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Python: Check whether a given string has a capital letter, a lower case letter, a number and specified length using lambda

Python Lambda: Exercise-33 with Solution

Write a Python program to check whether a given string contains a capital letter, a lower case letter, a number and a minimum length using lambda.

Sample Solution:

Python Code :

def check_string(str1):
    messg = [
    lambda str1: any(x.isupper() for x in str1) or 'String must have 1 upper case character.',
    lambda str1: any(x.islower() for x in str1) or 'String must have 1 lower case character.',
    lambda str1: any(x.isdigit() for x in str1) or 'String must have 1 number.',
    lambda str1: len(str1) >= 7                 or 'String length should be atleast 8.',]
    result = [x for x in [i(str1) for i in messg] if x != True]
    if not result:
        result.append('Valid string.')
    return result    
s = input("Input the string: ")
print(check_string(s))

Sample Output:

Input the string:  W3resource
['Valid string.']

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Next: Write a Python program to filter the height and width of students, which are stored in a dictionary using lambda.

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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)