python : why is this invalid syntax?

Question

i wrote this code to draw circles and hexagons.

import turtle
t = turtle.Turtle()
t.shape("turtle")
for(int i=1; i<=6; i++){
t.circle(100)
t.forward(100)
t.left(60)
t.forward(100)
t.left(60)
t.forward(100)
t.left(60)
t.forward(100)
t.left(60)
t.forward(100)
t.left(60)
t.forward(100)
}

i made "int i" to iterate but debugging says it's invalid syntax. why? i'm not native english speaker, so if you could please tell me easily. i'll be really appreciated.

`for` loops don't look like that in Python. Variable declarations don't look like that `int i=1;` in Python. Things have to be indented in Python. Basically, what you have written is not Python. — khelwood, Feb 03 '17 at 12:14
Indention went wrong. Check a basic Python tutorial I think is a good idea (no offense) — frlan, Feb 03 '17 at 12:14
@윤지영 you should probably look at the documentation if you have questions about basic syntax and constructs: https://docs.python.org/3.6/tutorial/controlflow.html — Peter Wood, Feb 03 '17 at 12:19
@PeterWood thank you but i feel uncomfortable to read documentations cause reading english is a big deal for me ;0 — June, Feb 03 '17 at 12:27

score 1 · Answer 1 · answered Feb 03 '17 at 12:14

you want to use a proper python loop with range:

for _ in range(6):
    t.circle(100)
    t.forward(100)
    t.left(60)
    t.forward(100)
    t.left(60)
    t.forward(100)
    t.left(60)
    t.forward(100)
    t.left(60)
    t.forward(100)
    t.left(60)
    t.forward(100)

Since your loop variable is unused, you can use _ to "anonymize" it.

vovaminiof · Answer 2 · 2017-02-03T12:19:40.473

0

Python version

import turtle


t = turtle.Turtle()
t.shape("turtle")

for _ in xrange(6):
    t.circle(100)
    t.forward(100)
    t.left(60)
    t.forward(100)
    t.left(60)
    t.forward(100)
    t.left(60)
    t.forward(100)
    t.left(60)
    t.forward(100)
    t.left(60)
    t.forward(100)

UPD: You should use range instead of xrange if you are using Python 3.

To find out which version of Python you have you can execute python --version

You can also read about Python loops over here https://wiki.python.org/moin/ForLoop

edited Feb 03 '17 at 12:19

answered Feb 03 '17 at 12:15

vovaminiof

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You should probably use `range` instead of `xrange` unless you know that the OP is using Python 2. – khelwood Feb 03 '17 at 12:16
can i ask what is OP? – June Feb 03 '17 at 12:21
OP stands for Original Poster, in particular case you :) – vovaminiof Feb 03 '17 at 12:22
@vovaminiof thank you :) – June Feb 03 '17 at 13:45

python : why is this invalid syntax?

2 Answers2