# 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 of a given list of numbers.

**Sample Solution:**

**Python Code:**

```
def test(lst):
previous_digit = 0
ctr = 0
for digit in lst:
if previous_digit==0 and digit!=0:
ctr+=1
previous_digit = digit
return ctr
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("\nOriginal list:")
print(nums)
print("\nNumber of groups of non-zero numbers separated by zeros of the said list:")
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:**

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**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.

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## Python: Tips of the Day

**Big Number Readability:**

you can separate zeros with underscore (_)

print(2_000_000) print(2_000_000 +1)

Output:

2000000 2000001

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