def count_letters(word):
"""
统计单词中每个字母出现的次数
:param word: 待统计的单词
:return: 包含每个字母出现次数的字典
"""
letter_count = {}
for letter in word:
if letter in letter_count:
letter_count[letter] += 1
else:
letter_count[letter] = 1
return letter_count
# 测试
word = "hello"
print(count_letters(word)) # {'h': 1, 'e': 1, 'l': 2, 'o': 1}