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.

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

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.

(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

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