Style guide update

doc/internal/Contributing.md

@@ -114,7 +114,8 @@ defines `__all__`.

                                
                                
                                
                            
                                
                                    
                                        
                                            114  
                                            Never insert more than one space around operators and other symbols. Never add spaces just to align lines.
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            115  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            116  
                                            ##### When to use
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        117 -
                                        * around the lowest priority operators in an expression, comparisons, assignments, and logical operators, as well as the function annotation arrow
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        117 +
                                        * around the lowest priority operators in an expression, comparisons, assignments, and logical operators, as well as the function annotation arrow;
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        118 +
                                          please resist the formatter's urge to space all operators; spacing them according to their priority makes the code more readable
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            119  
                                              ~~~python
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            120  
                                              # Do
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            121  
                                              thing += 10 + 2*thing