python算平均成绩_用Python计算平均成绩？

我想得到两个及格分数的平均分。输出应为：0.0，如果两个成绩都不及格<；50

如果只有一个成绩是及格分数(如果

一个大于50)

两个等级的平均值，如果两个等级都通过(如果两者都通过

大于50)

以下是我目前为止的代码：def passing_grade(grade1,grade2):

'''(number, number)--> number

This function definition prints the average of all passing grade(s)

'''

# Function 1 - If both numbers are outside the grading range (0-100)

if 0.0 < grade1 > 100.0 and 0 < grade2 > 100.0:

print ('Not available grading')

elif 0.0 >= grade1 <= 50.0 and 0.0 >= grade2 <= 50.0:

print (0.0)

#Function 2 - If one of the grades is passing then, print passing grade

elif 0.0 >= grade1 <= 50.0 and 0.0 >= grade2 >= 50.0:

print (grade2)

elif 0.0 >= grade1 >= 50.0 and 0.0 >= grade2 <= 50.0:

print (grade1)

#Function 3 - If both grades are passing >50 then print the average

elif 50.0 > grade1 <= 100.0 and 50.0> grade2 <= 100.0:

print ((grade1+grade2)/2)

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