Issue with matplotlib in Python

Question

I am working on a small practice program to get better with python and the matplotlib module. This program has no real world uses, I just wanna understand where i went wrong

    import matplotlib.pyplot as plt
def main():
    getTotal()
def getTotal():
    BTC=int(input('How much would you like to allocate to BTC as a percentage: '))
    ETH=int(input('How much would you like to allocate to ETH as a percentage: '))
    LTC=int(input('How much would you like to allocate to LTC as a percentage: '))
    values=[BTC,ETH,LTC]
    if BTC+ETH+LTC>100:
        print('That was too much, try again')
        getTotal()
        del values
    slices=[BTC,ETH,LTC]
    plt.pie(values,labels=slices)
    plt.title('Crypto Allocations')
    plt.show()
main()

and it is throwing this error

 File "C:/Users/Liam/ranodm.py", line 30, in getTotal
    plt.pie(values,labels=slices)

UnboundLocalError: local variable 'values' referenced before assignment

If you call values after del values is evaluated you get UnboundLocalError because values is no more... — Paulo Scardine
– Paulo Scardine, Commented Mar 23, 2018 at 0:48
@PauloScardine has the point: "values" is no more in the scope of your function because you applied del before calling the plot. — Alejandro Carrera
– Alejandro Carrera, Commented Mar 23, 2018 at 3:14
@PauloScardine was also correct, i fixed that then got to the answer i marked as correct below when that error occured — Liam O'Toole
– Liam O'Toole, Commented Dec 23, 2020 at 1:37

Ricardo Faria · Accepted Answer · 2018-03-23 01:10:33Z

2

In the documentation the values you're passing in the label parameter have to be A sequence of strings providing the labels for each wedge. So, the value of slices has to be slices=['BTC','ETH','LTC'].

import matplotlib.pyplot as plt
def main():
    getTotal()
def getTotal():
    BTC=int(input('How much would you like to allocate to BTC as a percentage: '))
    ETH=int(input('How much would you like to allocate to ETH as a percentage: '))
    LTC=int(input('How much would you like to allocate to LTC as a percentage: '))
    if BTC+ETH+LTC>100:
        print('That was too much, try again')
        getTotal()
    else:
        values=[BTC,ETH,LTC]
        slices=['BTC','ETH','LTC'] #I assume that you want strings here
        plt.pie(values,labels=slices)
        plt.title('Crypto Allocations')
        plt.show()
main()

edited Mar 23, 2018 at 1:10

Ricardo Faria

79415 silver badges31 bronze badges

answered Mar 23, 2018 at 0:56

DZurico

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