added handling files tutorial

Author: x4nth055

python-standard-library/handling-files/README.md

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+# [How to Handle Files in Python using OS Module](https://www.thepythoncode.com/article/file-handling-in-python-using-os-module)

python-standard-library/handling-files/listing_files.py

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+import os
+
+# print the current directory
+print("The current directory:", os.getcwd())
+
+# make an empty directory (folder)
+os.mkdir("folder")
+# running mkdir again with the same name raises FileExistsError, run this instead:
+# if not os.path.isdir("folder"):
+#     os.mkdir("folder")
+# changing the current directory to 'folder'
+os.chdir("folder")
+# printing the current directory now
+print("The current directory changing the directory to folder:", os.getcwd())
+
+# go back a directory
+os.chdir("..")
+
+# make several nested directories
+os.makedirs("nested1/nested2/nested3")
+
+# create a new text file
+text_file = open("text.txt", "w")
+# write to this file some text
+text_file.write("This is a text file")
+
+# rename text.txt to renamed-text.txt
+os.rename("text.txt", "renamed-text.txt")
+
+# replace (move) this file to another directory
+os.replace("renamed-text.txt", "folder/renamed-text.txt")
+
+# print all files and folders in the current directory
+print("All folders & files:", os.listdir())
+
+# print all files & folders recursively
+for dirpath, dirnames, filenames in os.walk("."):
+    # iterate over directories
+    for dirname in dirnames:
+        print("Directory:", os.path.join(dirpath, dirname))
+    # iterate over files
+    for filename in filenames:
+        print("File:", os.path.join(dirpath, filename))
+# delete that file
+os.remove("folder/renamed-text.txt")
+# remove the folder
+os.rmdir("folder")
+
+# remove nested folders
+os.removedirs("nested1/nested2/nested3")
+
+open("text.txt", "w").write("This is a text file")
+
+# print some stats about the file
+print(os.stat("text.txt"))
+
+# get the file size for example
+print("File size:", os.stat("text.txt").st_size)