the files, when I would have to re-open # the files, etc. That problem only required scrolling up and reading back what I had done to figure # out what I would need to do to get where I wanted to be.

# [ ] Run to download file to notebook !curl https://raw.githubusercontent.com/MicrosoftLearning/intropython/master/poem1.txt -o poem1.txt

# [ ] review and run example # open address to file poem1 = open('poem1.txt', 'r') # readlines and print as a list poem_lines = poem1.readlines() poem_lines

# [ ] review and run example # Print each item in the list for line in poem_lines: print(line)

# [ ] import cities !curl https://raw.githubusercontent.com/MicrosoftLearning/intropython/master/cities -o cities.txt

# [ ] open cities.txt as cities_file and read the file as a list: cities_lines cities_file = open('cities.txt', 'r') cities_lines = cities_file.readlines()

# [ ] use list iteration to print each city in cities_lines list for city in cities_lines: print(city)

# [ ] review and run examples # [ ] re-open file and read file as a list of strings poem1 = open('poem1.txt', 'r') poem_lines = poem1.readlines() print(poem_lines)

# [ ] print each list item for line in poem_lines: print(line)

# [ ] remove the last character of each list item, which is "\n" count = 0 # Each line in the list becomes itself without the last character (\n) for line in poem_lines: poem_lines[count] = line[:-1] count += 1 print(poem_lines)

# [ ] print each list item for line in poem_lines: print(line)

# [ ] re-open file and read file as a list of strings # [ ] open cities.txt as cities_file and read the file as a list: cities_lines cities_file = open('cities.txt','r') cities_lines = cities_file.readlines() print(cities_lines)

# [ ] remove the last character, "\n", of each cities_lines list item count = 0 # Each line in the list becomes itself without the last character (\n) for line in cities_lines: cities_lines[count] = city[:-1] count += 1

# [ ] print each list item in cities_lines for line in cities_lines: print(line)

# [ ] review and run example: open and readlines of poem1.txt poem1 = open('poem1.txt', 'r')

# [ ] review and run example: readlines breaks if file is no longer open poem_lines = poem1.readlines() print(poem_lines)

# [ ] review and run example: Close poem1 poem1.close()

# [ ] open cities.txt as cities_file cities_file = open('cities.txt','r')

# [ ] read the lines as cities_lines cities_lines = cities_file.readlines()

# [ ] print the cities that start with the letter "D" or greater for line in cities_lines: if line.lower().startswith('a'): print(line) elif line.lower().startswith('b'): print(line) elif line.lower().startswith('c'): print(line) elif line.lower().startswith('d'): print(line)

# [ ] test that file is closed cities_lines =cities_file.readlines() print(cities_lines)

# [ ] close cities_file cities_file.close()

# [ ] import https://raw.githubusercontent.com/MicrosoftLearning/intropython/master/poem2.txt as poem2.txt !curl https://raw.githubusercontent.com/MicrosoftLearning/intropython/master/poem2.txt -o poem2.txt

# [ ] open poem2.txt as poem2_text in read mode poem2_text = open('poem2.txt','r')

# [ ] create a list of strings, called poem2_lines, from each line of poem2_text poem2_lines = poem2_text.readlines()

# [ ] remove the newline character for each list item in poem2_lines count = 0 for line in poem2_lines: poem2_lines[count] = line[:-1] count += 1 poem2_lines

# [ ] print the poem2 lines in reverse order poem2_lines.reverse() print(poem2_lines)