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	`1`	`+# backupToZip.py - Copies an entire folder and its contents into`
	`2`	`+# a ZIP file whose filename increments.`
	`3`	`+`
	`4`	`+import os`
	`5`	`+import zipfile`
	`6`	`+`
	`7`	`+`
	`8`	`+def backup_to_zip(folder):`
	`9`	`+ # Backup the entire contents of "folder" into a ZIP file.`
	`10`	`+ folder = os.path.abspath(folder)`
	`11`	`+`
	`12`	`+ # Figure out the filename this code should use based on`
	`13`	`+ # what files already exist.`
	`14`	`+ number = 1`
	`15`	`+ while True:`
	`16`	`+ zip_file_name = os.path.basename(folder) + "_" + str(number) + ".zip"`
	`17`	`+ if not os.path.exists(zip_file_name):`
	`18`	`+ break`
	`19`	`+ number += 1`
	`20`	`+`
	`21`	`+ # Create the ZIP file.`
	`22`	`+ print("Creating %s..." % zip_file_name)`
	`23`	`+ backup_zip = zipfile.ZipFile(zip_file_name, 'w')`
	`24`	`+`
	`25`	`+ # Walk the entire folder tree and compress the files in each folder.`
	`26`	`+ for foldername, subfolders, filenames in os.walk(folder):`
	`27`	`+ print("Adding files in %s..." % foldername)`
	`28`	`+ # Add the current folder to the ZIP file.`
	`29`	`+ backup_zip.write(foldername)`
	`30`	`+`
	`31`	`+ # Add all the files in this folder to the ZIP file.`
	`32`	`+ for filename in filenames:`
	`33`	`+ newBase = os.path.basename(folder) + '_'`
	`34`	`+ if filename.startswith(newBase) and filename.endswith('.zip'):`
	`35`	`+ continue`
	`36`	`+ backup_zip.write(os.path.join(foldername, filename))`
	`37`	`+ backup_zip.close()`
	`38`	`+ print('Done!')`
	`39`	`+`
	`40`	`+`
	`41`	`+backup_to_zip(".\\files\\C9_backup")`

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	`1`	`+"""`
	`2`	`+Program that walks through a folder tree and searches for exceptionally`
	`3`	`+large files or folders—say, ones that have a file size of more than`
	`4`	`+100MB.`
	`5`	`+`
	`6`	`+"""`
	`7`	`+`
	`8`	`+import os`
	`9`	`+`
	`10`	`+`
	`11`	`+def delete_files(folder):`
	`12`	`+ folder = os.path.abspath(folder)`
	`13`	`+`
	`14`	`+ for folder, subfolders, files in os.walk(folder):`
	`15`	`+ for filename in files:`
	`16`	`+ file_size = os.path.getsize(os.path.join(folder, filename))`
	`17`	`+ if file_size < 10000000:`
	`18`	`+ continue`
	`19`	`+ # os.unlink(filename)`
	`20`	`+ print("Deleting " + filename + "... with size " + str(file_size))`
	`21`	`+`
	`22`	`+`
	`23`	`+delete_files(".\\files")`

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	`1`	`+"""`
	`2`	`+Program that walks through a folder tree and searches for files with`
	`3`	`+a certain file extension (.txt). Copy these files from whatever`
	`4`	`+location they are in to a new folder.`
	`5`	`+`
	`6`	`+"""`
	`7`	`+`
	`8`	`+import os`
	`9`	`+import shutil`
	`10`	`+`
	`11`	`+`
	`12`	`+def selective_copy(folder, ext):`
	`13`	`+ """`
	`14`	`+ Perform selective copy of all files in folder tree, that has specified extension.`
	`15`	`+`
	`16`	`+ :param folder: Folder tree to be copied`
	`17`	`+ :param ext: File extension that will be copied`
	`18`	`+ """`
	`19`	`+ os.chdir(folder)`
	`20`	`+ if not os.path.exists('..\\new_dir'):`
	`21`	`+ os.makedirs('..\\new_dir')`
	`22`	`+`
	`23`	`+ for folder_name, subfolders, filenames in os.walk('.'):`
	`24`	`+ for filename in filenames:`
	`25`	`+ if not filename.endswith(ext):`
	`26`	`+ continue`
	`27`	`+ file_path = os.path.join(os.path.abspath(folder_name), filename)`
	`28`	`+ shutil.copy(file_path, '..\\new_dir\\')`
	`29`	`+`
	`30`	`+`
	`31`	`+selective_copy('.\\files\\', '.txt')`