file operations

src/basic/basic_operators.py

@@ -63,7 +63,6 @@ a = 10
 b = 20
 c = a
 
-print(a is not b)  # True
 print(a is c)  # True
 
 # Ternary Operator in Python

src/basic/services/__init__.py

@@ -1,5 +1,5 @@
 # It’s a special file that makes Python treat a directory as a package.
-# it can be empty or we can exports with __all__
+# it can be empty, or we can export with __all__
 
 from .product_service import my_product_one
 
@@ -10,7 +10,7 @@ __all__ = ["my_product_one"]  # see below
 # 1. from services import my_product_one
 # 2. from services import helper_product_from_product_file # this will give error [cannot import name 'helper_product_from_product_file' from 'services']
 
-# to use helper_product_from_product_file  function or class we can able to access by package name (module name) like
+# to use helper_product_from_product_file  function or class we can access by package name (module name) like
 # ==>  from services.product_service import helper_product_from_product_file
-# But we can able to access the my_product_one function like this
+# But we can access the my_product_one function like this
 # ==> from services import my_product_one

src/intermediate/file_handling/file-operations.py

@@ -0,0 +1,84 @@
+# import os
+
+def read_file():
+    my_file = open("notes.txt", 'r')
+    print(my_file.read())
+    # good practices to close the file once completed our operations
+    my_file.close()  # we need to close the file manually.to close automatically use 'with open'
+
+    # if the file is not exist it will create one and writes
+    # if the file exist it will clear all content then writes ours
+    my_second_file = open("notes2.txt", 'w')
+    my_second_file.write("This is my notes2 from code")  # write function will add our data into buffer collection
+    # the close function will save the collected buffer data to file
+    my_second_file.close()
+
+
+def read_text_file(file_path):
+    # if we use this it will automatically close the file after the code exclusion
+    with open(file_path, "r") as file:
+        print(file.read())
+
+
+def read_line(file_path):
+    with open(file_path, "r") as file:
+        print(file.readline())
+        print(file.readlines())
+        # read() function will move the curser to the next line
+        # To move file's curser to top use seek 0 is first line
+        print(file.seek(0))  # seek(0) → go back to start of file
+        print(file.seek(10))  # seek(10) → move to the 10th character/byte
+        print(file.readline())
+        print(file.tell())  # file.tell() → gives the current cursor position (byte index).
+
+
+def write_text_file(file_path, message):
+    with open(file_path, 'w') as file:
+        print(file.write(message))
+
+
+def update_text_file(file_path, message):
+    with open(file_path, 'a') as file:
+        file.write("\n" + message)
+
+
+if __name__ == "__main__":
+    read_file()
+    read_text_file('notes.txt')
+    read_line('notes.txt')
+    write_text_file(file_path="notes.txt", message="My sample file content")
+    update_text_file("notes.txt", "This line will update 2")
+
+'''
+Read modes
+
+"r" → read text
+
+"rb" → read binary
+
+"r+" → read + write
+
+Write modes
+
+"w" → write text (overwrite/create)
+
+"wb" → write binary (overwrite/create)
+
+"w+" → read + write (overwrite/create)
+
+Append modes
+
+"a" → append text (create if not exists)
+
+"ab" → append binary
+
+"a+" → append + read
+
+Exclusive creation modes
+
+"x" → create new (fail if exists)
+
+"xb" → create new binary (fail if exists)
+
+"x+" → create new + read/write
+'''

src/intermediate/file_handling/notes.txt

@@ -0,0 +1,2 @@
+My sample file content
+This line will update