simple-calculator-tc2 1.3

Calculator with memory, supports + - / * sqrt()

Calculator: Simple Memory-Based Arithmetic Module

A tiny Python class that keeps a running memory and performs validated arithmetic operations.

This document explains the module, how to install/use it. It also includes a mini‑tutorial in English

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Features

• Calculator.memory : read only property exposing the current memory value.
• Validated inputs: only int or float are accepted; other types raise TypeError.
• Arithmetic: add, subtract, multiply, divide.
• Utilities: sqrt (adds sqrt(n) to memory), memory_reset (resets to 0.0).
• Clear, Google style docstrings and helpful error messages.

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Installation

This is a single file module. You can:

• drop calculator.py into your project, or
• install it as an editable local package if you later add pyproject.toml/setup.cfg.

Python version: 3.9+ recommended.

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Quick Start (Tutorial)

1) Import and construct

from calculator import Calculator

c = Calculator()
print(c.memory)   # 0.0

2) Basic operations

c.add(10)         # -> 10.0
c.subtract(3.5)   # -> 6.5
c.multiply(2)     # -> 13.0
c.divide(4)       # -> 3.25

3) Square root accumulation

c.sqrt(9)         # adds 3, -> 6.25

4) Reset

c.memory_reset()  # -> 0.0

5) Defensive behavior (errors)

try:
    c.add("3")  # not allowed
except TypeError as e:
    print(e)    # Argument must be an int or float

try:
    c.divide(0) # division by zero
except ZeroDivisionError as e:
    print(e)

try:
    c.sqrt(-1)  # negative sqrt
except ValueError as e:
    print(e)    # Cannot take square root of a negative real number

# read-only property
try:
    c.memory = 42
except AttributeError as e:
    print(e)    # memory is read-only

API Reference

Class: Calculator()

• Properties
  • memory: float : read only; returns the current memory value.
• Methods
  • add(n: float) -> float : Adds n to memory.
  • subtract(n: float) -> float : Subtracts n from memory.
  • multiply(n: float) -> float : Multiplies memory by n.
  • divide(n: float) -> float : Divides memory by n. Raises ZeroDivisionError if n == 0.
  • sqrt(n: float) -> float : Adds sqrt(n) to memory. Raises ValueError if n < 0.
  • memory_reset() -> float :Resets memory to 0.0.

Validation rule: a private helper _to_float converts and validates inputs. Only int and float are accepted

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