Range( )+FOR

IMPORTANT!!

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The Google Meet Link for today is :

meet.google.com/jwu-reem-ygo

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By the end of this session you will be able to:

• understand the working of the variety of range( ) functions
• Apply the concept learnt to to create range to solve the given problem
• To be able to create for loop to solve the problem at hand. 

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The range( ) function-

• The range( ) function of Python is used with the FOR Loop.
• The range( ) function generates a LIST which is a special sequence type.
• Let us now see how the range function works.

A) The common use of range( ) is in the form given below:
   range(<lower limit> ,<upper limit>)      # both limits should be integer

For example
1)   range(0,5)
will produce list as [0,1,2,3,4]
2) range (12,18)
will produce list as [12,13,1415,16,17]
B) The other use of range( ) is in the form given below:
   range(<lower limit> ,<upper limit>,< step value>)
For example
1)   range(0,5,1)
will produce list as [0,1,2,3,4]
2) range (0,5,2)
will produce list as [0,2,4]
C) The other use of range( ) is in the form given below:
 range(<number>) 
This creates a list from 0(Zero) to number>-1
For example
1)   range(5)

will produce list as [0,1,2,3,4]

Let us also look at the Operators in and not in (MEMBERSHIP OPERATORS)

A) in Operator:

• used with range( ) in for loop
• it is used to check whether a value is contained inside a list.
• Example-
• 3 in [1,2,3,4]     will return True as the value 3 is contained in the list[12,3,4]
• 5 in [1,2,3,4]     will return False as the value 5 is not contained in the list[12,3,4]    
• 'a' in "trade"     will return True as the value 'a'  is contained in the string (list of characters)-"trade".          

B)   not in Operator:  

used with range( ) in for loop

• it is used to check whether a value is not contained inside a list.
• it is the opposite of in operator 
• Example-
• 3 not in [1,2,3,4]     will return False as the value 3 is contained in the list[12,3,4]
• 5 not in [1,2,3,4]     will return True as the value 5 is not contained in the list[12,3,4] 
• 'b' not in "trade"     will return True as the value 'b'  is  not contained in the string (list of characters)-"trade".    

Let us look at a few examples of FOR loop:

1.

               for v in [1,2,3]:

                         print(v*v)

The above program will produce the following output:

1

4

9

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2.             for ch in 'columbas'

                           print(ch)

The above program will produce the following output:      

c

o

l

u

m

b

a

s

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3.                 for val  in range(3,9):

                         print(val)

The above program will produce the following output:    

3

4

5

6

7

8

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PROGRAM TO PRINT FIRST 10 NATURAL NUMBERS USING FOR LOOP

for num in range(1,10):

      print(num)

The OUTPUT will be:

NOTE:

If the FOR loop is 

      for n in range(1,num) 

Then the FOR loop continues till num-1 

Example 

      for num in range(1,10)     ,    will end at 9

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EXERCISE

Write a program in Python to print all even numbers till 20

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