When I try to use a
>>> print "Hello, World!" File "<stdin>", line 1 print "Hello, World!" ^ SyntaxError: Missing parentheses in call to 'print'
What does that mean?
This error message means that you are attempting to use Python 3 to follow an example or run a program that uses the Python 2
print "Hello, World!"
The statement above does not work in Python 3. In Python 3 you need to add parentheses around the value to be printed:
“SyntaxError: Missing parentheses in call to ‘print’” is a new error message that was added in Python 3.4.2 primarily to help users that are trying to follow a Python 2 tutorial while running Python 3.
In Python 3, printing values changed from being a distinct statement to being an ordinary function call, so it now needs parentheses:
>>> print("Hello, World!") Hello, World!
In earlier versions of Python 3, the interpreter just reports a generic syntax error, without providing any useful hints as to what might be going wrong:
>>> print "Hello, World!" File "<stdin>", line 1 print "Hello, World!" ^ SyntaxError: invalid syntax
As for why
In Python 2:
>>> import sys >>> print >> sys.stderr, 1, 2, 3,; print >> sys.stderr, 4, 5, 6 1 2 3 4 5 6
In Python 3:
>>> import sys >>> print(1, 2, 3, file=sys.stderr, end=" "); print(4, 5, 6, file=sys.stderr) 1 2 3 4 5 6
Starting with the Python 3.6.3 release in September 2017, some error messages related to the Python 2.x print syntax have been updated to recommend their Python 3.x counterparts:
>>> print "Hello!" File "<stdin>", line 1 print "Hello!" ^ SyntaxError: Missing parentheses in call to 'print'. Did you mean print("Hello!")?
Since the “Missing parentheses in call to print” case is a compile time syntax error and hence has access to the raw source code, it’s able to include the full text on the rest of the line in the suggested replacement. However, it doesn’t currently try to work out the appropriate quotes to place around that expression (that’s not impossible, just sufficiently complicated that it hasn’t been done).
TypeError raised for the right shift operator has also been customised:
>>> print >> sys.stderr Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unsupported operand type(s) for >>: 'builtin_function_or_method' and '_io.TextIOWrapper'. Did you mean "print(<message>, file=<output_stream>)"?
Since this error is raised when the code runs, rather than when it is compiled, it doesn’t have access to the raw source code, and hence uses meta-variables (
<output_stream>) in the suggested replacement expression instead of whatever the user actually typed. Unlike the syntax error case, it’s straightforward to place quotes around the Python expression in the custom right shift error message.
In Python 3, you can only print as:
But in Python 2, the parentheses are not necessary.
There is a change in syntax from Python 2 to Python 3.
In Python 2,
print "Hello, World!"
will work but in Python 3, use parentheses as
This is equivalent syntax to Scala and near to Java.
Unfortunately, the old xkcd comic isn’t completely up to date anymore.
Since Python 3.0 you have to write:
And someone has still to write that
antigravity library 🙁
If your code should work in both Python 2 and 3, you can achieve this by loading this at the beginning of your program:
from __future__ import print_function # If code has to work in Python 2 and 3!
Then you can print in the Python 3 way:
If you want to print something without creating a new line – you can do this:
for number in range(0, 10): print(number, end=', ')
Outside of the direct answers here, one should note the other key difference between python 2 and 3. The official python wiki goes into almost all of the major differences and focuses on when you should use either of the versions. This blog post also does a fine job of explaining the current python universe and the somehow unsolved puzzle of moving to python 3.
As far as I can tell, you are beginning to learn the python language. You should consider the aforementioned articles before you continue down the python 3 route. Not only will you have to change some of your syntax, you will also need to think about which packages will be available to you (an advantage of python 2) and potential optimizations that could be made in your code (an advantage of python 3).
Basically, since Python 3.x you need to use
Python 2.x: print "Lord of the Rings"
Python 3.x: print("Lord of the Rings")
>>> items = ['foo', 'bar', 'baz'] >>> print(*items, sep='+') foo+bar+baz
I could also just add that I knew everything about the syntax change between
Python3, and my code was correctly written as
print("string") and even
But after some time of debugging I realized that my bash script was calling python like:
which had the effect of calling my python script by default using
python2.7 which gave the error. So I changed my bash script to:
which of coarse uses python3 to run the script which fixed the error.
You’re using python 3, where you need brackets when printing.
So I was getting this error
from trp import BoundingBox, Document File "C:UsersKshitij AgarwalAppDataRoamingPythonPython39site-packagestrp__init__.py", line 31 print ip ^ SyntaxError: Missing parentheses in call to 'print'. Did you mean print(ip)?
This is a Python package error, in which Python2 has been used and you are probably running this on Python3.
One solution could be to convert Python2
print something to Python3
print(something) for every line in each file in the package folder, which is not a good idea . I mean, you can do it but still there are better ways.
To perform the same task, there is a package named 2to3 in Python which converts Python2 scripts to Python3 scripts. To install it, execute the command in terminal..
pip install 2to3
Then change the directory in terminal to the location where the package files are present, in my case – C:UsersKshitij AgarwalAppDataRoamingPythonPython39site-packagestrp
Now execute the command
2to3 . -w
and voila, all the Python2 files in that directory will be converted to Python3.
Note:- The above commands hold true for other operating systems as well. Only Python package path will vary as per the system.
print "text" is not the way of printing text in python as this won’t work
print("text") will print said text on your screen in the command line