Brackets around if and for

Question

I am new to python and wondering. Why is this possible if brackets allow and not for.

• if (1==2):

• for (i in range(1,10)):

• while (i<10):

The first and third are valid syntax, but not the second.

File "<stdin>", line 2
    for (i in range(1,10)):
                          ^

Answer 1

Because it is for (i in range(1,10))not syntactically correct.

Suppose that he (i in range(1,10))understood anyway, he would return a logical value. So you are trying to say for Trueor for False, and boolean cannot be repeated, and this is not valid syntax.

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The reason your other examples work is because they expect a boolean value that is returned from 1 == 2andi < 10

Answer 2

• if (True of False). : (1) + (1)

• for VAR in LIST - , , :

  • ,

  , Python ?

- (?), for: http://docs.python.org/3/reference/compound_stmts.html#the-for-statement

for_stmt ::=  "for" target_list "in" expression_list ":" suite
              ["else" ":" suite]