[Python] Key Error 'Main' when trying an openweathermap python api tutorial

I'm currently trying to run through a tutorial of how to set up openweathermap via Python but i'm getting a KeyError and I was wondering if someone could help me out.

The error I am getting is KeyError: 'main'

In the actual code I have put in my API but have taken it out for obvious reasons.

api_key = ""
base_url = "http://api.openweathermap.org/data/2.5/weather?"

city_name = input("Enter city name : ")

complete_url = base_url + "appid=" + api_key + "&q=" + city_name

response = requests.get(complete_url)

x = response.json()

if x["cod"] != "404":

y = x["main"]

current_temperature = y["temp"]
current_pressure = y["pressure"]
current_humidiy = y["humidity"]

z = x["weather"]

weather_description = z[0]["description"]

print(" Temperature (in kelvin unit) = " +
str(current_temperature) +
"\n atmospheric pressure (in hPa unit) = " +
str(current_pressure) +
"\n humidity (in percentage) = " +
str(current_humidiy) +
"\n description = " +
str(weather_description))
else:
print(" City Not Found ")

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