Example function creation

mammals.py

import math

def CalculateDistance(Lat1, Lon1, Lat2, Lon2):
    Lat1 = float(Lat1)
    Lon1 = float(Lon1)
    Lat2 = float(Lat2)
    Lon2 = float(Lon2)
    
    nDLat = (Lat1 - Lat2) * 0.017453293
    nDLon = (Lon1 - Lon2) * 0.017453293

    Lat1 = Lat1 * 0.017453293
    Lat2 = Lat2 * 0.017453293

    nA = (math.sin(nDLat/2) ** 2) + math.cos(Lat1) * math.cos(Lat2) * (math.sin(nDLon/2) ** 2 )
    nC = 2 * math.atan2(math.sqrt(nA),math.sqrt( 1 - nA ))
    nD = 6372.797 * nC

    return nD

def LocationCount(FileName, Dist, Lat, Long):
    FileIn =open(FileName,"r")
    FileList = []

    # Loop through the lines in the file and generated a nested list
    for Seperate in FileIn:
        Seperate = Seperate.rstrip().split("\t")
        FileList.append(Seperate)
    FileIn.close()

    # Loop through nested list and create variables for name, lat and long
    for Seperate in FileList:
        A= Seperate[0]
        B= Seperate[1]
        C= Seperate[2]
        
        # Ensure these lines are "inside" the "for loop"
        Counter = 0 
        Distance = CalculateDistance(Lat, Long, B,C)
        print(Distance)
        if Dist > Distance:
            Counter +=1 
        print(Counter)

LocationCount("Mammal.txt", 20.0, 50.261667, -5.043333)