What would Python return when following expressions are evaluated

Q. What would Python return when following expressions are evaluated? As earlier, first evaluate these expressions on paper and then verify by writing them in Python shell.

Given:

a = "hello"

b = 15

c = 20

d = "12"

 

 
	 
 
	 
Expression
 
	 
Your Result
 
	 
Result in Python Shell
 
 
 
	 
1.
 
	 
str(b) + str(c) + d + a
 
	 
 
	 
 
 
 
	 
2.
 
	 
d + 10
 
	 
 
	 
 
 
 
	 
3.
 
	 
d * 3
 
	 
 
	 
 
 
 
	 
4.
 
	 
a + int(d)
 
	 
 
	 
 
 

Answer :-

 
	 
 
	 
Expression
 
	 
Your Result
 
	 
Result in Python Shell
 
 
 
	 
1.
 
	 
str(b) + str(c) + d + a
 
	 
152012hello
 
	 
'152012hello'
 
 
 
	 
2.
 
	 
d + 10
 
	 
Error
 
	 
Error because integer and string cannot add in python
 
 
 
	 
3.
 
	 
d * 3
 
	 
121212
 
	 
'121212'
 
 
 
	 
4.
 
	 
a + int(d)
 
	 
Error
 
	 
Error because integer and string cannot add in python