# Python: Count the number of groups of non-zero numbers separated by zeros of a given list of numbers

## Python List: Exercise - 209 with Solution

Write a Python program to count the number of groups of non-zero numbers separated by zeros in a given list of numbers.

**Sample Solution:**

**Python Code:**

```
# Define a function 'test' that counts the number of groups of non-zero numbers separated by zeros in a list.
def test(lst):
# Initialize variables 'previous_digit' to store the previous digit and 'ctr' to count the groups.
previous_digit = 0
ctr = 0
# Iterate through the elements in the input list 'lst'.
for digit in lst:
# Check if the previous digit was zero and the current digit is non-zero.
if previous_digit == 0 and digit != 0:
# Increment the group count.
ctr += 1
# Update the 'previous_digit' for the next iteration.
previous_digit = digit
return ctr
# Define a list of numbers 'nums'.
nums = [3, 4, 6, 2, 0, 0, 0, 0, 0, 0, 6, 7, 6, 9, 10, 0, 0, 0, 0, 0, 5, 9, 9, 7, 4, 4, 0, 0, 0, 0, 0, 0, 5, 3, 2, 9, 7, 1]
# Print a message indicating the original list.
print("\nOriginal list:")
# Print the original list of numbers 'nums'.
print(nums)
# Print a message indicating the purpose of the following lines of code.
print("\nNumber of groups of non-zero numbers separated by zeros of the said list:")
# Call the 'test' function to count the groups of non-zero numbers separated by zeros in 'nums' and print the result.
print(test(nums))
```

Sample Output:

Original list: [3, 4, 6, 2, 0, 0, 0, 0, 0, 0, 6, 7, 6, 9, 10, 0, 0, 0, 0, 0, 5, 9, 9, 7, 4, 4, 0, 0, 0, 0, 0, 0, 5, 3, 2, 9, 7, 1] Number of groups of non-zero numbers separated by zeros of the said list: 4

**Flowchart:**

**Python Code Editor:**

**Previous:** Sum a list of numbers. Write a Python program to sum the first number with the second and divide it by 2, then sum the second with the third and divide by 2, and so on.

**Next:** Write a Python program to compute the sum of non-zero groups (separated by zeros) of a given list of numbers.

**What is the difficulty level of this exercise?**

Test your Programming skills with w3resource's quiz.

**Weekly Trends**- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join