Use `for` in `print()` will give a generator on Python 3.x? -

why , how works? example i'm writing list comprehension this:

>>> = (10, 30, 20) >>> print([q q in a]) [10, 30, 20]

at now, if remove [], work, but:

>>> = (10, 30, 20) >>> print(q q in a) <generator object <genexpr> @ 0x7fe527d1dca8>

does python make generator here? , if without print():

>>> = (10, 30, 20) >>> b = q q in  file "<input>", line 1   b = q q in           ^ syntaxerror: invalid syntax

i'm thinking because (q q in a) make generator, that's impossible, i'm not using 2 pair of () like:

>>> = (10, 30, 20) >>> print((q q in a)) # here 2 pair of `()` <generator object <genexpr> @ 0x7fe527d1dca8>

does python make generator here?

yes. quoting official documentation of generator expressions,

the parentheses can omitted on calls 1 argument.

note exception actual syntax

generator_expression ::=  "(" expression comp_for ")"

so, when did

b = q q in

python not able parse it, not valid python expression. why getting syntaxerror.

if wanted print elements generator expression, can unpack result of print function, suggested blckknght, this

>>> = (10, 30, 20) >>> print(*(q q in a)) 10 30 20

Maxid