A number is known as a spy number if the sum of its digits is exactly equal to the product of its digits.

The code defines a function `checkSpy`

that takes an integer `number`

as input and returns a boolean value indicating whether `number`

is a spy number or not.

The function starts by initializing two variables `sum`

and `mul`

to 0 and 1, respectively. These variables will be used to keep track of the sum and product of the digits of `number`

.

The function then uses a `while`

loop to repeatedly extract the last digit of `number`

and update `sum`

and `mul`

accordingly. The `while`

loop runs until `number`

becomes 0.

For each iteration of the loop, the code uses the modulo operator (`%`

) to extract the last digit of `number`

, which is stored in the variable `rem`

. The code then adds `rem`

to `sum`

and multiplies `mul`

by `rem`

. The code uses integer division (`//`

) to remove the last digit of `number`

, and the `int`

function to convert the result to an integer.

After the `while`

loop, the code uses an `if`

statement to check if the sum of the digits of `number`

is equal to their product. If `sum`

is equal to `mul`

, the code returns `True`

, indicating that `number`

is a spy number. If `sum`

is not equal to `mul`

, the code returns `False`

, indicating that `number`

is not a spy number.

The code then asks the user to input a number, and converts the input to an integer using the `int`

function. The input value is then passed as an argument to the `checkSpy`

function.

The code uses another `if`

statement to check if the result of `checkSpy`

is `True`

. If `checkSpy`

returns `True`

, the code prints the message “X is a spy number”, where X is the value of `number`

. If `checkSpy`

returns `False`

, the code prints the message “X is not a spy number”.

The `str`

function is used to convert the value of `number`

to a string representation, so that it can be concatenated with the string literals in the `print`

statements.

This code demonstrates how to use a function, a `while`

loop, and an `if`

statement to determine if a number is a spy number, which is a number that has the sum of its digits equal to their product.

```
def checkSpy(number):
sum, mul = 0, 1
while number > 0:
rem = number % 10
sum += rem
mul *= rem
number = int(number / 10)
if sum == mul:
return True
else:
return False
number = int(input("Enter a number to check for spy number: "))
if checkSpy(number) == True:
print(str(number) + " is a spy number")
else:
print(str(number) + " is not a spy number")
```

```
Enter a number to check for spy number: 123
123 is a spy number
```

The code defines a function `checkSpy`

that takes in an integer `number`

as an argument and returns `True`

if the number is a spy number or `False`

otherwise.

A spy number is defined as a number where the sum and product of its digits are equal.

The function first initializes two variables `sum`

and `mul`

to 0 and 1 respectively. Then, it uses a while loop to repeatedly divide the `number`

by 10, until it becomes 0. At each iteration of the loop, the remainder of the division is found and added to the `sum`

and multiplied with the `mul`

. This gives us the sum and product of the digits of the number.

If the `sum`

is equal to `mul`

, the function returns `True`

, otherwise it returns `False`

.

The main part of the code then prompts the user to enter the upper bound `max`

for finding spy numbers. The code then uses a for loop to iterate from 1 to `max`

, and calls the `checkSpy`

function for each number. If the result of the function is `True`

, the number is printed as a spy number.

The end of the output is suppressed by setting `end`

to a space character in the `print`

statement, this ensures that the spy numbers are printed on the same line, separated by spaces.

```
def checkSpy(number):
sum, mul = 0, 1
while number > 0:
rem = number % 10
sum += rem
mul *= rem
number = int(number / 10)
if sum == mul:
return True
else:
return False
max = int(input("Enter the upper bound to find spy numbers: "))
print("Spy numbers: ")
for i in range(1, max):
if checkSpy(i):
print(i, end=" ")
```

```
Enter the upper bound to find spy numbers: 1500
Spy numbers:
1 2 3 4 5 6 7 8 9 22 123 132 213 231 312 321 1124 1142 1214 1241 1412 1421
```

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