Python Syntax Fundamentals

Basic Syntax Rules

Python syntax is designed to be simple and readable. Code blocks are defined using indentation (whitespace) rather than braces or keywords.

**Case Sensitivity**: Python is case-sensitive (`myVar` ≠ `myvar`)
**Indentation**: Use 4 spaces per indentation level (PEP 8 style guide)
**Statements**: Typically one per line (no semicolon required)
**Multi-line Statements**: Continue lines with backslash `\` or by wrapping in parentheses, brackets, or braces
**Docstrings**: Use triple quotes `"""` for multi-line documentation

Identifiers and Keywords

Identifiers are names for variables, functions, and classes. They must follow these rules:

ℹ️ Note: Python reserves 35 keywords such as `if`, `while`, and `def`, which cannot be used as identifiers.

Valid Examples	Invalid Examples	Reason
my_variable	my-variable	Hyphens are not allowed
_private	3d_model	Identifiers cannot start with a digit
MAX_SIZE	for	Keywords cannot be used as identifiers
x1	x!	Special characters (except underscore) are not allowed

Line Structure Example

Example

# Valid multi-line statement using parentheses
total = (item_one +
         item_two -
         item_three)

# Using backslash for explicit continuation
name = "John " + \
       "Doe"

Output

# No output - demonstrates syntax rules

Common Syntax Errors

**IndentationError**: Inconsistent indentation (mixing tabs and spaces)
**SyntaxError**: Missing colon `:` after control statements like if or for
**NameError**: Referring to a variable before assignment
**TypeError**: Performing operations on incompatible types

⚠️ Warning: Python scripts cannot run with syntax errors. They must be corrected before execution.

Python Syntax Fundamentals

Basic Syntax Rules

Python syntax is designed to be simple and readable. Code blocks are defined using indentation (whitespace) rather than braces or keywords.

**Case Sensitivity**: Python is case-sensitive (`myVar` ≠ `myvar`)
**Indentation**: Use 4 spaces per indentation level (PEP 8 style guide)
**Statements**: Typically one per line (no semicolon required)
**Multi-line Statements**: Continue lines with backslash `\` or by wrapping in parentheses, brackets, or braces
**Docstrings**: Use triple quotes `"""` for multi-line documentation

Identifiers and Keywords

Identifiers are names for variables, functions, and classes. They must follow these rules:

ℹ️ Note: Python reserves 35 keywords such as `if`, `while`, and `def`, which cannot be used as identifiers.

Valid Examples	Invalid Examples	Reason
my_variable	my-variable	Hyphens are not allowed
_private	3d_model	Identifiers cannot start with a digit
MAX_SIZE	for	Keywords cannot be used as identifiers
x1	x!	Special characters (except underscore) are not allowed

Line Structure Example

Example

# Valid multi-line statement using parentheses
total = (item_one +
         item_two -
         item_three)

# Using backslash for explicit continuation
name = "John " + \
       "Doe"

Output

# No output - demonstrates syntax rules

Common Syntax Errors

**IndentationError**: Inconsistent indentation (mixing tabs and spaces)
**SyntaxError**: Missing colon `:` after control statements like if or for
**NameError**: Referring to a variable before assignment
**TypeError**: Performing operations on incompatible types

⚠️ Warning: Python scripts cannot run with syntax errors. They must be corrected before execution.

Python Fundamentals

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Python Syntax Fundamentals

Basic Syntax Rules

Identifiers and Keywords

Line Structure Example

Common Syntax Errors

Python Syntax Fundamentals

Basic Syntax Rules

Identifiers and Keywords

Line Structure Example

Common Syntax Errors