Suppose we have boolean expressions b1 and b2 which may be simple boolean variables
Python Keywords. » Identifiers. » Variables. » Data Types. » Operators. » Expressions. » Input and Output. » Debugging. » Functions. » if..else Statements.
Decision making is the selection of a course of action from among available alternatives in order to produce a desired result. • The conditional test either
learning about Python programming language let us Python statement on the >>> prompt directly. As soon as ... operator if first operand is a.
If-else statement. ? Equality and relational operators. ? More if-else. Additional topics: ? Boolean operators and expressions.
In Python 2 the true division operator (/) also truncates the result to an integer if the operands are integers. • Therefore
D. Operators: Operators are symbols used for calculations. The following operators are The if statement in Python constructs the selection statement.
? Using special operators such as LIKE or CONTAINS – Use WHERE statement. ? Directly using any SAS Procedures – Use WHERE statement. ? When merging data
To avoid common errors in if statements (4.8). • To program with selection statements (4.9). • To combine conditions by using logical operators (and or
Boolean Expressions and If. • Flow of Control / Conditional Statements. • The if Statement. • Logical Operators. • The else Clause. • Block statements.
THE ELIF STATEMENT •elifis short for else if •Optional continuation of an if/elif statement Syntax How it is executed 1 Evaluate 2 Execute 3 Go to next statement 2 Evaluate True False True False 3 Execute 4 Go to next statement 3 Go to next statement if : Statements-a
Operator == checks if two values are equal or not; if yes then condition becomes true Ex: write an expression that evaluates to True if and only if variables profits and losses are exactly equal Operator == checks if two values are equal or not; if yes then condition becomes true
The IF statement is used to check if a condition is true Essentially if the condition is true the Python interpreter runs a block of statements called the if-block If the statement is false the interpreter skips the if-block and processes another block of statements called the else-block The else clause is optional
In this section we will examine details of all the Python operators introducedin Table 2 3 We classify these operators both symbols and identi ers intofour categories and examine them separately: Arithmetic (+ - * / // **)Relational: (== != < > = is in) Logical (and not or) and nally Bit{wise (& j ~ ^ >)
The if Statement (cont’d ) • Python syntax: if condition: Statement Statement • First line known as the if clause • Includes the keyword iffollowed by condition •The condition can be true or false •When the ifstatement executes the condition is tested and if it is true the block statements are executed otherwise block statements
When executing a conditional statement each clause is considered in order The computational process of executing a conditional clause follows 1 Evaluate the header's expression 2 If it is a true value execute the suite Then skip over all subsequent clauses in the conditional statement