Create file_io_intro.py

Author: woliul

day_13_File_IO/file_io_intro.py

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+# Day 13: File I/O - Reading and Writing to Files
+
+# File I/O (Input/Output) allows your program to interact with files
+# on your computer's storage.
+
+# Best practice: use the 'with open(...)' statement. It automatically
+# closes the file for you, even if errors occur.
+
+# 1. Writing to a file using 'w' mode (write)
+# The 'w' mode creates the file if it does not exist, or overwrites it if it does.
+print("Writing to file...")
+with open("notes.txt", "w") as file:
+    file.write("Hello, Python learner!\n")
+    file.write("This is a new line of text.\n")
+    file.write("This information will be saved permanently.")
+print("Done writing to notes.txt.")
+
+# 2. Reading from a file using 'r' mode (read)
+# The 'r' mode opens the file for reading.
+print("\nReading from file...")
+with open("notes.txt", "r") as file:
+    file_content = file.read() # Reads the entire content as a single string
+    print("File content:")
+    print(file_content)
+
+# 3. Appending to a file using 'a' mode (append)
+# The 'a' mode adds new content to the end of the file without overwriting it.
+print("\nAppending to file...")
+with open("notes.txt", "a") as file:
+    file.write("\nThis is an appended line of text.")
+print("Done appending.")
+
+# Let's read the file again to see the appended content
+print("\nReading file after appending...")
+with open("notes.txt", "r") as file:
+    final_content = file.read()
+    print("Final file content:")
+    print(final_content)