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+--- Thread: is this really a syntax error? (/thread-42191.html)
is this really a syntax error? - Skaperen - May-24-2024
if i run this from a file it works as expected. if i type the same code into interactive python, i get a syntax error. which is the mistake? is this really a syntax error?
Output:lt1a/forums/2 /home/forums 5> cat -n this.py
1 foo = []
2 for x in foo:
3 print('hi')
4 print('bye')
lt1a/forums/2 /home/forums 6> python3 this.py
bye
lt1a/forums/2 /home/forums 7> python3
Python 3.8.10 (default, Nov 22 2023, 10:22:35)
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> foo = []
>>> for x in foo:
... print('hi')
... print('bye')
File "<stdin>", line 3
print('bye')
^
SyntaxError: invalid syntax
>>> print('bar')
bar
>>>
lt1a/forums/2 /home/forums 8>RE: is this really a syntax error? - bowlofred - May-24-2024
In the interactive interpreter, if you enter a command that requires continuation information (like an if or a loop), the prompt changes to the secondary prompt
....You have to exit that mode (by entering a blank line) before entering a new command.
RE: is this really a syntax error? - Skaperen - May-24-2024
so what did it think was a syntax error?
RE: is this really a syntax error? - deanhystad - May-25-2024
I expected an indentation error, but a little experiment shows you only get that for the line immediately following for/if. Indentation errors for the second line are reported as syntax errors.
For the interactive interpreter it is a syntax error. As mentioned by bowlofred, the ... prompt tells you that you are in the body following the for statement. Enter an empty line to get the >>> prompt.
RE: is this really a syntax error? - snippsat - May-25-2024
If use a better interactive interpreter like eg Ipython or ptpython(my favorite) it will work.
foo = []
for x in foo:
print('hi')
print('bye')Same copy of code over into the 3 interactive interpreter.C:\code
λ ipython
Python 3.12.2 (tags/v3.12.2:6abddd9, Feb 6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.24.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: foo = []
...: for x in foo:
...: print('hi')
...: print('bye')
bye
In [2]: exit()
C:\code
λ ptpython
>>> foo = []
... for x in foo:
... print('hi')
... print('bye')
bye
>>> exit()
# With the stander one it failes
C:\code
λ python
Python 3.12.2 (tags/v3.12.2:6abddd9, Feb 6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> foo = []
>>> for x in foo:
... print('hi')
... print('bye')
File "<stdin>", line 3
print('bye')
^^^^^
SyntaxError: invalid syntax
>>>