Python中有两个简单的if-else代码，难道它们不返回相同的值吗？为什么每个人都返回其他东西。

def letter_check(word,letter):
  for i in word:
    if i == letter:
      return True
  return False

# This returns True    
print(letter_check("strawberry","a"))

# Same function?
def letter_check(word,letter):
  for i in word:
    if i == letter:
      return True
    else:
      return False

# This returns False    
print(letter_check("strawberry","a"))