Add list.py to demonstrate list operations and manipulations in Python

Wcoder547 · Wcoder547 · commit 2fb7803d52f5 · 2025-07-03T09:53:21.000+05:00
diff --git a/List/list.py b/List/list.py
@@ -0,0 +1,73 @@
+tea_varities = ["black tea", "Green tea", "Oolong", "white"]
+print(tea_varities)
+
+print(tea_varities[0])          # First item
+print(tea_varities[1:3])        # Slice: index 1 and 2
+
+# Replace index 1 (Green tea) with each character of "Lemon" (bad idea)
+tea_varities[1:2] = "Lemon"
+print("Replacing with string splits each char:", tea_varities)
+
+# Reset list
+tea_varities = ["black tea", "Green tea", "Oolong", "white"]
+# Replace slice with a list — correct way
+tea_varities[1:2] = ["lemon"]
+print("Proper replacement:", tea_varities)
+
+# Replace two items with one
+tea_varities[1:3] = ["lemon"]
+print("Two replaced with one:", tea_varities)
+
+# Insert at index 1 without removing anything
+tea_varities[1:1] = ["test", "test"]
+print("After inserting:", tea_varities)
+
+# Remove a slice
+tea_varities[1:3] = []
+print("After deletion:", tea_varities)
+
+# Looping through the list (line by line)
+for tea in tea_varities:
+    print(tea)
+
+# Looping with dash-separated print
+for tea in tea_varities:
+    print(tea, end="-")
+print()  # new line
+
+# Membership check
+if "Oolong" in tea_varities:
+    print("I have Oolong tea")
+
+# Append "Oolang" (note the typo)
+tea_varities.append("Oolang")
+
+# Membership check again (still "Oolong", not "Oolang")
+if "Oolong" in tea_varities:
+    print("I have Oolong tea")  # won't print
+
+# Remove "green" (will cause error if not found)
+# tea_varities.remove("green")  # ❌ Error: not in list
+
+# So check before removing
+if "green" in tea_varities:
+    tea_varities.remove("green")
+
+# Insert "green" at index 1
+tea_varities.insert(1, "green")
+
+# Copy list
+tea_varities_copy = tea_varities.copy()
+print("Copied list:", tea_varities_copy)
+
+# Append original list to its copy (nested list)
+tea_varities_copy.append(tea_varities)
+print("Nested list:", tea_varities_copy)
+
+# List comprehension
+squared_nums = [x**2 for x in range(10)]
+print("Squared numbers:", squared_nums)
+
+# Just printing range object
+print("Range object:", range(10))  # shows: range(0, 10)
+print("Converted to list:", list(range(10)))  # shows: actual list
