﻿ Pandas Data Series: Compute difference of differences between consecutive numbers of a given series - w3resource

# Python Pandas: Compute difference of differences between consecutive numbers of a given series

## Python Pandas: Data Series Exercise-26 with Solution

Write a Pandas program to compute difference of differences between consecutive numbers of a given series.

Sample Solution :

Python Code :

``````import pandas as pd
series1 = pd.Series([1, 3, 5, 8, 10, 11, 15])
print("Original Series:")
print(series1)
print("\nDifference of differences between consecutive numbers of the said series:")
print(series1.diff().tolist())
print(series1.diff().diff().tolist())
``````

Sample Output:

```Original Series:
0     1
1     3
2     5
3     8
4    10
5    11
6    15
dtype: int64

Difference of differences between consecutive numbers of the said series:
[nan, 2.0, 2.0, 3.0, 2.0, 1.0, 4.0]
[nan, nan, 0.0, 1.0, -1.0, -1.0, 3.0]
```

Python Code Editor:

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## Python: Tips of the Day

Python: Cache results with decorators

There is a great way to cache functions with decorators in Python. Caching will help save time and precious resources when there is an expensive function at hand.

Implementation is easy, just import lru_cache from functools library and decorate your function using @lru_cache.

```from functools import lru_cache

@lru_cache(maxsize=None)
def fibo(a):
if a <= 1:
return a
else:
return fibo(a-1) + fibo(a-2)

for i in range(20):
print(fibo(i), end="|")

print("\n\n", fibo.cache_info())
```

Output:

```0|1|1|2|3|5|8|13|21|34|55|89|144|233|377|610|987|1597|2584|4181|

CacheInfo(hits=36, misses=20, maxsize=None, currsize=20)```