for i in range(5):
print(i, i**2)0 0
1 1
2 4
3 9
4 16
Notice above that we used for i in range(5) which includes 5 elements but starts with 0 and ends with 4.
If we wanted the numbers 1 through 5 we would instead use the loop for i in range(1,6).
print('This is the start of the program.')
print('This is the start of iteration.')
for i in range(12):
#This is the start of the for loop.
print('i is: {}'.format(i)) #This happens every iteration
if i % 2 == 0:
print('i is even')
elif i in [3,5,7,11]:
print('i is prime!')
elif i == 4:
print('i is 4') #This will never actually happen because the conditional terminates since 4 is also even
else:
print('i is odd, but not prime')
print('\n') #This is outside both conditional blocks. This happens once per iteration
#Iteration completes, program returns to start of iteration block.
print('For loop complete.')
print('Script complete.')This is the start of the program.
This is the start of iteration.
i is: 0
i is even
i is: 1
i is odd, but not prime
i is: 2
i is even
i is: 3
i is prime!
i is: 4
i is even
i is: 5
i is prime!
i is: 6
i is even
i is: 7
i is prime!
i is: 8
i is even
i is: 9
i is odd, but not prime
i is: 10
i is even
i is: 11
i is prime!
For loop complete.
Script complete.
Notice the common conditional i % 2 == 0 which is used to determine if a number is even (or odd). Recall that the % operator returns the remainder when dividing i by 2. Equivalently, this is i mod 2.
Also note that the second elif clause elif i == 4 is never executed because the conditional block completes as soon as a clause is true. In the below example, we examine how multiple conditional blocks can be chained.
Another style that can be explored is combining multiple conditions such as if i > 5 and i < 10: or if i == 7 or i > 8:. In general, combining statements such as this should be used as opposed to nesting conditional blocks within each other which can become difficult to read. For example:
for i in range(50):
if i >5:
#Works but cautionary style. Often can become difficult to read. Do not overnest conditionals.
if i < 10:
print(i)#to be executed6
7
8
9
print('This is the start of the program.')
print('This is the start of iteration.')
for i in range(12):
#This is the start of the for loop.
print('i is: {}'.format(i)) #This happens every iteration
print('This is the first condition block.')
#This is the start of our conditional block
if i < 6:
print('i is less then 6') #This is inside the 'if i < 6 condition'
elif i % 2 == 0:
print('i is even') #This is inside the 'elif i % 2 == 0 condition'
print('this statement only executes if the if condition above (i<6) is false.')
#The elif condition is only reached if the preceeding if statement is false.
#Once one of the branches is triggered, the program exits this entire conditional block
elif i == 7:
print('i is 7!')
else:
print('Bigger then 7, and odd')
#End of first conditional block
#Start of second conditional block
print('This is the second condition block.')
if i % 2 == 0:
print('i is even')
else:
print('i is odd')
#End of second contional block
print('\n') #This is outside both conditional blocks. This happens once per iteration
#Iteration completes, program returns to start of iteration block.
print('For loop complete.')
print('Script complete.')This is the start of the program.
This is the start of iteration.
i is: 0
This is the first condition block.
i is less then 6
This is the second condition block.
i is even
i is: 1
This is the first condition block.
i is less then 6
This is the second condition block.
i is odd
i is: 2
This is the first condition block.
i is less then 6
This is the second condition block.
i is even
i is: 3
This is the first condition block.
i is less then 6
This is the second condition block.
i is odd
i is: 4
This is the first condition block.
i is less then 6
This is the second condition block.
i is even
i is: 5
This is the first condition block.
i is less then 6
This is the second condition block.
i is odd
i is: 6
This is the first condition block.
i is even
this statement only executes if the if condition above (i<6) is false.
This is the second condition block.
i is even
i is: 7
This is the first condition block.
i is 7!
This is the second condition block.
i is odd
i is: 8
This is the first condition block.
i is even
this statement only executes if the if condition above (i<6) is false.
This is the second condition block.
i is even
i is: 9
This is the first condition block.
Bigger then 7, and odd
This is the second condition block.
i is odd
i is: 10
This is the first condition block.
i is even
this statement only executes if the if condition above (i<6) is false.
This is the second condition block.
i is even
i is: 11
This is the first condition block.
Bigger then 7, and odd
This is the second condition block.
i is odd
For loop complete.
Script complete.
You can quickly generate a list of numbers by using the range function. Use a for loop to iterate through the numbers 1 to 100, inclusive, print the number n, along with the following conditional actions:
- If n is odd, print ‘is odd’
- If n is even and divisible by 7, print ‘is divisible by 14’
- If n is divisible by 5, but not even, print ‘high five!’
- If n is greater than 30, less then 45 and divisible by 8, print ‘this happens twice!’
# Your code hereWrite a condition to determine if the number is prime.
# Your code here
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