• body
  • The sequence of statements within a compound statement.
• boolean expression
  • An expression whose value is either True or False.
• branch
  • One of the alternative sequences of statements in a conditional statement.
• chained conditional
  • A conditional statement with a series of alternative branches.
• comparison operator
  • One of the operators that compares its operands ==, !=, >,<>=, and <=
• conditional statement
  • A statement that controls the flow of execution depending on some condition.
• condition
  • The boolean expression in a conditional statement that determines which branch is executed.
• compound statement
  • A statement that consists of a header and a body. The header ends with a colon (). The body is indented relative to the header.
• guardian pattern
  • Where we construct a logical expression with additional comparisons to take advantage of the short-circuit behavior.
• logical operator
  • One of the operators that combines boolean expressions and, or, and not.
• nested conditional
  • A conditional statement that appears in one of the branches of another conditional statement.
• traceback
  • A list of the functions that are executing, printed when an exception occurs.
• short circuit
  • When Python is part-way through evaluating a logical expression and stops the evaluation because Python knows the final value for the expression without needing to evaluate the rest of the expression.