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Fix the indentation in Extending Python code example (GH-3244)

Code was indented with three spaces.
Fixed using four spaces.
S
Sergey Fedoseev committed
d9a2b99ac45b5529d2a6227b0d529397be831dab
Parent: cb76029
Committed by Mariatta <Mariatta@users.noreply.github.com> on 8/30/2017, 2:50:40 PM