检查python中的字符串中是否存在所有子字符串

def check_substrings(string):
    substrings = []
    for i in range(len(string)):
        for j in range(i+1, len(string)+1):
            substrings.append(string[i:j])
    
    for substring in substrings:
        if substring not in string:
            return False
    
    return True

string = "abcde"
result = check_substrings(string)
print(result)

def check_substrings(string):
    substrings = set()
    for i in range(len(string)):
        for j in range(i+1, len(string)+1):
            substrings.add(string[i:j])
    
    return substrings == set(string)