In Python 3.13 REPL, print() adds extra indentation when invoked from a tkinter event handler #135045
Description
Bug report
Bug description:
Here is an interactive python 3.13 session on macOS 15.5 using the python.org distribution:
Python 3.13.3 (v3.13.3:6280bb54784, Apr 8 2025, 10:47:54) [Clang 15.0.0 (clang-1500.3.9.4)] on d\
arwin
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>>> import tkinter
>>> interp = tkinter.Tk()
>>> f = tkinter.Frame(interp, background='blue', width=30, height=30)
>>> f.pack(padx=30, pady=30)
>>> def handler(event):
... print("Click")
...
>>> f.bind('<Button-1>', handler)
'4384102400handler'
>>> # Now click the mouse on the blue square a few times.
>>> Click
Click
Click
Click
Click
The words "Click" should not be indented. No spaces are being printed. The REPL behaves as if the text is ended with a newline but not with the implicit carriage return.
I expect the print command to behave the same way as it does here:
>>> for i in range(5): print("Click")
...
Click
Click
Click
Click
Click
CPython versions tested on:
3.13
Operating systems tested on:
macOS