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main.py

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+
+
+def convert_to_decimal(qwerty, expression):
+    decimal_equivalent = 0
+    for char in expression:
+        decimal_equivalent = decimal_equivalent * len(qwerty) + qwerty.index(char)
+    return decimal_equivalent
+
+def convert_to_custom_base(qwerty, number):
+    if number == 0:
+        return '0'
+    custom_base_representation = ''
+    while number > 0:
+        remainder = number % len(qwerty)
+        custom_base_representation = qwerty[remainder] + custom_base_representation
+        number = number // len(qwerty)
+    return custom_base_representation
+
+def calculate_expression(qwerty, expression):
+    expression = expression.replace('+', ' + ').replace('-', ' - ').replace('*', ' * ').replace('/', ' / ')
+    components = expression.split()
+    components_decimal = [convert_to_decimal(qwerty, component) if component not in ['+', '-', '*', '/'] else component for component in components]
+    decimal_result = eval(''.join(map(str, components_decimal)))
+    custom_base_result = convert_to_custom_base(qwerty, decimal_result)
+    regular_base_result = convert_to_custom_base("012345", decimal_result)
+    return decimal_result, custom_base_result, regular_base_result
+
+custom_system = input("Enter your custom numeric system: ")
+print("Custom numeric system:", custom_system)
+
+base = len(custom_system)
+print("Base:", base)
+
+print("Equivalent of each character in common numeric system:")
+for index, char in enumerate(custom_system):
+    print(f"{char}={index}, ", end='')
+
+expression = input("\nEnter the expression to calculate: ")
+
+decimal_result, custom_base_result, regular_base_result = calculate_expression(custom_system, expression)
+
+print("Answer:")
+print(expression.replace("+", " + ").replace("-", " - ").replace("*", " * ").replace("/", " / "), "=", custom_base_result, "(base", base, ")")
+print(f"{regular_base_result} (base {base})")
+print(f"{decimal_result} (base 10)")