First, you must specify -regex in the command if you want "\n" to mean a newline instead of literal \n.
Second, "-cat:Dumpers" is not correct, use -cat:"Dumpers" or simply -cat:Dumpers instead, if you want to work with this category. ("" is only necessary if your category name has a space.)

2011/1/16 CobraSA <>
command: D:\Development\pywikibot>python "-cat:Dumpers" "|\n|-" "|Yes\n|-"
It makes no chnge even the the dumpers page are full of tables with | empty followed by |-
any help please?

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