How to work with Values entered through Tkinter entry widgets - python-3.x

Question

I'm creating this program to calculate the weight of animals in a camp, by getting the amount of animals of each age and then get the total amount of food they need daily.
I'm using Tkinter for the GUI where the amount of animals of each age is entered.
When i run the program the program doesn't retrieve the values that where entered and doesn't work with them?
I am completely new to Tkinter and fairly new to Python 3.6
I would be extremely grateful for any constructive criticism.
#Beginning
from tkinter import *
from math import *
import string
root = Tk()
#Function to calculate everything- Gets total weight of animals and then calculates feed
def enter_click(event):
global SabCow, SabBull, BuffBull, BuffCow, RoanCow, RoanBull, Six_Months,
One_Year, Two_Year, Three_Year, Big
M1_int = IntVar(M1.get())
M2_int = IntVar(M2.get())
M3_int = IntVar(M3.get())
M4_int = IntVar(M4.get())
M5_int = IntVar(M5.get())
F1_int = IntVar(F1.get())
F2_int = IntVar(F2.get())
F3_int = IntVar(F3.get())
F4_int = IntVar(F4.get())
F5_int = IntVar(F5.get())
#Work with which animal is selected form radiobutton, then calculate what is the weight of animals of each age then calculate food necessary
if A.get() == 1 :
f1_weight = F1_int * ((SabCow * 25)/Six_Months)
f2_weight = F2_int * ((SabCow * 40)/One_Year)
f3_weight = F3_int * ((SabCow * 70)/Two_Year)
f4_weight = F4_int * ((SabCow * 85)/Three_Year)
f5_weight = F5_int * SabCow
m1_weight = M1_int * ((SabBull * 25)/Six_Months)
m2_weight = M2_int * ((SabBull * 40)/One_Year)
m3_weight = M3_int * ((SabBull * 70)/Two_Year)
m4_weight = M4_int * ((SabBull * 85)/Three_Year)
m5_weight = M5_int * SabBull
Weight_Female = lambda f1_weight, f2_weight, f3_weight, f4_weight, f5_weight : f1_weight + f2_weight + f3_weight + f4_weight + f5_weight
Weight_Male = m1_weight + m2_weight + m3_weight + m4_weight + m5_weight
Total_Weight = Weight_Female + Weight_Male
Total_Food = Total_Weight * Big
animal = "Sable"
result_text = animal, "\nTotalFood Requierd: ", Total_Food, "\n", Total_Weight, "\n", Weight_Female, "\n", Weight_Male
return result_text
elif A.get() == 2 :
f1_weight = F1_int * ((BuffCow * 25)/Six_Months)
f2_weight = F2_int * ((BuffCow * 40)/One_Year)
f3_weight = F3_int * ((BuffCow * 70)/Two_Year)
f4_weight = F4_int * ((BuffCow * 85)/Three_Year)
f5_weight = F5_int * SabCow
m1_weight = M1_int * ((BuffBull * 25)/Six_Months)
m2_weight = M2_int * ((BuffBull * 40)/One_Year)
m3_weight = M3_int * ((BuffBull * 70)/Two_Year)
m4_weight = M4_int * ((BuffBull * 85)/Three_Year)
m5_weight = M5_int * BuffBull
Weight_Female = f1_weight + f2_weight + f3_weight + f4_weight + f5_weight
Weight_Male = m1_weight + m2_weight + m3_weight + m4_weight + m5_weight
Total_Weight = Weight_Female + Weight_Male
Total_Food = Total_Weight * Big
animal = "Buffalo"
result_text = animal, "\nTotalFood Requierd: ", Total_Food, "\n", Total_Weight, "\n", Weight_Female, "\n", Weight_Male
return result_text
elif A.get() == 3 :
f1_weight = F1_int * ((RoanCow * 25)/Six_Months)
f2_weight = F2_int * ((RoanCow * 40)/One_Year)
f3_weight = F3_int * ((RoanCow * 70)/Two_Year)
f4_weight = F4_int * ((RoanCow * 85)/Three_Year)
f5_weight = F5_int * RoanCow
m1_weight = M1_int * ((RoanBull * 25)/Six_Months)
m2_weight = M2_int * ((RoanBull * 40)/One_Year)
m3_weight = M3_int * ((RoanBull * 70)/Two_Year)
m4_weight = M4_int * ((RoanBull * 85)/Three_Year)
m5_weight = M5_int * RoanBull
Weight_Female = f1_weight + f2_weight + f3_weight + f4_weight + f5_weight
Weight_Male = m1_weight + m2_weight + m3_weight + m4_weight + m5_weight
Total_Weight = Weight_Female + Weight_Male
Total_Food = Total_Weight * Big
animal = "Roan"
result_text = animal, "\nTotalFood Requierd: ", Total_Food, "\n", Total_Weight, "\n", Weight_Female, "\n", Weight_Male
return result_text
print(result_text)
animal = StringVar()
#Animal Weight
BuffBull = 750
BuffCow = 650
SabBull = 230
SabCow = 210
RoanBull = 270
RoanCow = 240
#Animal Ages to Weight
Six_Months = 125
One_Year = 140
Two_Year = 170
Three_Year = 185
#Percentage Food needed of total KG
Big = 2/102
Small = 5/105
#Tkinter
A = IntVar()
A.set(1)
result_text = StringVar()
f1_weight = DoubleVar()
f2_weight = DoubleVar()
f3_weight = DoubleVar()
f4_weight = DoubleVar()
f5_weight = DoubleVar()
m1_weight = DoubleVar()
m2_weight = DoubleVar()
m3_weight = DoubleVar()
m4_weight = DoubleVar()
m5_weight = DoubleVar()
#GUI
w =Label(root, text="Choose an Animal:", justify=LEFT, padx=5,pady=10).grid(row=0)
o =Label(root, text="Results:", justify=LEFT, padx=5, pady=10).grid(row=7)
Label(root, text="Age", padx=5, pady=20).grid(row=0, column=2)
Label(root, text="M", padx=5, pady=20).grid(row=0, column=3)
Label(root, text="F", padx=5, pady=20).grid(row=0, column=4)
Radiobutton(root, text="Sable", padx=20, variable=A, value=1).grid(row=1)
Radiobutton(root, text="Buffalo", padx=20, variable=A, value=2).grid(row=2)
Radiobutton(root, text="Roan", padx=20, variable=A, value=3).grid(row=3)
Label(root, text="6 Months :").grid(row=1, column=2)
Label(root, text="1 Year :").grid(row=2, column=2)
Label(root, text="2 Years :").grid(row=3, column=2)
Label(root, text="3 Years :").grid(row=4, column=2)
Label(root, text="4 Years :").grid(row=5, column=2)
#Entry widgets-to get total of animals of each age
M1 = Entry(root)
M2 = Entry(root)
M3 = Entry(root)
M4 = Entry(root)
M5 = Entry(root)
F1 = Entry(root)
F2 = Entry(root)
F3 = Entry(root)
F4 = Entry(root)
F5 = Entry(root)
M1.grid(row=1, column=3)
M2.grid(row=2, column=3)
M3.grid(row=3, column=3)
M4.grid(row=4, column=3)
M5.grid(row=5, column=3)
F1.grid(row=1, column=4)
F2.grid(row=2, column=4)
F3.grid(row=3, column=4)
F4.grid(row=4, column=4)
F5.grid(row=5, column=4)
#Calculation button and event
enter_button=Button(root, text="Enter")
enter_button.grid(row=6)
enter_button.bind("<Enter>",enter_click)
enter_button.bind("<Return>",enter_click)
root.mainloop()
At this stage I've scouted the internet for 2 weeks with no help and now I also get this error when running the program:
AttributeError: 'str' object has no attribute '_root'

Answer 1

There is a multiple problems in your code.
First:
M1_int = IntVar(M1.get())
Should be like:
M1_int = float(M1.get())
(it is for all variables in M1...F7)
Second: in Weight_Female calculation you doesn't need lambda.
Third:A == 3 is always False. You need to get value form control like in first case (A.get() == 1).