s=" Python is beautiful!" print( s[0:7[].lower)的运行结果是什么

这段代码有语法错误，请修改为以下代码：

s = "Python is beautiful!"
print(s[0:7].lower())

运行结果为：

python

这是因为 `s[0:7]` 表示取字符串 `s` 的第0个到第6个字符（不包括第7个），即 `"Python "`，然后 `.lower()` 表示将这个字符串转化为小写字母，即 `"python "`。注意字符串末尾的空格也会被保留。

相关问题

编程实现：编程实现英文词频统计： 文件words.txt内容如下所示： Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. 读取文件中内容，要求统计文件中英文单词的个数，输出单词及出现次数。

以下是Python代码实现：

import re

# 读取文件内容
with open('words.txt', 'r') as f:
    text = f.read()

# 将所有非字母字符替换为空格
text = re.sub(r'[^a-zA-Z]', ' ', text)

# 将所有单词转换为小写
text = text.lower()

# 将文本分割成单词列表
words = text.split()

# 统计单词出现次数
word_count = {}
for word in words:
    if word in word_count:
        word_count[word] += 1
    else:
        word_count[word] = 1

# 输出单词及出现次数
for word, count in word_count.items():
    print(f'{word}: {count}')

运行结果：

beautiful: 1
is: 4
better: 4
than: 4
ugly: 1
explicit: 1
implicit: 1
simple: 1
complex: 2
complicated: 1

其中，`words.txt` 文件内容为：

Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated.

词捚统计是文本分析中捘常使用到的一个功能，请编写一个函挻：统计一段话中出现捚率捘大的单词以及它出现的次挻。哨给捙内容为： Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense.

下面是一个Python函数，可以统计一段话中出现频率最高的单词以及它出现的次数：

def count_words(text):
    # 将文本转换为小写并分割成单词
    words = text.lower().split()
    # 统计每个单词出现的次数
    word_counts = {}
    for word in words:
        if word in word_counts:
            word_counts[word] += 1
        else:
            word_counts[word] = 1
    # 找到出现次数最多的单词
    max_count = 0
    max_word = ''
    for word, count in word_counts.items():
        if count > max_count:
            max_count = count
            max_word = word
    # 返回结果
    return max_word, max_count

# 测试
text = 'Beautiful is better than ugly. Explicit is better than implicit. Simple is better than complex. Complex is better than complicated. Flat is better than nested. Sparse is better than dense.'
word, count = count_words(text)
print(f'The most frequent word is "{word}" which appears {count} times.') 

输出结果为：

The most frequent word is "better" which appears 6 times.

注意，这个函数只是一个简单的示例，实际上在文本分析中需要考虑很多其他因素，例如停用词、词干提取等等。