How to count the number of repeated characters in a string in Python

repeatedchar.py

sentence = "This is a common interview question"


def most_repeated_char(sentence):
    character_freq = {}
    for char in sentence:
        if char in character_freq:
            character_freq[char] += 1
        else:
            character_freq[char] = 1

    char_freq_sorted = sorted(character_freq.items(), key=lambda keyval: keyval[1], reverse=True)
    return char_freq_sorted[0]

print(most_repeated_char(sentence))