?1? - i
?2? - 10

Python provides two types of looping constructs:
(i) while loop
(ii) for loop

Syntax:
variable = variablel if condition else variable 2

Output:
Enter any number: 56
56 is an even number
Output 2:
Enter any number: 67
67 is an odd number

There may be situations in our real life programming where we need to skip a segment or set of statements and execute another segment based on the test of a condition. This is called alternative or branching.

The range() is a built-in function, to generate series of values between two numeric intervals.
The syntax of range() is as follows:
range (start,stop,[step])
Where,
start - refers to the initial value
stop - refers to the final value
step - refers to increment value, this is optional part.

A program statement that causes a jump of control from one part of the program to another is called control structure or control statement.

Syntax:
if < condition >:
          statements-block 1
else:
          statements-block 2

The break statement terminates the loop containing it. Control of the program flows to the statement immediately after the body of the loop.

There are three important control Structures
(i) Sequential
(ii) Alternative or Branching
(iii) Iterative or Looping

pass statement is generally used as a placeholder. When we have a loop or function that is to be implemented in the future and not now, we cannot develop such functions or loops with empty body segment because the interpreter would raise an error. So, to avoid this we can use pass statement to construct a body that does nothing.

range (1,30,1) - will start the range of values from 1 and end at 29
range (2,30,2) - will start the range of values from 2 and end at 28
range (30,3,-3) - will start the range of values from 30 and end at 6
range (20) - will consider this value 20 as the end value(or upper limit) and starts the range count from 0 to 19 (remember always ranget) will work till stop -1 value only)

for var in sequence:
# code inside for loop
if condition:

while test expression:
#code inside while loop
if condition:

Simple if statement: Simple if is the simplest of all decision making statements. Condition should be in the form of relational or logical expression.
Syntax:
if :
statements-block1
In the above syntax if the condition is true statements - block 1 will be executed.
Example: Program to check the age and print whether eligible for voting
x=int (input("Enter your age :"))
if x > = 18:
print ("You are eligible for voting")
Output 1:
Enter your age: 34
You are eligible for voting
Output 2:
Enter your age: 16
>>>

Syntax :
      while <condition>;
                statements block 1
       [else:
                statements block2]

(i) The if.. else statement provides control to check the true block as well as the false block,
(ii) Syntax :
     if <condition> :
           statemets-block 1
     else :
           statement-block 2
(iii) if..else statement thus provides possibilities and the condition  determines which BLOCK is to be executed.

for i in range (1, 6) :
for j in range (65, 65 + i)
         a = chr(j)
print a
print

(i) for i in range (5, 0,-1):
for j in range (1, i + 1):
print (i, end =' ')
print (end = '\n')
i+ = 1
(ii) for i in range (5, 0, -1):
for j in range (1, i + 1):
print (j end =' ')
print (i, end = '\n')
i+ = 1

for i in range (1,6):
for j in range (1, i+1)
print (i, end =' ')
print (end = '\n')
i+ = 1

The jump statement in Python, is used to unconditionally transfer the control from one part of the program to another. There are three keywords to achieve jump statements in Python: break, continue, pass. The following flowchart illustrates the use of break and continue.

(i) break statement: The break statement terminates the loop containing it. Control of the program flows to the statement immediately after the body of the loop. A while or for loop will iterate till the condition is tested false, but one can even transfer the control out of the loop (terminate) with help of break statement. When the break statement is executed, the control flow of the program comes out of the loop and starts executing the segment of code after the loop structure. If break statement is inside a nested loop (loop inside another loop), break will terminate the innermost loop.
Syntax:
break
(ii) Continue statement: Continue statement unlike the break statement is used to skip the remaining part of a loop and start with next iteration.
Syntax:
continue
(iii) Pass statement: pass statement is generally used as a placeholder. When we have a loop or function that is to be implemented in the future and not now, we cannot develop such functions or loops with empty body segment because the interpreter would raise an error. So, to avoid this we can use pass statement to construct a body that does nothing.
Syntax:
pass

Multiplication table :
num =int(input("Enter the number: "))
print("multiplication Table of", num)
for i in range(1,11):
        print (num,"x",i, "= ",num*i )
Output :
Enter the number : 6
Multiplication Table of 6
6 x 1 = 6
6 x 2 = 12
6 x 3 = 18
6 x 4 = 24
6 x 5 = 30
6 x 6 = 36
6 x 7 = 42
6 x 8 = 48
6 x 9 = 54
6 x 10 = 60.

for i in range (100, 1000):
     if a%2==1:
              print b
Output :
101,103,105,107,...........,997,999

Nested if..elif..else statement :
(i) When we need to construct a chain of if statement(s) then 'elif' clause can be used instead of 'if else'.
(ii) Syntax:
if < condition - 1>:
      statements-block 1
elif < condition - 2>:
       statements-block 2
else:
       statements-block n
(iii) In the syntax of if..elif ..else mentioned above, condition -1 is tested if it is true then statements-block 1 is executed, otherwise, the control checks condition-2, if it is true statements-block 2 is executed and even if it fails statements-block n mentioned in else part is executed.

(iv) 'elif' clause combines if..else-if ..else statements to one if..elif ... else. 'elif' can be considered to be abbreviation of 'else if'. In an 'if' statement there is no limit of 'elif' clause that can be used, but an 'else' clause if used should be placed at the end.
(v) Example: # Program to illustrate the use of nested if statement

m1 = int (input("Enter mark in first subject:"))
m2 = int (input("Enter mark in second subject:"))
avg = (m1+m2)/2
if avg > =80:
   print ("Grade : A")
elif avg > =70 and avg < 80:
   print ("Grade : B")
elif avg > =60 and avg < 70:
   print ("Grade : C")
elif avg > =50 and avg < 60:
   print ("Gradec: D")
else:
   print("Grade : E")
Output 1:
Enter mark in first subject : 34
Enter mark in second subject : 78
Grade : D
Output 2:
Enter mark in first Subject : 67
Enter mark in  second subject : 73
Grade: B

(i) for loop : The for loop usually known as a definite loop, because the programmer knows exactly how many times the loop will be executed.
(ii) Syntax:
for counter_variable in sequence:
     statements - block 1
[else: # optional block
     statements - block 2]
(iii) The for ... in statement is a looping statement used in Python to iterate over a sequence of objects, i.e., it goes through each item in a sequence. Here the sequence is the collection of ordered or unordered values or even a string.
(iv) range (): The range() is a built-in function,to generate series of values between two numeric intervals
(iv) The syntax of range() follows :
range (start, stop, [step])
Where,
start - refers to the initial value
stop - refers to the final values
step - refers to increment value, this is optional part.
Examples for range( ):
range (1,30,1) - will start the range of values from 1 and end at 29
range (2,30,2) - will start the range of values from 2 and end at 28
range (30,3,-3) - will start the range of values from 30 and end at 6.
range (20) - will consider this value 20 as the end value and starts the range count from 0 to 19 

Example :
# Program to illustrate the use of for loop - to print single digit even number 
for i in range (2,10,2):
       print (i, end=' ')
Output :
2 4 6 8