I tried this code, following along with a tutorial:
my_name = 'Zed A. Shaw'
print(f"Let's talk about {my_name}.")
But I get an error message highlighting the last line, like so:
print(f"Let's talk about {my_name}.")
^
SyntaxError: invalid syntax
Why?
If you get an error like this from someone else's code, do not try to fix it yourself - the other project simply does not support your Python version (One example: Using pytesseract on Python 2.7 and Windows XP). Look for an alternative instead, or check the project's documentation or other support resources for a workaround.
In particular, the built-in pip package manager has an issue where newer versions of pip require a newer Python version, so old installations cannot upgrade pip past a certain point. See Installing pip is not working in python < 3.6 or Upgrading pip fails with syntax error caused by sys.stderr.write(f"ERROR: {exc}") for details.
If an external tool warns about the problem even though Python supports the feature, update the tool. See Getting invalid syntax error when using Pylint but code runs fine for an example.
This question is specifically about the situation where any attempt to use f-strings fails (the ^ in the error message will point at the closing quote). For common problems with specific f-string syntax, see How do I escape curly-brace ({}) characters in a string while using .format (or an f-string)?, f-string formula inside curly brackets not working, Discord.py - SyntaxError f-string: empty expression not allowed, How to use newline '\n' in f-string to format output in Python 3.6?.
For details on alternate approaches to string formatting, see How do I put a variable’s value inside a string (interpolate it into the string)?.
I think you have an old version of python. try upgrading to the latest version of python. F-string literals have been added to python since python 3.6. you can check more about it here
This is a python version problem.
Instead of using
print(f"Let's talk about {my_name}."
use
print("Let's talk about {}.".format(my_name))
in python2.
Your code works on python3.7.
Check it out here:
my_name= "raushan"
print(f"Let's talk about {my_name}.")
https://repl.it/languages/python3
Python Interpreter causes the following issue because of the wrong python version you calling when executing the program as f strings are part of python 3 and not python 2. You could do this python3 filename.py, it should work. To fix this issue, change the python interpreter from 2 to 3.
f-strings were added in python 3.6. In older python versions, an f-string will result in a syntax error.
If you don't want to (or can't) upgrade, see How do I put a variable inside a String in Python? for alternatives to f-strings.
I think this is due to the old version. I have tried in the new version and the executing fine. and the result is as expected.
I believe the problem you are having here is down to you using python 2 without realizing it. if you haven't set it up on your machine to have python 3 as your default version you should execute python3 in your terminal instead of the standard 'python' command.
I had this problem so hopefully, this answer can be of help to those looking for it.
I think they had typed
python file.py
to run the program in the Mac or linux that runs the python 2 version directly because OS defaultly contain python 2 version, so we needed to type
python3 file.py
That's the solution for the problem
python2 and python3 running command
Related
When I use a plugin that requires python, it can't find it and barfs.
The places that seem to being searched are:
Using -version I see both:
+python/dyn
+python3/dyn
However :echo has("python3") returns 0.
I'm not sure if this is compile time config, or runtime-configurable via .vimrc.
I'm not a python developer, and the few times I've ventured into that world were in the middle of the python2/python3 mess that turned me off completely. I've played around enough to have configured pyenv it seems, and get
╰─$ which python
/Users/benlieb/.pyenv/shims/python
╰─$ python --version
Python 3.10.3
Can anyone help shed light on what to do to get python3 findable/usable in my vim?
Update:
Following #romainl's suggestion below I set in my .vimrc
set pythonthreedll=/Users/benlieb/.pyenv/shims/python
But getting the following error:
+python/dyn and +python3/dyn are described here: :help python-dynamic.
By default, :help 'pythonthreedll' points to:
/opt/homebrew/Frameworks/Python.framework/Versions/3.10/Python
because MacVim is built against that version. The message in your screenshot says that there is nothing at that path. In order to have a working Python 3 interface, you can either:
install Python 3.10 via homebrew,
or point pythonthreedll to a valid path.
For example, I don't use Homebrew so the default value is useless to me, but I use MacPorts so this is my pythonthreedll:
set pythonthreedll=/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/libpython3.10.dylib
After some time, I found the following works, thought it was not a fun path of discovery.
let &pythonthreedll = trim(system("pyenv which python"))
This question already has an answer here:
Can't import annotations from __future__
(1 answer)
Closed 1 year ago.
I am try to run code
sh run.sh
and it showed me the error
File "/anaconda3/envs/_galaxy_/lib/python3.6/site-packages/filelock/__init__.py", line 8
from __future__ import annotations
^
SyntaxError: future feature annotations is not defined
I saw some solutions indicated that I need to update my python version, but I am in a python verion 3.9.7.
(py39) KedeMacBook-Pro:~ ke$ python --version
Python 3.9.7
However, in the error code it showed a python veriosn of 3.6. So, I am not sure where went wrong. Why it is not using the python envrionment that I have? Please help, thank you.
Based on the error, it looks like your code is using Python 3.6 and not Python 3.9. This import is available starting from Python 3.7. Check run.sh to make sure it is referencing the right python interpreter.
I'd also recommend using a virtual env using the python version you require and running your script inside that.
I'm getting a syntax error on my f-string statements even though i'm using python version 3.7.4
my_name= "raushan"
print(f"Let's talk about {my_name}")
File "<ipython-input-5-0b1a3af6fa22>", line 2
print(f"Let's talk about {my_name}")
^
SyntaxError: invalid syntax
python version i'm using.
!python --version
Python 3.7.4
I don't have enough reputation to comment so I'll do it here.
I believe that your error is that in line 2 before the print statement, you added an unnecessary space (indent).
Python doesn't like unnecessary indents.
Does this work for you?
my_name= "raushan"
print(f"Let's talk about {my_name}")
Edit:
Apparently both the lines have unnecessary indents.
After I enter:
python manage.py migrate
I get an error on this line:
archive_files = s3.list_objects_v2(Bucket=settings.ARCHIVE_BUCKET, Prefix=f"{org.id}/")["Contents"]
^
I don't understand why django 2.0.3 is complaining.
It looks like you're using format strings with python 3.5, however support for formatted string literals was not added until python 3.6. More information can be found in the python documentation. You will either need to update your python version or format the string another way. e.g. "{}/".format(org.id)
In the traceback we see that the caret points to a string interpolation [PEP-0498]. This feature is supported since python-3.6, but you run your code with:
python3.5 manage.py runserver
so the interpreter does not understand this string interpolation.
You basically have two options:
try to run this with python-3.6 (or higher), although there is of course always a risk that something is broken then:
python3.6 manage.py runserver
perform proper formatting, replace:
prefix=f"{org.id}/"
with:
prefix="{}/".format(org.id)
or some other way to format this.
I tried this code, following along with a tutorial:
my_name = 'Zed A. Shaw'
print(f"Let's talk about {my_name}.")
But I get an error message highlighting the last line, like so:
print(f"Let's talk about {my_name}.")
^
SyntaxError: invalid syntax
Why?
If you get an error like this from someone else's code, do not try to fix it yourself - the other project simply does not support your Python version (One example: Using pytesseract on Python 2.7 and Windows XP). Look for an alternative instead, or check the project's documentation or other support resources for a workaround.
In particular, the built-in pip package manager has an issue where newer versions of pip require a newer Python version, so old installations cannot upgrade pip past a certain point. See Installing pip is not working in python < 3.6 or Upgrading pip fails with syntax error caused by sys.stderr.write(f"ERROR: {exc}") for details.
If an external tool warns about the problem even though Python supports the feature, update the tool. See Getting invalid syntax error when using Pylint but code runs fine for an example.
This question is specifically about the situation where any attempt to use f-strings fails (the ^ in the error message will point at the closing quote). For common problems with specific f-string syntax, see How do I escape curly-brace ({}) characters in a string while using .format (or an f-string)?, f-string formula inside curly brackets not working, Discord.py - SyntaxError f-string: empty expression not allowed, How to use newline '\n' in f-string to format output in Python 3.6?.
For details on alternate approaches to string formatting, see How do I put a variable’s value inside a string (interpolate it into the string)?.
I think you have an old version of python. try upgrading to the latest version of python. F-string literals have been added to python since python 3.6. you can check more about it here
This is a python version problem.
Instead of using
print(f"Let's talk about {my_name}."
use
print("Let's talk about {}.".format(my_name))
in python2.
Your code works on python3.7.
Check it out here:
my_name= "raushan"
print(f"Let's talk about {my_name}.")
https://repl.it/languages/python3
Python Interpreter causes the following issue because of the wrong python version you calling when executing the program as f strings are part of python 3 and not python 2. You could do this python3 filename.py, it should work. To fix this issue, change the python interpreter from 2 to 3.
f-strings were added in python 3.6. In older python versions, an f-string will result in a syntax error.
If you don't want to (or can't) upgrade, see How do I put a variable inside a String in Python? for alternatives to f-strings.
I think this is due to the old version. I have tried in the new version and the executing fine. and the result is as expected.
I believe the problem you are having here is down to you using python 2 without realizing it. if you haven't set it up on your machine to have python 3 as your default version you should execute python3 in your terminal instead of the standard 'python' command.
I had this problem so hopefully, this answer can be of help to those looking for it.
I think they had typed
python file.py
to run the program in the Mac or linux that runs the python 2 version directly because OS defaultly contain python 2 version, so we needed to type
python3 file.py
That's the solution for the problem
python2 and python3 running command