Mahir freeCodeCamp • learn-list-comprehension-by-building-a-case-converter-program

Step 21: Still, the final result is not exactly what...

Ringkasan Tantangan

Still, the final result is not exactly what you want to achieve. You need to execute a different expression for the characters filtered out by the `if` clause. You'll use an `else` clause for that:

Still, the final result is not exactly what you want to achieve. You need to execute a different expression for the characters filtered out by the if clause. You’ll use an else clause for that:

spam = [i * 2 if i > 0 else -1 for i in iterable]

Note that, differently from the if clause, the if/else construct must be placed between the expression and the for keyword.

Modify your list comprehension so that when a character is not uppercase it remains unchanged.

💡 Lihat Solusi

def convert_to_snake_case(pascal_or_camel_cased_string):
    # snake_cased_char_list = []
    # for char in pascal_or_camel_cased_string:
    #     if char.isupper():
    #         converted_character = '_' + char.lower()
    #         snake_cased_char_list.append(converted_character)
    #     else:
    #         snake_cased_char_list.append(char)
    # snake_cased_string = ''.join(snake_cased_char_list)
    # clean_snake_cased_string = snake_cased_string.strip('_')

    # return clean_snake_cased_string
    snake_cased_char_list = [
        '_' + char.lower() if char.isupper()
        else char
        for char in pascal_or_camel_cased_string
    ]
    return ''.join(snake_cased_char_list).strip('_')

def main():
    print(convert_to_snake_case('aLongAndComplexString'))

main()