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]
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.
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
It's a syntax error because print is not a function. It's a statement. Since you obviously don't care about the return value from print (since it has none), just write the normal loop:
for my_item in my_list:
print my_item
print in python 3 makes it more obvious on how to use it.
the square brackets in the list comprehension denotes that the output will actually be a list.
L1=['a','ab','abc']
print([item for item in L1])
This should do the trick.
