Python：如何使用while循环并输出正确的单词con

Question

到目前为止，我得到的是：

while len(words) != 5:
        words = raw_input("Enter a 5 worded sentence: ").split()
        print "Try again. The word count is:", wordCount
if len(words) == 5:
        print "Good! The word count is 5!" 

问题是我明白了：

^{pr2}$

当我输入多于或少于5个单词时，它会保持该单词的计数，并且不会更改。

Answer 1

因为Python不像其他语言那样有do-while循环，所以这个习惯用法可以防止raw_input函数的重复，并确保循环至少运行一次。确保在获得新输入后更新word_count。在

while 1:
    words = raw_input("Enter a 5 worded sentence: ").split()
    word_count = len(words)
    if word_count == 5: break
    print "Try again. The word count is:", word_count
print "Good! The word count is 5!"

Answer 2

你需要重新整理一下你的逻辑：

# prompt before entering loop
words = raw_input("Enter a 5 worded sentence: ").split()
while len(words) != 5:
        print "Try again. The word count is:", len(words)
        words = raw_input("Enter a 5 worded sentence: ").split()

# no need to test len again
print "Good! The word count is 5!" 

Answer 3

接受输入后，应在循环内更新变量wordCount。只有这样，它才会反映出新的价值观。有点像这：在

while len(words) != 5:
    words = raw_input("Enter a 5 worded sentence: ").split()
    wordCount = len(words)
    print "Try again. The word count is:", wordCount
if len(words) == 5:
    print "Good! The word count is 5!"