python - Read in a file that has multiple grades, each separated by a comma, and prints out the computed average -

question: complete following program, reads in file has multiple grades, each separated comma, , prints out computed average. is, write functions getgrades(): , calculateaverage():

def main():   grades = getgrades()   #get file name containing grades                          #and return contents of file   avg = calculateaverage(grades) #separate grades numbers , compute                          #the average   print("the calculated average is:", avg) main() 

i have inserted given function , wrote new program, little bit confused, getting error. please help!

def getgrades():   filename = input("please enter file name: ")   openfile = open(filename, "r")   readfile = openfile.readlines()    return readfile  def calculateaverage(n):   totalgrades = []    in (n):     split = list(map(int, i.split(",")))     totalgrades += split    avg = sum(totalgrades)/float(len(totalgrades))    return avg  def main():   grades = getgrades()                     avg = calculateaverage(grades)    print("the calculated average is:", avg) main() 

in calculateaverage() function, pass argument n for loop use local variable name readfile of function getgrades().

also, result of split list of strings. convert them integers perform summations can use map(). map returns iterator applies function every item of iterable, yielding results.

to remove newline , other whitespace lines read can use rstrip().

finally, perform floating point division if both arguments integers have transform 1 of 2 float. check answer.

the final program looks this:

def getgrades():   filename = input("please enter file name: ")   openfile = open(filename, "r")   readfile = openfile.readlines()    return readfile  def calculateaverage(n):   total_grades = []   in (n):     line_grade = list(map(int, i.rstrip().split(",")))     total_grades += line_grade   avg = sum(total_grades)/float(len(total_grades))   return avg  def main():   grades = getgrades()                     avg = calculateaverage(grades)    print("the calculated average is:", avg)  if __name__ == "__main__":   main() 

if run test file contents: 5,10,15,20 get:

>>>  please enter file name: test.txt calculated average is: 12.5 >>>  

calculateaverage(n) without map() , list comprehensions be:

def calculateaverage(n):   total_grades = []   in (n):     line_grade = i.rstrip().split(",")     line_grade = [int(x) x in line_grade]     total_grades += line_grade   avg = sum(total_grades)/float(len(total_grades))   return avg 

finally can naive way , have loop converting each element in list returned split integer:

def calculateaverage(n):   total_grades = []   in (n):     line_grade = i.rstrip().split(",")     element in line_grade:       total_grades.append(int(element))   avg = sum(total_grades)/float(len(total_grades))   return avg