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Q&A Why can parentheses cause exceptions in Python when using for loops?

Using parentheses in Javascript is always needed when you want to create functions, if/else statements and for/while loops. But in Python it has a function that is called tuples. When using an if s...

1 answer  ·  posted 12mo ago by Bennshinpoes‭  ·  edited 12mo ago by trichoplax‭

Question python syntax-error
#2: Post edited by user avatar trichoplax‭ · 2023-04-17T06:38:57Z (12 months ago)
Add tag and fix typos
  • Why can parenthesis cause exceptions in Python when using for loops?
  • Why can parentheses cause exceptions in Python when using for loops?
  • Using parenthesis in Javascript is always needed when you wanted to create functions, if/else statements and for/while loops. But in Python it has a function that is called tuples. When using an if statement for example, it won't be a big deal when I use parenthesis. But when it comes to for...in loops it seems to cause exceptions. For example,
  • ```
  • fruits = ["Apple", "Banana", "Orange"]
  • for (fruit in fruits):
  • print(fruit)
  • ```
  • This will return an exception, `SyntaxError: invalid syntax`
  • But when I remove the parenthesis it will work again. Is this because the parenthesis that acts as a tuple prevent the for...in loop to iterate over the list and set a value from the list to fruit? Which makes it not possible to be printed?
  • Using parentheses in Javascript is always needed when you want to create functions, `if`/`else` statements and `for`/`while` loops. But in Python it has a function that is called tuples. When using an `if` statement for example, it won't be a big deal when I use parentheses. But when it comes to `for`...`in` loops it seems to cause exceptions. For example,
  • ```
  • fruits = ["Apple", "Banana", "Orange"]
  • for (fruit in fruits):
  • print(fruit)
  • ```
  • This will return an exception, `SyntaxError: invalid syntax`
  • But when I remove the parentheses it will work again. Is this because the parentheses that act as a tuple prevent the `for`...`in` loop from iterating over the list and setting a value from the list to `fruit`? Which makes it not possible to be printed?
#1: Initial revision by user avatar Bennshinpoes‭ · 2023-04-16T16:23:01Z (12 months ago)
Why can parenthesis cause exceptions in Python when using for loops?
Using parenthesis in Javascript is always needed when you wanted to create functions, if/else statements and for/while loops. But in Python it has a function that is called tuples. When using an if statement for example, it won't be a big deal when I use parenthesis. But when it comes to for...in loops it seems to cause exceptions. For example,

```
fruits = ["Apple", "Banana", "Orange"]
for (fruit in fruits):
 print(fruit)
```

This will return an exception, `SyntaxError: invalid syntax`

But when I remove the parenthesis it will work again. Is this because the parenthesis that acts as a tuple prevent the for...in loop to iterate over the list and set a value from the list to fruit? Which makes it not possible to be printed?