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api key issue

import quandl
import pandas as pd

api_key = open('qevSMqq_UjPzHaAQPNxt','r').read()
#quandl.ApiConfig.api_key = "qevSMqq_UjPzHaAQPNxt"
#mydata = quandl.get("FRED/GDP")


main_df = pd.DataFrame()
               

fiddy_states = pd.read_html('https://simple.wikipedia.org/wiki/List_of_U.S._states')

for abbv in fiddy_states[0][0][1:]:
    query= "FMAC/API_"+str(abbv)
    df = quandl.get(query, authtoken=api_key)  

    if main_df.empty:
        main_df = df

    else:
        main_df = main_df.join(df)

print(main_df.head)


Then I get an error message like so
Traceback (most recent call last):
  File "C:UsersstephenAppDataLocalProgramsPythonPython35ng.py", line 5, in <module>
    api_key = open('qevSMqq_UjPzHaAQPNxt','r').read()
FileNotFoundError: [Errno 2] No such file or directory: 'qevSMqq_UjPzHaAQPNxt'

I also tried making text file in working directory with api_key in it. Please let me know what Im doing wrong. thanks