course="Python Programming"
score=95.5
sentence=f"{course}课程的成绩是{score}分"
print(sentence)
print(type(score))
 
course_under=course.replace(" ","_")
print(course_under)
count_o=course.count('o')
print("字母o出现的次数:",count_o)
 
words=["python","ai","machine learning","data","nlp"]
longest=words[0]
for w in words:
  if len(w)>len(longest):
     longest=w
print(f'最长的字符串是"{longest}",长度为{len(longest)}')

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