Fix syntax errors and undefined variables in Units 1-3

Author: Your Name

Unit-1(basics)/var_practice2.py

@@ -3,6 +3,6 @@
 model_name = "Galaxy S24"
 storage = "256GB"
 
-print("Mobile Brand =", Mobile_Brand)
-print("Model Name =", Model_Name)
-print("Storage =", Storage)
+print("Mobile Brand =", mobile_brand)
+print("Model Name =", model_name)
+print("Storage =", storage)

Unit-1(basics)/var_practice4.py

@@ -1,8 +1,8 @@
 
 bike_name = "Yamaha R15"
-Price     = 525000
-Mileage   = "45 km/l"
+price     = 525000
+mileage   = "45 km/l"
 
-print("Bike Name =", Bike_Name)
-print("Price =", Price)
-print("Mileage =", Mileage)
+print("Bike Name =", bike_name)
+print("Price =", price)
+print("Mileage =", mileage)

Unit-2(strings)/escape_character.py

@@ -38,7 +38,7 @@
 
 
 #4. \ ==> j ho tei bujhauna 
-print('What\'s up')
-print("He said, \"He is learning Python\"")
+# print('What\'s up')
+# print("He said, \"He is learning Python\"")
 
-print("Nepal\\\India\\China\Japan") [Bujhna lai]
+# print("Nepal\\\India\\China\Japan") #[Bujhna lai]

Unit-3(list_and_tuple)/practice_questions.py

@@ -96,7 +96,7 @@
 
 #c. find second and 2nd last element of list
 
-num.count
+# num.count
 
 #d. find length of list. 
 #d. ["orange", "watermelon"] add this list in that list.