app.py

#import definitions
import pandas as pd
import streamlit as st

df = pd.read_csv('Map-City-State-Zip-Lat-Long.txt', dtype=str, sep=';') 
st.title("Input a city or zip code and we will take you there!")

city_name = st.text_input("Please search for a city:")
lat = df[df["City"] == city_name]["Latitude"].values[0]
lon = df[df["City"] == city_name]["Longitude"].values[0]
city_list = []
lat_list = []
long_list = []



st.write(lat)

if city_name != "":
    city_list.append(city_name)
    lat_list.append(lat)
    long_list.append(lon)
    st.map(pd.DataFrame({'cities' : city_list, 'lat' : lat_list, 'lon' : long_list}))
    st.write(city_name, "is located at: ", lat, ",", lon)