1. Control Statements

2. 4 Major Versions of Python
“Python” or “CPython” is written in C/C++
- Version 2.7 came out in mid-2010
- Version came out in early 2010
“Jython” is written in Java for the JVM
“IronPython” is written in C# for the .Net environment
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3. Conditional Steps Yes Program: x = 5 if x < 10: print 'Smaller‘
print 'Bigger'
print 'Finis'
print 'Smaller'
X > 20 ?
Yes
print 'Bigger'
print 'Finis'

4. if
if statement: Executes a set of commands only if a certain condition is True. Otherwise, the commands are skipped.
Syntax:
if condition:
statements
Example:
gpa = input("What is your GPA? ")
if gpa > 2.0:
print "Your application is accepted."

5. Range Test
if (3 <= Time <= 5):
print “Office Hour"

6. The IF Statement Yes No x = 5 if x == 5 : print 'Is 5‘
print 'Is Still 5'
print 'Third 5’
print 'Still 5'
print 'Third 5'
The IF Statement

7. Two-way branch using else :
X = 4
x = 4
if x > 2 :
print 'Bigger'
else :
print 'Smaller'
print 'All done' no
x > 2
yes
print 'Smaller'
print 'Bigger'
print 'All Done'

8. if/else
if/else statement: Executes one set of statements if a certain condition is True, and a second set if it is False.
Syntax:
if condition:
statements
else:
Example:
gpa = input("What is your GPA? ")
if gpa > 2.0:
print "Welcome to Mars University!"
print "Your application is denied."
Multiple conditions can be chained with elif

9. greater than or equal to
Logic
Logical expressions can be combined using logical operators:
Operator
Meaning
Example
Result ==
equals
1 + 1 == 2
True !=
does not equal
3.2 != 2.5
<
less than
10 < 5
False
>
greater than
10 > 5
<=
less than or equal to
126 <= 100
>=
greater than or equal to
5.0 >= 5.0
Operator
Example
Result
and
(9 != 6) and (2 < 3)
True or
(2 == 3) or (-1 < 5)
not
not (7 > 0)
False

10. Nested Decisions x = 42 if x > 1 : print 'More than one'
yes
print 'More than one' no
x = 42
if x > 1 :
print 'More than one'
if x < 100 :
print 'Less than 100'
print 'All done'
x < 100
yes no
print 'Less than 100'
print 'All Done'

11. Chained Conditional if x < 2 : print 'Small' elif x < 10 :
print 'Medium'
elif x < 20 :
print 'Big'
elif x< 40 :
print 'Large'
elif x < 100:
print 'Huge'
else :
print 'Ginormous'
# No Else
x = 5
if x < 2 :
print 'Small'
elif x < 10 :
print 'Medium'
print 'All done'

12. Exercise
Write a pay computation program that gives the employee 1.5 times the hourly rate for hours worked above 40 hours (and regular 1.0 rate for less than 40 hours)
Enter Hours: 45
Enter Rate: 10
Pay: 475.0

13. Example Your city classifies a pollution index
less than 35 as “Pleasant”,
35 through 60 as “Unpleasant”,
and above 60 as “Health Hazard.”
Display the correct description of the
pollution index value.

14. Example
Display one word to describe the integer value of number as “Positive”, “Negative”, or “Zero”

15. Example
Write a program to ask a student for his grades in 3 exams ( each out of 50 ) , get their total and inform the student whether he passed or failed the course.