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Edit summary for version 12 :

Version 11

Version 12

Idiom #59 Write to standard error stream

Print the message "x is negative" to standard error (stderr), with integer x value substitution (e.g. "-2 is negative").

Idiom #59 Write to standard error stream

Print the message "x is negative" to standard error (stderr), with integer x value substitution (e.g. "-2 is negative").

Imports
import sys
Code
print(x, "is negative", file=sys.stderr)
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Python3