amazon web services - Properly setting DeleteOnTermination on an existing EBS volume using boto -

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Digging through the code (for example, consider), I have found that I read using this feature I can: 

  example.block_device_mapping ['/ dev / sdz']. Delete_on_termination   
 ... and toggle using it:  
  example.modify_attribute ('Blockdevicemapping', ['/ dev / sdz = 1'] ) #Toggles for example Modify_attribute ('blockdevicemapping', ['/ dev / sdz']) # Toggle Off   
 But it is one-symmetric and I think I'm missing some high level functionality .  
 It should not be more like:  
  block_device_type = instance.block_device_mapping ['/ dev / sdz'] block_device_type.delete_on_termination = True block_device_type.save () # I This API   
?   
 
 
 You set this setting on and off formatted string  '% s =% d'  list.  
 Switch to    
  & gt; & Gt; & Gt;  & Gt; & Gt; & Gt; Inst.modify_attribute ('blockDeviceMapping', ['/ dev / sda1 = 0'])   
 
 I verified after every attempt to change the setting using the change outside of the Python Done:  
  $ aws ec2 Description-Example-Attribute - Instance-ID-7890 BCD - Block Block Exception Mapping   
     
  1.  Calling  inst.modify_attribute ('BlockDeviceMapping', ['/ dev / sda1'])  (lack of  = 0  in the string) did not make any changes.  
  2.   .block_device_mapping ['/ dev / sda1'] to perform the installation. Delete_on_termination  also did not make any changes. After calling   
     
      modify_attribute , the value is unchanged at  delete_on_termination  on the local block device objects.  
     
     I walk through the whole process here:

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