[Python] AttributeError: 'str' object has no attribute 'show' PySpark

AttributeError: 'str' object has no attribute 'show'

I am trying to pass any test json file as part of the command line argument. When doing so it treats it as a string , which I dont want but I want it to be treated as a DataFrame so it can show the dataframe with df.show(). I get this error message on the terminal saying AttributeError: 'str' object has no attribute 'show’.

df = sqlContext.read.json(“tester.json")

def show_data(df):
df.show()

parser = argparse.ArgumentParser()
parser.add_argument(‘-I’, ‘—inputfile', required=True , default =df)
args = parser.parse_args()
show_data(args.parameterfile)

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