Expression

An expression is a piece of source code that produces a value at runtime.

Related concepts:  EvaluationValue

Closest Wikipedia entry:  Expression (computer science)

Misconceptions about Expression

51 documented Misconceptions

AssignCompares

= compares two values

CannotChainAttributeAccesses

Attribute accesses cannot be chained together

CannotChainAttributeToObjectInstantiation

Method calls, and attribute accesses in general, cannot be chained to a constructor invocation.

ComparisonWithBoolLiteral

To test whether an expression is True or False, one must compare it to True or to False

MapToBooleanWithTernaryOperator

To map a boolean expression to a bool, a ternary conditional operator is necessary

NoAtomicExpression

Expressions must consist of more than one piece

NoShortCircuit

and/or always evaluate both operands

NoSingleLogicAnd

& is only a bitwise AND

ObjectsMustBeNamed

A variable is needed to instantiate an object

OutsideInFunctionNesting

Nested function calls are invoked outside in

ParenthesesOnlyIfArgument

() are optional for function calls without arguments

PlusConcatenatesNumbers

The plus operator can concatenate strings and numbers

RightToLeftChaining

Chained accesses are invoked from right to left

SelfNoExpression

The name self is not an expression

StringLiteralNoObject

One needs to call str to instantiate a str object from a string literal

VariablesHoldExpressions

= stores an expression: it stores a reference to the expression in a variable