Python2

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$A comment, this is so you can read your program later.$Anything after the $is ignored by python. print “I could have code like thies.”$and the comment after is ignored
$You can also use a comment to “disable” or comment out a piece of code:$print “This won’t run.”
print “This will run.”

save to a file named ex2.py
($ is #)

note:
多行注释可以收尾各用三个连续的单引号或者双引号括起来。