Why Does `print(value, end=' ')` Cause a SyntaxError in Python 3.x?

Troubleshooting SyntaxError for Print with Keyword Argument end='

In Python 3.x, using the end=' ' syntax when calling print() may trigger a SyntaxError. This is often encountered when upgrading code from Python 2.x, where print is still treated as a statement rather than a function.

Explanation

In Python 2.x, print is syntactically a statement, and therefore doesn't accept keyword arguments. As a result, print("foo" % bar, end=" ") is invalid syntax and will raise a SyntaxError.

In Python 3.x, however, print is upgraded to a function, allowing it to take keyword arguments including end. This means that print("foo" % bar, end=" ") is now valid and expected syntax in Python 3.x.

Resolution

If you're encountering the SyntaxError in Python 3.x, ensure that you're using the correct syntax: print(value, end=" ").

For code portability, consider using the following idioms in Python 2.x:

print("foo" % bar, )  # Add a trailing comma to prevent a line break
sys.stdout.write("foo" % bar + " ")  # Use sys.stdout for direct output manipulation

Alternatively, if possible, you can enable the print_function future import in Python 2.x to use the Python 3.x print syntax:

from __future__ import print_function

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