在Python循环中使用return语句

Question

def has_a_vowel(a_str):
    for letter in a_str:
        if letter in "aeiou":
            return True
        else:
            return False
    print("Done!")

调用此函数只会检查第一个元素。。。如何让它在返回True或False之前遍历字符串？ 谢谢

Answer 1

最好将else: return False和return False从循环外移除：

def has_a_vowel(a_str):
    for letter in a_str:
        if letter in "aeiou":
            return True    # this leaves the function

    print("Done!")     # this prints only if no aeiou is in the string
    return False       # this leaves the function only after the full string was checked

或更简单：

def has_a_vowel(a_str): 
    return any(x in "aeiou" for x in a_str)

（但不会打印完成）。你知道吗

读数：

• How exactly does the python any() function work?
• any()