python - 如何在 while 循环中连接字符串？

Question

所以我正在努力做到这一点，这样我就可以输入多个字符串，它会连接所有的字符串。但每次它只返回一个字符串而不添加它们。

def addWords():
    s = 'a'
    while s != '':
        s = input( ' I will echo your input until you enter return only: ')
        return(s)
        a = a + s
        return (a)

Answer 1

这是我假设您正在尝试做的事情:

def add_words():
    a = ''
    s = 'a'
    while s != '':
        s = input("I will echo your input until you enter return only: ")
        a += s # equivalent to a = a + s
    # we exit the code block when they enter the empty string
    return a

但实际上你应该这样做:

def add_words():
    accumulator = ''
    while True:  # loop forever
        s = input("I will echo your input until you enter return only: ")
        if not s:  # if s is the empty string...
            break  # leave the infinite loop
        accumulator += s
    return accumulator

当您学习 itertools 魔法时，您可以制作一些东西(公认的丑陋)，例如...

def add_words():
    return "".join(iter(lambda: input("I will echo your input until you enter return only: "), ''))