course = "Python Programming"
# 将空格替换为下划线
course_under = course.replace (" ", "_")
print(course_under)
# 统计字母'o'出现的次数
count_o = course.count('o')
print("字母o出现的次数:", count_o)# your code goes here
Y291cnNlID0gIlB5dGhvbiBQcm9ncmFtbWluZyIKIyDlsIbnqbrmoLzmm7/mjaLkuLrkuIvliJLnur8KY291cnNlX3VuZGVyID0gY291cnNlLnJlcGxhY2UgKCIgIiwgIl8iKQpwcmludChjb3Vyc2VfdW5kZXIpCgojIOe7n+iuoeWtl+avjSdvJ+WHuueOsOeahOasoeaVsApjb3VudF9vID0gY291cnNlLmNvdW50KCdvJykKcHJpbnQoIuWtl+avjW/lh7rnjrDnmoTmrKHmlbDvvJoiLCBjb3VudF9vKSMgeW91ciBjb2RlIGdvZXMgaGVyZQ==