Python中有一个字符串'i am a student. you are a teacher.'

你可以使用Python的字符串方法来对这个字符串进行各种操作，例如：

# 将字符串转换为大写
string = 'i am a student. you are a teacher.'
print(string.upper())  # 输出：I AM A STUDENT. YOU ARE A TEACHER.

# 将字符串转换为小写
print(string.lower())  # 输出：i am a student. you are a teacher.

# 将字符串的每个单词的首字母大写
print(string.title())  # 输出：I Am A Student. You Are A Teacher.

# 将字符串中的'.'替换为','
print(string.replace('.', ','))  # 输出：i am a student, you are a teacher.

# 将字符串按空格分割成列表
print(string.split())  # 输出：['i', 'am', 'a', 'student.', 'you', 'are', 'a', 'teacher.']

此外，Python还提供了很多其他的字符串方法，可以根据实际需求进行使用。

相关问题

Python中有一个字符串'i am a student. you are a teacher.'编程将字符串中的每条语句的第一个单词首字母改写为大写，并输出字符数最多的那条语句

代码如下：

s = 'i am a student. you are a teacher.'
sentences = s.split('. ') # 以'. '为分隔符将字符串分割成句子列表
max_len = 0 # 最长的句子长度
max_sentence = '' # 最长的句子

for sentence in sentences:
    words = sentence.split(' ') # 以空格为分隔符将句子分割成单词列表
    words[0] = words[0].capitalize() # 将第一个单词首字母大写
    new_sentence = ' '.join(words) # 将单词列表合并成句子
    if len(new_sentence) > max_len: # 更新最长的句子
        max_len = len(new_sentence)
        max_sentence = new_sentence

print(max_sentence) # 输出最长的句子

输出结果：

You are a teacher.

有一个字符串： words="i am a student. you are a teacher. he is a worker. she is a nurse. we are all chinese.",用python 编程将该字符串中每条语句的第一个单词首字母改为大写字母，并输出字符数最多的那 条语句。

代码如下：

words="i am a student. you are a teacher. he is a worker. she is a nurse. we  are all chinese."
sentences = words.split(". ") # 按照句号和空格分割字符串，得到每条语句

max_len = 0 # 记录最大长度
result = "" # 记录字符数最多的那条语句

for sentence in sentences:
    words = sentence.split() # 按照空格分割单词
    if len(words) > 0:
        words[0] = words[0].capitalize() # 将第一个单词首字母改为大写字母
        new_sentence = " ".join(words) + "." # 将单词重新拼接成语句
        if len(new_sentence) > max_len: # 更新字符数最多的那条语句
            max_len = len(new_sentence)
            result = new_sentence

print(result)

输出结果为：

We are all chinese.