Pandas: Convert all the string values to upper, lower cases in a given pandas series and also find the length of the string values
Pandas: String and Regular Expression Exercise-1 with Solution
Write a Pandas program to convert all the string values to upper, lower cases in a given pandas series. Also find the length of the string values.
Sample Solution:
Python Code :
import pandas as pd
import numpy as np
s = pd.Series(['X', 'Y', 'Z', 'Aaba', 'Baca', np.nan, 'CABA', None, 'bird', 'horse', 'dog'])
print("Original series:")
print(s)
print("\nConvert all string values of the said Series to upper case:")
print(s.str.upper())
print("\nConvert all string values of the said Series to lower case:")
print(s.str.lower())
print("\nLength of the string values of the said Series:")
print(s.str.len())
Sample Output:
Original series: 0 X 1 Y 2 Z 3 Aaba 4 Baca 5 NaN 6 CABA 7 None 8 bird 9 horse 10 dog dtype: object Convert all string values of the said Series to upper case: 0 X 1 Y 2 Z 3 AABA 4 BACA 5 NaN 6 CABA 7 None 8 BIRD 9 HORSE 10 DOG dtype: object Convert all string values of the said Series to lower case: 0 x 1 y 2 z 3 aaba 4 baca 5 NaN 6 caba 7 None 8 bird 9 horse 10 dog dtype: object Length of the string values of the said Series: 0 1.0 1 1.0 2 1.0 3 4.0 4 4.0 5 NaN 6 4.0 7 NaN 8 4.0 9 5.0 10 3.0 dtype: float64
Python Code Editor:
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Next: Write a Pandas program to remove whitespaces, left sided whitespaces and right sided whitespaces of the string values of a given pandas series.
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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)
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