CKMod7L5

#Conner Kahn #11/15 #I learned more about file control

# ************** DO NOT MODIFY OR ADD ANYTHING TO THIS CODE SEGMENT *********** # ************** Click Edit> Clear All Outputs *********** # ************** This code segment must be run before attempting any of the tasks or examples in this lesson ******************** # ************** This cell is a reset cell to remove (if they exist) the parent_dir and any children or leaves # It prepares the directories and files necessary to run the examples and complete the tasks. # This cell can be run first then all others cells in this notebook can be run, then this cell can be rerun # This is the reset. It uses the import shutil (or shell utility) which you will learn later in the course import os, shutil # shutil = shell utility has an important method called rmtree() # linux does not have an equivalent command! # Navigate to `library` directory (if not already in it) current_path = os.getcwd() print(current_path) if ("content" in current_path): nb_path = current_path.split("content")[0] # nb_path = the 1st item in the split list else: nb_path = current_path print("Changing working dir to directory above parent_dir") os.chdir(os.path.join(nb_path)) current_path = os.getcwd() print("Current working directory:", current_path) if (os.path.exists('parent_dir') == True): shutil.rmtree('parent_dir') os.mkdir('parent_dir') os.chdir('parent_dir') os.mkdir('child1_dir') os.chdir('../') current_path = os.getcwd() print("Current working directory:", current_path) #JG import os # Create a file to be deleted file_path = "parent_dir/tmp_file_to_be_deleted.txt" f = open(file_path, 'w') f.close() # list the content of parent_dir print('Content of "parent_dir" after creating the file:') print(os.listdir("parent_dir")) print() # delete the file os.remove(file_path) # list the content of parent_dir print('Content of "parent_dir" after removing the file') print(os.listdir("parent_dir"))

/work
Changing working dir to directory above parent_dir
Current working directory: /work
Current working directory: /work
Content of "parent_dir" after creating the file:
['child1_dir', 'tmp_file_to_be_deleted.txt']

Content of "parent_dir" after removing the file
['child1_dir']

# ************** DO NOT MODIFY OR ADD ANYTHING TO THIS CODE SEGMENT *********** # ************** This code segment must be run before attempting any of the tasks in this lesson ******************** # It prepares the directories and files necessary to complete the tasks. import os, random, shutil # Navigate to `parent_dir` directory (if not already in it) current_path = os.getcwd() if ("parent_dir" in current_path): nb_path = current_path.split("parent_dir")[0] else: nb_path = current_path print("Changing working dir to parent_dir") os.chdir(os.path.join(nb_path,'parent_dir')) print("Current working directory:", os.getcwd()) # Remove the `files_exercises` directory (if it exists) if('files_exercises' in os.listdir()): print('Removing "files_exercises"') shutil.rmtree('files_exercises') # Create a new directory called `files_exercises` print('Making "files_exercises"') os.mkdir('files_exercises') # Change the working directory to `files_exercises` print('Changing working directory to "files_exercises"') os.chdir('files_exercises') # Display the current working directory to verify you are in the correct location print("Current working directory:", os.getcwd()) # Create 100 text files, the first line of each file is a random number in the range [1000, 9999] print("Creating 100 text files") random.seed(25000) # to get the same random numbers every time the setup runs for i in range(100): file_name = str(i) + ".txt" f = open(file_name, 'w') f.write(str(random.randint(1000, 9999))) f.close() f = open('text_file.txt', 'w') f.write("JG") f.close() # Create 5 directories print("Creating 5 directories") for i in range(1, 6): os.mkdir("dir_"+str(i)) print("Environment setup completed!")

Changing working dir to parent_dir
Current working directory: /work/parent_dir
Making "files_exercises"
Changing working directory to "files_exercises"
Current working directory: /work/parent_dir/files_exercises
Creating 100 text files
Creating 5 directories
Environment setup completed!

# [ ] Complete the following program to delete the first 10 files inside `files_exercises` (0.txt, 1.txt ... 9.txt) # Make sure the to run the environment setup code before running your own program. import os if ('files_exercises' not in os.getcwd()): print("STOP!!!! Run the environment setup code!") # list the content of `files_exercises` print('Content of "files_exercises" before removing the files') print(os.listdir()) #TODO: delete the first 10 files for x in range(10): os.remove(str(x) + '.txt') # list the content of `files_exercises` print('Content of "files_exercises" after removing the files') print(os.listdir())

Content of "files_exercises" before removing the files
['27.txt', '20.txt', 'dir_3', '52.txt', '83.txt', '55.txt', '29.txt', '60.txt', '0.txt', '67.txt', '15.txt', '69.txt', '12.txt', '9.txt', '78.txt', '76.txt', '71.txt', '95.txt', '44.txt', '38.txt', 'text_file.txt', 'dir_4', '92.txt', '43.txt', '31.txt', '36.txt', '13.txt', '8.txt', '14.txt', '68.txt', '1.txt', '66.txt', '61.txt', '6.txt', '54.txt', '85.txt', '28.txt', '53.txt', '82.txt', '21.txt', '26.txt', '37.txt', '30.txt', '93.txt', '42.txt', '94.txt', '45.txt', '39.txt', '70.txt', '77.txt', '79.txt', '33.txt', '99.txt', '48.txt', 'dir_5', '34.txt', '97.txt', '46.txt', '90.txt', '41.txt', '74.txt', '73.txt', '17.txt', '10.txt', '62.txt', '19.txt', '2.txt', '65.txt', '50.txt', '81.txt', '57.txt', '86.txt', '59.txt', '88.txt', '25.txt', 'dir_2', '22.txt', '72.txt', '75.txt', '91.txt', '40.txt', '96.txt', '47.txt', '98.txt', '49.txt', '35.txt', '32.txt', '23.txt', '58.txt', '89.txt', '24.txt', '56.txt', '87.txt', '51.txt', '80.txt', '18.txt', '3.txt', '64.txt', '63.txt', '4.txt', '11.txt', '16.txt', 'dir_1']

Execution Error

FileNotFoundError: [Errno 2] No such file or directory: '5.txt'

import os.path print("Current working directory:", os.getcwd()) #file_path = "parent_dir/fictitious_file.txt" file_path = "/content/parent_dir/fictitious_file.txt" # Removing a file # Check if the path exists if (os.path.exists(file_path)): if (os.path.isfile(file_path)): os.remove(file_path) else: print("Cannot remove a directory") else: print("path does not exist")

Current working directory: /work/parent_dir/files_exercises
path does not exist

import os.path file_path = "parent_dir" print("Current working directory:", os.getcwd()) #file_path = "parent_dir/fictitious_file.txt" file_path = "/content/parent_dir" # Removing a file # Check if the path exists if (os.path.exists(file_path)): if (os.path.isfile(file_path)): os.remove(file_path) else: print("Cannot remove a directory") else: print("path does not exist")

Current working directory: /work/parent_dir/files_exercises
path does not exist

# [ ] Write a program to delete all the even numbered files inside `files_exercises` # Make sure the to run the environment setup code before running your own program. import os if ('files_exercises' not in os.getcwd()): print("STOP!!!! Run the environment setup code!") print(os.listdir()) #TODO: Your code goes here for x in range(100): if x % 2 == 1: if os.path.exists(str(x) + '.txt'): os.remove(str(x) + ".txt") print(os.listdir())

['65.txt', '19.txt', '62.txt', '10.txt', '17.txt', '22.txt', '25.txt', '59.txt', '88.txt', '57.txt', '86.txt', '50.txt', '81.txt', '90.txt', '41.txt', '8.txt', '97.txt', '46.txt', '34.txt', '6.txt', '99.txt', '48.txt', '33.txt', '1.txt', 'text_file.txt', '73.txt', '74.txt', '51.txt', '80.txt', '56.txt', '87.txt', '24.txt', '58.txt', '89.txt', '23.txt', 'dir_4', '16.txt', '11.txt', '63.txt', '64.txt', '18.txt', '75.txt', '72.txt', 'dir_3', '32.txt', '0.txt', '35.txt', '7.txt', '98.txt', '49.txt', '9.txt', '96.txt', '47.txt', '91.txt', '40.txt', '71.txt', '76.txt', '78.txt', '36.txt', '4.txt', '31.txt', '3.txt', '92.txt', '43.txt', 'dir_1', '38.txt', '95.txt', '44.txt', '29.txt', '55.txt', '84.txt', '52.txt', '83.txt', '20.txt', '27.txt', '12.txt', '69.txt', '15.txt', '67.txt', '60.txt', '39.txt', '94.txt', '45.txt', '93.txt', '42.txt', '30.txt', '2.txt', '37.txt', '5.txt', '79.txt', '77.txt', 'dir_2', '70.txt', 'dir_5', '61.txt', '66.txt', '68.txt', '14.txt', '13.txt', '26.txt', '21.txt', '53.txt', '82.txt', '28.txt', '54.txt', '85.txt']
['62.txt', '10.txt', '22.txt', '88.txt', '86.txt', '50.txt', '90.txt', '8.txt', '46.txt', '34.txt', '6.txt', '48.txt', 'text_file.txt', '74.txt', '80.txt', '56.txt', '24.txt', '58.txt', 'dir_4', '16.txt', '64.txt', '18.txt', '72.txt', 'dir_3', '32.txt', '0.txt', '98.txt', '96.txt', '40.txt', '76.txt', '78.txt', '36.txt', '4.txt', '92.txt', 'dir_1', '38.txt', '44.txt', '84.txt', '52.txt', '20.txt', '12.txt', '60.txt', '94.txt', '42.txt', '30.txt', '2.txt', 'dir_2', '70.txt', 'dir_5', '66.txt', '68.txt', '14.txt', '26.txt', '82.txt', '28.txt', '54.txt']

# [ ] Write a program to delete all the directories inside `files_exercises` # Make sure the to run the environment setup code before running your own program. import os if ('files_exercises' not in os.getcwd()): print("STOP!!!! Run the environment setup code!") #TODO: Your code goes here for x in range(1,5): os.rmdir("dir_"+ str(x))

# [ ] Write a program to ask the user for a file number, # then delete the file if it exists or display an appropriate error message if it does not. # Make sure the to run the environment setup code before running your own program. # Test your program with the following: # case 1: user inputs 84, 84.txt should be deleted # case 2: user inputs 84 (again), a File does not exist message is printed # case 3: user inputs 5, 5.txt should be deleted import os if ('files_exercises' not in os.getcwd()): print("STOP!!!! Run the environment setup code!") #TODO: Your code goes here x = input("input a numer") if os.path.exists(str(x) + '.txt'): os.remove(str(x) + '.txt') print('file #', x, "has been deleted") else: print("sorry this file does not exist") print(os.listdir())

sorry this file does not exist
['11.txt', '16.txt', '18.txt', '64.txt', '63.txt', '87.txt', '1.txt', '56.txt', '6.txt', '80.txt', '51.txt', '23.txt', '8.txt', '89.txt', '58.txt', '24.txt', '49.txt', '98.txt', '35.txt', '32.txt', '40.txt', '91.txt', '47.txt', '96.txt', '72.txt', '75.txt', '88.txt', '59.txt', '25.txt', '22.txt', '9.txt', '7.txt', '81.txt', '50.txt', '86.txt', '0.txt', '57.txt', '62.txt', '19.txt', '65.txt', '17.txt', '10.txt', '74.txt', '73.txt', '46.txt', '97.txt', '41.txt', '90.txt', '33.txt', '48.txt', '99.txt', '34.txt', 'text_file.txt', '79.txt', '70.txt', '77.txt', '42.txt', '93.txt', '45.txt', '94.txt', '39.txt', '37.txt', '30.txt', '21.txt', '26.txt', '3.txt', '85.txt', '54.txt', '28.txt', '82.txt', '4.txt', '53.txt', '66.txt', '61.txt', '13.txt', '14.txt', '68.txt', '31.txt', '36.txt', '44.txt', '95.txt', '38.txt', '43.txt', '92.txt', '76.txt', '71.txt', '78.txt', 'dir_5', '15.txt', '69.txt', '12.txt', '60.txt', '67.txt', '83.txt', '52.txt', '2.txt', '55.txt', '29.txt', '27.txt', '20.txt']

import os.path file_path = "/content/parent_dir/fictitious_file.txt" # Remove a file try: os.remove(file_path) except FileNotFoundError as exception_object: print("Cannot find file: ", exception_object) except PermissionError as exception_object: print("Cannot delete a directory: ", exception_object) except Exception as exception_object: print("Unexpected exception: ", exception_object)

Cannot find file:  [Errno 2] No such file or directory: '/content/parent_dir/fictitious_file.txt'

import os.path file_path = "/content/parent_dir" # Remove a file try: os.remove(file_path) except FileNotFoundError as exception_object: print("Cannot find file: ", exception_object) except PermissionError as exception_object: print("Cannot delete a directory: ", exception_object) except Exception as exception_object: print("Unexpected exception: ", exception_object)

Cannot find file:  [Errno 2] No such file or directory: '/content/parent_dir'

# [ ] Write a program to ask the user for a file number, # then delete the file if it exists or display an appropriate error message if it does not. # Use file exception handling instead of file existence tests. # Make sure to run the environment setup code before running your own program. # Test your program with the following: # Case 1: When the user inputs 84, the program should delete the file 84.txt # Case 2: When the user inputs 84 (again), the program should print a File Not Found error message # Case 3: When the user inputs 5, the program should delete the file 5.txt import os if ('files_exercises' not in os.getcwd()): print("STOP!!!! Run the environment setup code!") #TODO: Your code goes here x = input("input a number of a file") try: os.remove(str(x)+'.txt') print("file #", x, 'has been deleted') except FileNotFoundError as exception_object: print("Cannot find file: ", exception_object) print(os.listdir())

Cannot find file:  [Errno 2] No such file or directory: '5.txt'
['27.txt', '20.txt', 'dir_3', '52.txt', '83.txt', '55.txt', '29.txt', '60.txt', '0.txt', '67.txt', '15.txt', '69.txt', '12.txt', '9.txt', '78.txt', '76.txt', '71.txt', '95.txt', '44.txt', '38.txt', 'text_file.txt', 'dir_4', '92.txt', '43.txt', '31.txt', '36.txt', '13.txt', '8.txt', '14.txt', '68.txt', '1.txt', '66.txt', '61.txt', '6.txt', '54.txt', '85.txt', '28.txt', '53.txt', '82.txt', '21.txt', '26.txt', '37.txt', '30.txt', '93.txt', '42.txt', '94.txt', '45.txt', '39.txt', '70.txt', '77.txt', '79.txt', '33.txt', '99.txt', '48.txt', 'dir_5', '34.txt', '97.txt', '46.txt', '90.txt', '41.txt', '74.txt', '73.txt', '17.txt', '10.txt', '62.txt', '19.txt', '2.txt', '65.txt', '50.txt', '81.txt', '57.txt', '86.txt', '59.txt', '88.txt', '25.txt', 'dir_2', '22.txt', '72.txt', '75.txt', '91.txt', '40.txt', '96.txt', '47.txt', '98.txt', '49.txt', '35.txt', '32.txt', '23.txt', '58.txt', '89.txt', '24.txt', '56.txt', '87.txt', '51.txt', '80.txt', '18.txt', '3.txt', '64.txt', '63.txt', '4.txt', '11.txt', '16.txt', 'dir_1']

file_path = "/content/parent_dir/files_exercises/text_file.txt" try: file = open(file_path, 'r') x = int(file.readline()) # Raise an exception if lines are not numeric file.close() # Might never be reached if file.write raised an error except Exception as exception_object: print("Unexpected exception:", exception_object) print("File is closed?", file.closed)

Unexpected exception: [Errno 2] No such file or directory: '/content/parent_dir/files_exercises/text_file.txt'

Execution Error

NameError: name 'file' is not defined

file_path = "/content/parent_dir/files_exercises/text_file.txt" try: file = open(file_path, 'r') x = int(file.readline()) #raise an exception if lines are not numeric except Exception as exception_object: print("Unexpected exception:", exception_object) finally: file.close() # will be executed whether an exception was raised or not print("File is closed?", file.closed)

Unexpected exception: [Errno 2] No such file or directory: '/content/parent_dir/files_exercises/text_file.txt'

Execution Error

NameError: name 'file' is not defined

file_path = "/content/parent_dir/files_exercises/text_file.txt" try: with open(file_path, 'r') as fwile: x = int(file.readline()) #raise an exception if lines are not numeric except Exception as exception_object: print("Unexpected exception", exception_object) print("File is closed?", fwile.closed)

Unexpected exception [Errno 2] No such file or directory: '/content/parent_dir/files_exercises/text_file.txt'

Execution Error

NameError: name 'fwile' is not defined

# [ ] Write a program to print the first line of every file inside `files_exercises` # Use a `with` statement to open (and close) every file # Make sure the to run the environment setup code before running your own program. file_path = "/content/parent_dir/files_exercises" import os, os.path if ('files_exercises' not in os.getcwd()): print("STOP!!!! Run the environment setup code!") #TODO: Your code goes here for x in os.listdir('/work/parent_dir/files_exercises'): if os.path.isfile(x): z = open(x, 'r') print(z.readline()) z.close()