Скачать или смотреть int() function and more about variables

This video covers int() function and more about variables. Must watch it and also watch previous videos to make it more clear. Source codes are given below:-

#int() function
#How to take more than one variables in a single line...???
num_1=input("ENter 1st no.\n")
Enter 1st no.
4
num_2=input("Enter 2nd no.\n")
Enter 2nd no.
4
total=num_1+num_2
print("Total is "+total)
Total is 44
"4"
num_1=int(input("Enter 1st no.\n"))
Enter 1st no.
4
num_2=int(input("Enter 2nd no.\n"))
Enter 2nd no.
4
total=num_1+num_2
print("Total is "+total)
Traceback (most recent call last):
File "pyshell10", line 1, in module
print("Total is "+total)
TypeError: can only concatenate str (not "int") to str
print("Total is "+str(total))
Total is 8
num1=str(4)
num2=float("44")
num3=int("33")
print(num2+num3)
77.0
name,age="Divya",20
print("Hello "+name+" Your age is "+age)
Traceback (most recent call last):
File "pyshell17", line 1, in module
print("Hello "+name+" Your age is "+age)
TypeError: can only concatenate str (not "int") to str
print("Hello "+name+" Your age is "+str(age))
Hello Divya Your age is 20
print(total)
8
x=y=z=1
print(x+y+z)
3

Codes are given above with all errors and corrections...

Thank you...!!!