python for beginners

Author: parz1val37

Python_Beginners/Advance python/Walrus.py

@@ -0,0 +1,2 @@
+if ( n := len([1, 2, 3,4])) > 3:
+    print(f"List has {n} elements. Expected <= 3.")

Python_Beginners/Advance python/enumerate.py

@@ -0,0 +1,15 @@
+l = [3, 37, 69, 71, 21]
+
+#---Normally---
+# for i in range(len(l)):
+#     print(f"Item at index {i} is {l[i]}")
+#-------OR----
+# index = 0
+# for i in l:
+#     print(f"Item at index {index} is {i}")
+#     index += 1
+
+#----Using enumerate:
+
+for index, i in enumerate(l):
+    print(f"Item at index {index} is {i}")

Python_Beginners/Advance python/exception.py

@@ -0,0 +1,5 @@
+try:
+    x = int(input("Enter a number: "))
+    print(f"You entered: {x}")
+except:
+    print(f"Please enter a valid integer.")    

Python_Beginners/Advance python/finally.py

@@ -0,0 +1,17 @@
+# finally is mainly used in the context of exception handling in Python.
+# mainly under functions.
+
+def divide_numbers(a, b):
+    try:
+        result = a / b
+    except ZeroDivisionError:
+        print("Error: Division by zero is not allowed.")
+        return None
+    else:
+        print(f"{a} divided by {b} gives: {result}")
+    finally:
+        print("Execution of divide_numbers completed.")
+
+divide_numbers(10, 2)
+
+divide_numbers(10, 0)

Python_Beginners/Advance python/join_method.py

@@ -0,0 +1,4 @@
+#----- works for strings ----
+fruits = ['apple', 'banana', 'cherry']
+joined_fruits = ' _ '.join(fruits)
+print(joined_fruits)

Python_Beginners/Advance python/lambda.py

@@ -0,0 +1,12 @@
+#-- using a normal function ---
+
+# def square():
+#     n = int(input("Enter the number to get it's square: "))
+#     print(f"Square of {n} is: {n * n}")
+# square()
+
+#--- using lambda function ---
+
+square = lambda n = int(input("Enter the number to get it's square: ")): print(f"Square of {n} is: {n * n}")
+#--- here lambda takes 'n' :and returns/prints the square of 'n' ---
+square()

Python_Beginners/Advance python/list_comprehension.py

@@ -0,0 +1,14 @@
+l = [1, 3, 5, 7, 9]
+
+#---------using for loop----
+# squared_l = []
+# for i in l:
+#     squared_l.append(i ** 2)
+# print(squared_l)
+
+#---------using list comprehension----
+squared_l_comp = [i ** 2 for i in l]
+print(squared_l_comp)
+
+add_3_in_l = [i + 3 for i in l]
+print(add_3_in_l)

Python_Beginners/Advance python/match case.py

@@ -0,0 +1,13 @@
+def math_quiz():
+    print("Welcome to the Math Quiz!")
+    print("You will be asked a simple math question.")
+    print("What is 2 + 2")
+    x = int(input("Please enter your answer: "))
+    # Using match-case to handle different operations
+    match x:
+        case 4:
+            print("Correct! 2 + 2 equals 4.")
+        case _:
+            print("Incorrect.")
+
+math_quiz()

Python_Beginners/Advance python/merging dict.py

@@ -0,0 +1,5 @@
+dict1 = {"a": 1, "b": 4, "c": 5}
+dict2 = {"b": 3, "d": 6}
+# Merging two dictionaries
+merged_dict = dict1 | dict2
+print("Merged Dictionary:", merged_dict)

Python_Beginners/Advance python/raise error.py

@@ -0,0 +1,8 @@
+a = int(input("Enter a number: "))
+b = int(input("Enter another number: "))
+
+if b == 0:
+    raise ZeroDivisionError("Division by zero is not allowed.")
+else:
+    result = a / b
+    print(f"The result of {a} divided by {b} is {result}.")