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我是python（第2天）的新手，正在解决一个问题，要求我编写一个读取ASCII文件的程序（要求文件名作为输入），检查它是否有两个以上的单词并打印出前两个单词屏幕上的文件。

它有点模糊，但我会假设文件都是 str，用空格分隔。

前任。

text1 text2 text text text

到目前为止，我有：

name = (raw_input("Please enter the name of the file: "))
f=open(name)
with codecs.open(name, encoding='utf-8') as f:
    for line in f:
        line = line.lstrip(BOM)
words=line.split()
print words
if len(words) > 2:
    print 'There are more than two words'
    firsttow = words[:2]
    print firstrow

我在编写 else 语句时遇到问题，我想要，

if len(words) > 2:
    print 'There are more than two words'
    firsttow = words[:2]
print firstrow
else: 
if len(words) <2:
        print 'There are under 2 words, no words will be shown'

应该如何添加它，还有其他方法可以改进我的代码来解决这个问题吗？我非常感谢您的帮助

提前致谢

*编辑：感谢所有帮助，我遇到的最后一个问题是当我运行 .py 文件时，我希望能够在 cmd 窗口关闭之前看到结果。

添加：raw_input("Press return to close this window...")不起作用，它会立即关闭。有任何想法吗？

Edit2* 这是我当前的代码，仍在尝试打开 cmd 窗口

import codecs
BOM = codecs.BOM_UTF8.decode('utf8')
name = (raw_input("Please enter the name of the file: "))

with codecs.open(name, encoding='utf-8') as f:
    words=[]            #define words here
    for line in f:
        line = line.lstrip(BOM)
        words.extend(line.split())        #append words from each line to words  

if len(words) > 2:
    print 'There are more than two words'
    firstrow = words[:2]
    print firstrow                #indentation problem here
elif len(words) <2:                    #use if
    print 'There are under 2 words, no words will be shown'

raw_input("Press return to close this window...")
4

2 回答 2

1

该代码应写为：

if len(words) > 2:
    print 'There are more than two words'
    firsttow = words[:2]
    print firstrow
elif len(words) <2:
    print 'There are under 2 words, no words will be shown'

注意缩进和使用elif（意思是“else if”）。

于 2012-09-24T16:02:01.810 回答
0 
with codecs.open(name, encoding='utf-8') as f:
    words=[]            #define words here
    for line in f:
        line = line.lstrip(BOM)
        words.extend(line.split())        #append words from each line to words      

if len(words) > 2:
    print 'There are more than two words'
    firsttow = words[:2]
    print firstrow                #indentation problem here
if len(words) <2:                    #use if
    print 'There are under 2 words, no words will be shown'
于 2012-09-24T16:06:22.450 回答