Use another augmented assignment statement

[elfring]

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👀 Some source code analysis tools can help to find opportunities for improving software components.
💭 I propose to increase the usage of augmented assignment statements accordingly.

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diff --git a/examples/martingale.py b/examples/martingale.py
index dcbcf7a..f4ffcfa 100644
--- a/examples/martingale.py
+++ b/examples/martingale.py
@@ -176,7 +176,7 @@ class MartingaleTrader(object):
                     target_value = total_buying_power - self.last_price
                 target_qty = int(target_value / self.last_price)
                 if self.streak_increasing:
-                    target_qty = target_qty * -1
+                    target_qty *= -1
                 self.send_order(target_qty)
         # Update our account balance
         self.equity = float(self.api.get_account().equity)

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