def fileRW(in_f,out_f):
  """
Python fileRW assignment
Andrew Noah Woodlee
ENG 101-06
Due Date: 11-14-19

fileRW(in_f,out_f)
Input:
in_f is the input filename
out_f is the output filename

Function averages data in input file and outputs to output file
"""

  import csv as c
  C1=[]
  C2=[]
  rowdata=[C1,C2]
  with open(in_f,newline='') as in_f2:
    rf=c.reader(in_f2 , delimiter="*")
    Header=True
    for rowdata in rf:
      if Header:
        Head_Data=rowdata
        Header=False
      else:
        C1.append(float(rowdata[0]))
        C2.append(float(rowdata[1]))
  while True:
    uiDataPts=input("How many points do you want me to average: ")
    try:
      uiDataPts=int(uiDataPts)
      if uiDataPts < 0:
        print("Input must be a positve integer, try again.")
        continue
      break
    except ValueError:
      print("Input must be an integer!")
  with open(out_f, 'w', newline='') as outf:
    OData=c.writer(outf, delimiter=",")
    OData.writerow(Head_Data)
    L=len(C1)
    n=int(L/uiDataPts)
    for i in range(0,n):
      avg1=0
      avg2=0
      for j in range(0,uiDataPts):
        avg1+=C1[i*uiDataPts+j]
        avg2+=C2[i*uiDataPts+j]
      avg1/=uiDataPts
      avg2/=uiDataPts
      rout=[str(avg1)]+[str(avg2)]
      OData.writerow(rout)