Chapter 9 IF Statement

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Chapter 9 IF Statement Bernard Chen

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Chapter 9 IF Statement. Bernard Chen. If Statement. The main statement used for selecting from alternative actions based on test results It’s the primary selection tool in Python and represents the Logic process. Some Logic Expression. Equal: “==” NOT Equal: “!=” Greater: “>”, “>=” - PowerPoint PPT Presentation

Transcript of Chapter 9 IF Statement

Page 1: Chapter 9 IF Statement

Chapter 9 IF Statement

Bernard Chen

Page 2: Chapter 9 IF Statement

If Statement

The main statement used for selecting from alternative actions based on test results

It’s the primary selection tool in Python and represents the Logic process

Page 3: Chapter 9 IF Statement

Some Logic Expression

Equal: “==”

NOT Equal: “!=”

Greater: “>”, “>=”

Less than: “<”, “<=”

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Outline

Simple If statement If... else statement If… else if … else statement

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Simple If statement

It takes the form of an if test

if <test>: <statement>

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Simple If statement if 4>3: print “it is true that 4>3”

if 1: print “true”

a=10 if a==10:

print “a=10”

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If... else statement

It takes the form of an if test, and ends with an optional else block

if <test>: <statement1> else: <statement2>

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If... else statement if 3>4: print “3 is larger than 4” else: print “3 is NOT larger than 4”

if 0: print “true” else: print “false”

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If... else statement a=10 if a==10:

print “a=10” else: print “a is not equal to 10”

a=10 if a!=10:

print “a=10” else: print “a is not equal to 10”

(also try >, < )

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If… else if … else statement It takes the form of an if test, followed

by one or more optional elif tests, and ends with an optional else block

if <test1>: <statement1>elif <test2>:

<statement2>else: <statement3>

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If… else if … else statement

a=10 if a>10:

print “a > 10” elif a==10:

print “a = 10” else: print “a < 10”

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If… else if … else statement examplenumber = 23guess = int(raw_input('Enter an integer : '))

if guess == number:print 'Congratulations, you guessed it.' # New block starts hereprint "(but you do not win any prizes!)" # New block ends here

elif guess < number:print 'No, it is a little higher than that' # Another block# You can do whatever you want in a block ...

else:print 'No, it is a little lower than that'# you must have guess > number to reach here

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Some More Logic Expression

and >>> 5>4 and 8>7True>>> 5>4 and 8>9False

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Some More Logic Expression

or >>> 5>4 or 8>7True>>> 5>4 or 8>9True


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