David Howlett added the comment:
I am using python 3.5 in a REPL in an IDE called Komodo running on Windows.
After reading your comments I wrote the following python file:
try:
x = float('∞')
except ValueError:
print('Value error was correctly thrown')
This throws a ValueError as you describe. I get the following behaviour in
powershell and cmd.exe:
>>> float('\u221e')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: could not convert string to float: '\u221e'
In the Komodo REPL I see the following behaviour:
>>> '∞'
'8'
>>> '\u221e'
'\u221e'
I now believe the issue is with how Komodo reads in characters from its REPL.
In the course of testing I also found out that the REPL in Komodo suffers and
internal fault whenever it tries to print '∞' in a debug message.
Unless someone objects I will close this issue in the Python bug tracker and
open a new issue in the Komodo bug tracker.
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<http://bugs.python.org/issue27412>
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