increment operator not working in python code

Asked Jun 03 '19 at 09:13

Active Jun 03 '19 at 09:19

Viewed 40 times

Increment operator issue in python code :

In following code :

n = eval(input ("enter the rows for pattern"))
temp =1
for i in range(1,n+1) :
    temp =1
    while temp <=i :
        print("*", end = '')
        temp++
    print('')

The output is:

> File  "C:\user\new\pattern.py" , line 7
>     temp++  <p>       ^ SyntaxError: invalid syntax </p>

also if I convert temp++ to ++temp it is running in infinite loop

Can someone explain me what's wrong in it?

Edit 1 : AS increment operator don't work in python, so why ++temp is giving an infinte loop?

edited Jun 03 '19 at 09:19

asked Jun 03 '19 at 09:13

Abhishek

3

Use `temp += 1`. Python doesn't have `++` – Chris Jun 03 '19 at 09:14
2

There is no increment op in python. temp += 1. Do this. – Praveenkumar Jun 03 '19 at 09:14
Python doesn't have any increment operator – Karthik Vg Jun 03 '19 at 09:17
2

BTW, don't use `eval` if a simple `int` does the trick. In fact, never ever use `eval`: [Eval really is dangerous](https://nedbatchelder.com/blog/201206/eval_really_is_dangerous.html) – Matthias Jun 03 '19 at 09:18
1

will remember for next time about Eval :) – Abhishek Jun 03 '19 at 09:20
@Chris : why ++temp was working ? – Abhishek Jun 03 '19 at 09:21
@LuciFiEr `++temp` is equivalent as just doing `1` since positive of positive of `1` is `1` :). Thus effectively doing nothing, and never breaking the `while` loop, thus to infinity and beyond! – Chris Jun 03 '19 at 09:22
1

gotcha ,new to this will take some time to rectify silly mistakes :) – Abhishek Jun 03 '19 at 09:24

increment operator not working in python code

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