Write a function letter2number() that takes a string representing a letter grade

Question

Write a function letter2number() that takes a string representing a letter grade as a parameter and returnsthe grade point associated with that grade.The grade letter will be one of A, B, C, D, or F (upper-or lowercase).It may include a plus or minus after the letter.An A corresponds to a grade point of 4, a B to 3, a C to 2, a D to 1, and an F to 0.A plus increases the base grade point by 0.3 and a minus decreases it by 0.3.There is no such thing as an A+ or an F-.If the user provides a string as an argument that doesn't correspond to a valid grade, the function returns the string 'unknown grade'.You MUST use a dictionaryfor this problem.Any solution that does not involve a dictionary will not earn full credit.The following shows the function as used on several different arguments:

Python 3.4.1 Shell File Edit Shell Debug Optionsindows Help etter2Number ('A 3.7 2.3 >>letter2Number'f') >>letter2Number E') tter2Nurber ('E) unknown grade Ln: 58 Col: 4

Explanation / Answer

grades={‘A’:4,’B’:3,’C’:2,’D’:1}

letter2number(‘A’)

if you enter

letter2number(‘F-‘)

It will show unknown

you can use

else if ‘+’ in grade:

grade+=3;

error;

else if if ‘-’ in grade:

grade-=3;

error;

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