Instruction.is_storage_read()

Returns True if the instruction is a storage read instruction, else returns False. A storage read instruction just reads the value of a state variable without making any changes to it

Query

from glider import *
def query():
  #fetch a list of instructions
  instructions = Instructions().exec(1,36) 
  for instruction in instructions:
   #print the source code of the instruction
    print(instruction.source_code())
    #prints True/False depending on whether the instruction is a storage read 
    #instruction or not
    print(instruction.is_storage_read())
  return []

Output

{"print_output": 
	[
		"return _balances[owner]", 
		"True"
	]
}

In the output above, the instruction only reads the _balances mapping, hence True is returned