#1.1
course="Python programming"
score=95.5
sentence=f"{course}课程的成绩是{score}分"
print(sentence)
print(type(score))
#1.2
course_under=course.replace(" ","_")
print(course_under)
count_o=course.count('o')
print("字母o出现的次数:",count_o)
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