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NameError: name 'countryDat' is not defined - Printable Version

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+--- Thread: NameError: name 'countryDat' is not defined (/Thread-NameError-name-countryDat-is-not-defined)



NameError: name 'countryDat' is not defined - alien748 - Aug-27-2017

Hey, so I'm new to Python and I attempted to practice what I learned from tutorials by making a program that gives you how many years you have to live based on life expectancy in a country, your age, and if you smoke or not. I use Python 3.6.2 in PyCharm.

def calc_life(age, country, smoke):
    '''
    I made a list of three countries and another with their life expectancy average. I also make a counter 'y'
    to use in the 'for x in countryList' loop.
    '''
    countryTime = [75, 85, 90]
    countryList = ["Mexico", "US", "Canada"]
    global countryDat, smokeDat
    y = 0

    for x in countryList:       #This loop gets the life expectancy of the country. The result is 'countryDat'
        if x is country:
            countryDat = countryTime[y]
        else:
            y = y + 1

    if smoke is "Yes":          #This loop is to assign a value to smokeDat depending if the person smokes
        smokeDat = -10
    elif smoke is "No":
        smokeDat = 0

    time = (countryDat - age) + smokeDat    #This just adds the previous results to get the remaning expected years of the person
    return time

#This just asks the user the info needed for the 'calc_life' funcion
print("How old are you?")
age = int(input())
print("In what country do you live? (Mexico, US, or Canada)")
country = input()
print("Do you smoke?")
smoke = input()

result = calc_life(age, country, smoke)

print(result)
I get the following when I run it:
How old are you?
33
In what country do you live? (Mexico, US, or Canada)
US
Do you smoke?
No
Traceback (most recent call last):
  File "C:/Users/josea/PycharmProjects/untitled/asdf.py", line 33, in <module>
    result = calc_life(age, country, smoke)
  File "C:/Users/josea/PycharmProjects/untitled/asdf.py", line 22, in calc_life
    time = (countryDat - age) + smokeDat    #This just adds the previous results to get the remaning expected years of the person
NameError: name 'countryDat' is not defined

Process finished with exit code 1
I've searched for solutions on the web and spent hours trying to find out what was wrong, but either they didn't work or solved the NameError and made another error appear. Thanks in advance.


RE: NameError: name 'countryDat' is not defined - ichabod801 - Aug-27-2017

This line is probably tripping you up:

if x is country:
The is operator is not the same as equals. It means that both variables point to the same place in memory, that they are not only equal, but that they are the exact same thing. Try:

if x == country:
instead. Also, it would work better to use a dictionary for that information. If you haven't studied those yet, look them up. I believe there's a tutorial on them in the tutorials section of this site.


RE: NameError: name 'countryDat' is not defined - alien748 - Aug-27-2017

Thanks! I can't believe I spent hours trying to figure it out while the mistake was so small...


RE: NameError: name 'countryDat' is not defined - ichabod801 - Aug-27-2017

(Aug-27-2017, 08:59 PM)alien748 Wrote: Thanks! I can't believe I spent hours trying to figure it out while the mistake was so small...

Welcome to computer programming.