Lec26 updated

f23/Gurmail_Lecture_Notes/26_Files_and_Directories/cs220.txt

...otes/26_Files_and_Directories/files_and_directories.ipynb

...ctories/files_and_directories_template_Gurmail_lec1.ipynb

...ctories/files_and_directories_template_Gurmail_lec2.ipynb

...cture_Notes/26_Files_and_Directories/new_test_dir/out.txt

f23/Gurmail_Lecture_Notes/26_Files_and_Directories/nums.txt

...l_Lecture_Notes/26_Files_and_Directories/some_numbers.txt

...Lecture_Notes/26_Files_and_Directories/test_dir/file1.txt

...Lecture_Notes/26_Files_and_Directories/test_dir/file2.txt

...and_Directories/test_dir/test_dir_depth2/file1_depth2.txt

...and_Directories/test_dir/test_dir_depth2/file2_depth2.txt