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(Chilkat2-Python) Check if Integer Exists at JSON PathDemonstrates how to get an integer value at a JSON path, and how to check to see if it exists.
import chilkat2 json = chilkat2.JsonObject() # First build simple JSON.. json.UpdateInt("test.abc",100) json.EmitCompact = False print(json.Emit()) # This is our JSON: # { # "test": { # "abc": 100, # } # } path = "test.notHere" # The call to IntOf will return 0, because it's not present. # But how do we know if it really was present, and the value was truly 0? val = json.IntOf(path) print("val = " + str(val)) # We cannot use LastMethodSuccess because LastMethodSuccess only applies # to methods that: # - return a string # - return a new Chilkat object, binary bytes, or a date/time. # - returns a boolean status where True = success and False = failed. # - returns an integer where failure is defined by a return value less than zero. # The IntOf method fits none of these requirements, and therefore the LastMethodSuccess # is not a valid indicator.. wasFound = json.LastMethodSuccess print("wasFound = " + str(wasFound) + " (not a valid indicator)") # Instead, if the returned value is 0, we can double-check to see if the member was truly there.. if (val == 0): wasFound = json.HasMember(path) print("wasFound = " + str(wasFound)) if (wasFound == True): print("The value was present and is 0.") else: print("no member is present at test.notHere") else: print("val = " + str(val)) # Alternatively, you could check to see if the member exists beforehand.. if (json.HasMember(path) == True): print("val = " + str(json.IntOf(path))) else: print("no member at " + path) |
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