# Python nested loops

## Syntax

for iterating_var in sequence: for iterating_var in sequence: statements(s) statements(s)

The syntax for a **nested while loop** statement in Python programming language is as follows −

while expression: while expression: statement(s) statement(s)

## Example

The following program uses a nested for loop to find the prime numbers from 4 to 100i = 4 while(i < 100): j = 4 while(j <= (i/j)): if not(i%j): break j = j + 1 if (j > i/j) : print i, " is prime" i = i + 1 print "thanks!"When the above code is executed, it produces following result −

$python main.py 4 is prime 5 is prime 6 is prime 7 is prime 8 is prime 9 is prime 10 is prime 11 is prime 12 is prime 13 is prime 14 is prime 15 is prime 17 is prime 18 is prime 19 is prime 21 is prime 22 is prime 23 is prime 26 is prime 27 is prime 29 is prime 31 is prime 33 is prime 34 is prime 37 is prime 38 is prime 39 is prime 41 is prime 43 is prime 46 is prime 47 is prime 51 is prime 53 is prime 57 is prime 58 is prime 59 is prime 61 is prime 62 is prime 67 is prime 69 is prime 71 is prime 73 is prime 74 is prime 79 is prime 82 is prime 83 is prime 86 is prime 87 is prime 89 is prime 93 is prime 94 is prime 97 is prime thanks!