Learn Programming in Python with Cody Jackson

Gate valve class

Gate valves are children of the parent Valve class, as shown in the following code example:

# valve.py (part 8)1  class Gate(Valve): 
2      """Open/closed valve.""" 
3      def read_position(self): 
4          """Identify the position of the valve.""" 
5          if self.position == 0: 
6              return "{name} is closed.".format(name=self.name) 
7          elif self.position == 100: 
8              return "{name} is open.".format(name=self.name) 
9          else:  # bad condition 
10              return "Warning! {name} is partially open.".format(name=self.name) 
11 
12      def turn_handle(self, new_position): 
13          """Change the status of the valve.""" 
14          if new_position == 0: 
15              self.close() 
16          elif new_position == 100: 
17              self.open() 
18          else:  # Shouldn't get here 
19              return "Warning: Invalid valve position." 

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