Can't tell where my variables went, "missing positional arguments"-CodePudding

I started learning python a few months back, so i don't know alot of terms still.

This program fetches co-ordinates from a text file and finds out which point is closest to the user input. the co-ordinates are listed lat,lon,cityname

of course i'm suprised that it can't find the variables, but i'm even more suprised that it found one but not the others.

I would be greatful if someone could explain to me why it can't find them.

points=open_points.read()
text_length_unfilt=len(points)
text_lenth=text_length_unfilt/3
cit_point = points.split(",")

#importing all of the items from math now
from math import radians
from math import atan2
from math import cos
from math import sin
from math import sqrt


#this allows the user to imput two numbers, one for lat, one for lon.
lat1=float(input("What is the Latatude of your point in degrees? "))
lon1=float(input("That's great. Now in degrees, what is the Longitude? "))


#function to reduce clutter

def calc_dist(lat1,lon1,lat2,lon2):
    #this part converts the degrees into radians for the equation
    lon1 = radians(lon1)
    lat1 = radians(lat1)
    lon2 = radians(lon2)
    lat2 = radians(lat2)

    #here i'm just using the equation from the rubrik
    a = sin((lat1 - lat2) / 2) ** 2   cos(lat1) * cos(lat2) * sin((lon1 - lon2) / 2) ** 2
    c = 2 * atan2(sqrt(a), sqrt(1 - a))
    distance = 3958.8 * c
    return(distance)

and this is the error i get.

cit_dist=calc_dist((lat1, lon1, lat2, lon2))
TypeError: calc_dist() missing 3 required positional arguments: 'lon1', 'lat2', and 'lon2'

CodePudding user response：

cit_dist=calc_dist((lat1, lon1, lat2, lon2))

The error is because you are using double parentheses. (lat1, lon1, lat2, lon2) is treated as a single tuple.