diff --git a/backtrader/analyzer.py b/backtrader/analyzer.py
index 881302683..4de263e87 100644
--- a/backtrader/analyzer.py
+++ b/backtrader/analyzer.py
@@ -397,7 +397,7 @@ def _get_subday_cmpkey(self, dt):
             point = point * 1e6 + dt.microsecond
 
         # Apply compression to update point position (comp 5 -> 200 // 5)
-        point = point // self.compression
+        point //= self.compression
 
         # Move to next boundary
         point += 1
diff --git a/backtrader/analyzers/drawdown.py b/backtrader/analyzers/drawdown.py
index 62e1b2623..34bed9daf 100644
--- a/backtrader/analyzers/drawdown.py
+++ b/backtrader/analyzers/drawdown.py
@@ -106,7 +106,7 @@ def next(self):
         r.max.moneydown = max(r.max.moneydown, moneydown)
         r.max.drawdown = maxdrawdown = max(r.max.drawdown, drawdown)
 
-        r.len = r.len + 1 if drawdown else 0
+        r.len += 1 if drawdown else 0
         r.max.len = max(r.max.len, r.len)
 
 
diff --git a/backtrader/indicators/psar.py b/backtrader/indicators/psar.py
index 8dc41b875..89e21536d 100644
--- a/backtrader/indicators/psar.py
+++ b/backtrader/indicators/psar.py
@@ -151,7 +151,7 @@ def next(self):
                 ep = lo
                 af = min(af + self.p.af, self.p.afmax)
 
-        sar = sar + af * (ep - sar)  # calculate the sar for tomorrow
+        sar += af * (ep - sar)  # calculate the sar for tomorrow
 
         # make sure sar doesn't go into hi/lows
         if tr:  # long trade
diff --git a/backtrader/resamplerfilter.py b/backtrader/resamplerfilter.py
index 010a6b6bc..5b7648a13 100644
--- a/backtrader/resamplerfilter.py
+++ b/backtrader/resamplerfilter.py
@@ -373,7 +373,7 @@ def _calcadjtime(self, greater=False):
 
         # Apply compression to update the point position (comp 5 -> 200 // 5)
         # point = (point // self.p.compression)
-        point = point // self.p.compression
+        point //= self.p.compression
 
         # If rightedge (end of boundary is activated) add it unless recursing
         point += self.p.rightedge