Break and explain function codes . ......................................................................................

 def checkio(text): 
         return (lambda x: max(x, key=x.count))(sorted([i for i in text.lower() if i.isalpha()]))

1. Can someone break this into normal form pls?

2. What are these parentheses mean (........ )(.........)?

I already know the output of this program just that I don't know how this works.

Thank You.

CodePudding user response：

With the (...)(...) you define and immediately call a lambda and pass it the sorted list as the parameter x. The first (...) is for operator precedence (call the lambda, not the result of max), the second (...) is regular function call syntax. It's clearer if you move the lambda to a separate line:

def checkio(text):
    f = lambda x: max(x, key=x.count)
    return f(sorted([i for i in text.lower() if i.isalpha()]))

It's even more clearer, if you drop the lambda and instead just define the list as x and call max directly. Also, no need to sort the list.

def checkio(text):
    x = [i for i in text.lower() if i.isalpha()]
    return max(x, key=x.count)

This is still pretty inefficient, though, as the repeated calls to count make it O(n²). Better use collections.Counter to count all at once, then get the most_common element.

from collections import Counter
def checkio(text):
    return Counter(i for i in text.lower() if i.isalpha()).most_common(1)[0][0]

CodePudding user response：

well this function is giving the alphabet character having maximum occuerance.

so insort this function is like this

def checkio(text):

    if len(text) == 0:
          return None

    def get_alphabets(text):
        return [char for char in text.lower() if char.isapha()]

    def get_most_frequent(array):
        result = {}
        for char in array:
            if char not in result:
                 result[char] = 0
            result[char]  = 1
        max_occu = max(result.values)
        max_occurernce_char = [ char for char, value in result.items() if value == max_occu]
        returm max_occuerence_char
    
    clean_alphabets_in_lower = get_alphabets(text)
    max_occuernce_chars = get_most_frequent(clean_alphabets_in_lower)
    
    return max_occuernce_chars