List Comprehension: why is this a syntax error?

Question

Why is print(x) here not valid (SyntaxError) in the following list-comprehension?

my_list=[1,2,3] [print(my_item) for my_item in my_list] 

To contrast - the following doesn't give a syntax error:

def my_func(x):     print(x) [my_func(my_item) for my_item in my_list] 

Answer 1

Because print is not a function, it's a statement, and you can't have them in expressions. This gets more obvious if you use normal Python 2 syntax:

my_list=[1,2,3] [print my_item for my_item in my_list] 

That doesn't look quite right. :) The parenthesizes around my_item tricks you.

This has changed in Python 3, btw, where print is a function, where your code works just fine.

Answer 2

list comprehension are designed to create a list. So using print inside it will give an error no-matter we use print() or print in 2.7 or 3.x. The code

[my_item for my_item in my_list]  

makes a new object of type list.

print [my_item for my_item in my_list] 

prints out this new list as a whole

refer : here