py variables ad file nameing rules

.gitignore

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+.venv

README.md

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+# Python
+
+Checking Python version on Windows machine
+py -3 --version
+
+Linux/macOS
+python3 --version
+
+if this comments give error make sure you installed the python
+link -> https://www.python.org/downloads/ 
+
+Python in VS Code

src/basic/file.md

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+# Python File Naming & Interpreter Requirements
+
+## 1. Technical Rules (Python Interpreter Requirements)
+
+- **File extension** must be `.py` for a normal Python source file.
+- **No spaces** — Python allows them, but spaces in filenames make imports painful.  
+  ❌ `my script.py` → `import my script` ❌ (syntax error)  
+  ✅ Use underscores: `my_script.py`
+- Only letters, numbers, and underscores are safe.  
+  Allowed: `a_z0_9`  
+  Avoid: `-` (hyphen), `@`, `#`, `.` (except before `.py`)
+- Must not start with a number (if you plan to import it).  
+  ❌ `123module.py` → import fails  
+  ✅ `module123.py`
+- Avoid same name as Python standard library modules (to prevent shadowing).  
+  ❌ `math.py` → will block importing Python’s built-in math module.
+- **Case sensitivity** depends on OS:
+  - Windows/macOS (default FS): `MyFile.py` == `myfile.py`
+  - Linux: case-sensitive — they’re different files.
+
+---
+
+## 2. PEP 8 Style Recommendations (Best Practices)
+
+- Use lowercase letters.
+- Use underscores (`snake_case`) for readability.  
+  ✅ `data_parser.py`  
+  ✅ `config_loader.py`
+- Keep names short but descriptive.
+- Avoid overly generic names like `test.py`, `main.py` unless their role is obvious.
+- If it’s a package directory, include an `__init__.py` file.
+
+---
+
+## 3. Special Cases
+
+**a) `__init__.py`**
+
+- Marks a directory as a Python package.
+- Can be empty or hold package-level imports.
+
+**b) `__main__.py`**
+
+- Lets a package run with:
+  ```bash
+  python -m package_name
+  ```
+
+**c) Dunder files (`__something__.py`)**
+
+- Reserved for Python internals (e.g., `__init__.py`, `__main__.py`).
+- Avoid naming your own files like this unless required.
+
+---
+
+## 4. Good Examples
+
+✅ `data_cleaner.py`  
+✅ `user_auth.py`  
+✅ `ml_model_training.py`
+
+---
+
+## 5. Bad Examples
+
+❌ `data cleaner.py` (space)  
+❌ `DataCleaner.py` (CamelCase is discouraged for files, reserved for classes)  
+❌ `math.py` (shadows standard library)  
+❌ `my-script.py` (hyphen breaks import)

src/basic/variables.py

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+# Declaring Variables
+# No var, let, or const keywords.
+# Type is inferred from the assigned value.
+
+# Core Primitive Types
+whole_number = 10            # int       whole numbers
+normal_text = "Hello"        # str       text
+decimal_value = 3.14         # float     decimal numbers
+# boolean   True / False  Subclass of int (bool behaves like int)
+is_eligible = True
+# True + True  # 2
+name = None                  # NoneType  null
+
+# Integers
+x = 42
+print(type(x))
+
+# Floating-Point Numbers
+y = 3.14
+print(type(y))
+
+# Complex Numbers
+z = 2 + 3j
+print(type(z))              # <class 'complex'>
+
+# str(Standard String)
+single_qoutes = 'World'
+double_quotes = "Hello"
+multiline = """This is
+a multi-line
+string."""
+
+# f-Strings
+name = "Ani"
+f"Hello, {name.upper()}!"
+print(f"{name}")
+print(F"{name}")
+
+
+s = "Python"
+s[::-1]  # Reverse
+
+
+# Type Hints
+name: str = "Anikuttan"
+age: int = 78
+
+# Special / Advanced Types
+b = b"hello"               # bytes (immutable)
+ba = bytearray(b"hello")    # mutable
+m = memoryview(b)           # zero-copy slice view
+
+# Multiple Assignment
+a, b, c = 1, 2, 3
+x = y = z = 10
+
+# Unpacking
+numbers = [1, 2, 3]
+a, b, c = numbers
+a, *rest = range(5)      # a = 0, rest = [1, 2, 3, 4]
+
+# Swapping
+x, y = y, x
+
+# Dynamic Typing & Type Checking
+x = 42
+x = "string now"  # Allowed
+
+type(x)           # <class 'str'>
+isinstance(x, str)  # True