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plus_scores

Language/Type: Python file input

Write a function named plus_scores that accepts an input file name as a parameter. The input file contains a series of lines that represent student records. Each student record takes up two lines of input. The first line has the student's name and the second line has a series of plus and minus characters. Below is a sample input file: 

Kane, Erica
--+-+
Chandler, Adam
++-+
Martin, Jake
+++++++
Dillon, Amanda
++-++-+-

For each student you should produce a line of output with the student's name followed by a colon followed by the percent of plus characters. For the input above, your function should produce the following output: 

Kane, Erica: 40.0% plus
Chandler, Adam: 75.0% plus
Martin, Jake: 100.0% plus
Dillon, Amanda: 62.5% plus
Function: Write a Python function as described, not a complete program.

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