﻿ Python: Count number of lists in a given list of lists - w3resource

# Python: Count number of lists in a given list of lists

## Python List: Exercise - 90 with Solution

Write a Python program to count the number of lists in a given list of lists.

Sample Solution:

Python Code:

``````def count_list(input_list):
return len(input_list)

list1 = [[1, 3], [5, 7], [9, 11], [13, 15, 17]]
list2 = [[2, 4], [[6,8], [4,5,8]], [10, 12, 14]]
print("Original list:")
print(list1)
print("\nNumber of lists in said list of lists:")
print(count_list(list1))
print("\nOriginal list:")
print(list2)
print("\nNumber of lists in said list of lists:")
print(count_list(list2))
```
```

Sample Output:

```Original list:
[[1, 3], [5, 7], [9, 11], [13, 15, 17]]

Number of lists in said list of lists:
4

Original list:
[[2, 4], [[6, 8], [4, 5, 8]], [10, 12, 14]]

Number of lists in said list of lists:
3
```

Pictorial Presentation: Flowchart: ## Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Python Code Editor:

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﻿

## Python: Tips of the Day

Given a predicate function, fn, and a prop string, this curried function will then take an object to inspect by calling the property and passing it to the predicate:

Example:

```def tips_check_prop(fn, prop):
return lambda obj: fn(obj[prop])
check_age = tips_check_prop(lambda x: x >= 25, 'age')
user = {'name': 'Owen', 'age': 25}

print(check_age(user))
```

Output:

```True
```

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