"SyntaxError: invalid syntax" running code in Doing Math With Python b

[saucerdesigner]

Hello, I'm scratching my head trying to get the code in the book Doing Math With Python by Amit Saha on page 9 to work.

Python 3.8.5 (default, Jul 28 2020, 12:59:40)
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license()" for more information.

>>> from fractions import Fraction >>> try: a = float(input('Enter a number: ')) #keyword except doesn't un-indent, I have to force it with a backspace except ValueError: print('You entered an invalid number') Enter a number 3/4 SyntaxError: invalid syntax >>>

What am I doing wrong? Wrong python version?

Regards,

David

[DeaD_EyE]

Hint: Use https://pypi.org/project/ipython/

You have to indent explicit by 4 spaces after the try and the except:

>>> try: ... a = float(input('Enter a number: ')) ... except ValueError: ... print('You entered an invalid number') ... Enter a number: 3/4 You entered an invalid number >>>

Same with IPython repl:

In [1]: try: ...: a = float(input('Enter a number: ')) ...: except ValueError: ...: print('You entered an invalid number') ...: Enter a number: 3/4 You entered an invalid number In [2]:

The benefit here is, that the indentation for multiline is made automatically.
You don't have to hit 4 times the space, if you use IPython. Also Tabulator is converted into 4 spaces :-)

[saucerdesigner]

Hint: Use https://pypi.org/project/ipython/

You have to indent explicit by 4 spaces after the try and the except:

>>> try: ... a = float(input('Enter a number: ')) ... except ValueError: ... print('You entered an invalid number') ... Enter a number: 3/4 You entered an invalid number >>>

Same with IPython repl:

In [1]: try: ...: a = float(input('Enter a number: ')) ...: except ValueError: ...: print('You entered an invalid number') ...: Enter a number: 3/4 You entered an invalid number In [2]:

The benefit here is, that the indentation for multiline is made automatically.
You don't have to hit 4 times the space, if you use IPython. Also Tabulator is converted into 4 spaces :-)

Thank you! Evidently I don't yet know how to run IDLE, so I tried PyCharm Edu and it ran ok. Thanks again1