Unbound local error when writing nested codes - python-3.x

Question

I’m trying to tweak the subfile on my python but it keeps showing me an unboundlocalerror on the a variable (Min_Alpha) which was referenced earlier on. I am confused by this as if I run the alpha command I get no errors though when I run the beta command I get this error. Any help would be much appreciated.
def main():
print("Welcome to the Beta Distribution Software")
print(" ")
playerschoice = input("Do you want to use this software ? Yes/No : ")
if (playerschoice == "yes" or playerschoice =="Yes" or playerschoice == "YES"):
Body_function_01()
else:
end_program()
def Body_function_01():
users_choice = input("What constant would you like to vary ? Alpha/Beta: ")
if (users_choice == "Alpha" or users_choice == "alpha"):
Max_Alpha = float(input("Enter the Maximum Alpha Value: "))
Min_Alpha = float(input("Enter the Minimum Alpha Value: "))
Alpha_increment = float(input("Enter Alpha Increment Value: "))
Beta_constant = float(input("Enter constant Beta value"))
else:
Body_function_02()
if (Min_Alpha >= 0):
print("Minimum Alpha value is within an acceptable range")
elif (Min_Alpha < 0):
print("Minimum value of alpha is too low ")
print ("Try again")
if ((Max_Alpha - Min_Alpha) > Alpha_increment):
print("The Alpha Increment is within an acceptable range")
elif ((Max_Alpha - Min_Alpha) < Alpha_increment):
print("The Alpha increment is too high")
print("Try again")
if (Max_Alpha > Min_Alpha):
print("The Maximum value of alpha is within an acceptable range")
elif (Max_Alpha < Min_Alpha):
print("The maximum value of alpha is too high")
print("Try again")
def Body_function_02():
users_choice = input("What constant would you like to vary ? Alpha/Beta: ")
if (users_choice == "Beta" or users_choice == "beta"):
Max_Beta = float(input("Enter the Maximum Beta Value: "))
Min_Beta = float(input("Enter the Minimum Beta Value: "))
Beta_increment = float(input("Enter Beta Increment Value: "))
Alpha_constraint = float(input("Enter constant Alpha value: "))
else:
print("Try again")
if (Min_Beta >= 0):
print("Minimum Beta value is within an acceptable range")
elif (Min_Beta < 0):
print("Minimum value of Beta is too low ")
print ("Try again")
if ((Max_Beta - Min_Beta) > Beta_increment):
print("The Beta Increment is within an acceptable range")
elif ((Max_Beta - Min_Beta) < Beta_increment):
print("The Beta increment is too high")
print("Try again")
if (Max_Beta > Min_Beta):
print("The Maximum value of Beta is within an acceptable range")
elif (Max_Beta < Min_Beta):
print("The maximum value of Beta is too high")
print("Try again")
def end_program():
print(" ")
input("Press any key to leave")
sys.exit()
main()
Body_function_01()
Body_function_02()
end_program().
---------------------------------------------------------------------------
UnboundLocalError Traceback (most recent call last)
<ipython-input-25-c662d0a92b77> in <module>
111
112
--> 113 main()
114 Body_function_01()
115 Body_function_02()
<ipython-input-25-c662d0a92b77> in main()
16 playerschoice = input("Do you want to use this software ? Yes/No : ")
17 if (playerschoice == "yes" or playerschoice =="Yes" or playerschoice == "YES"):
---> 18 Body_function_01()
19
20 else:
<ipython-input-25-c662d0a92b77> in Body_function_01()
33 Body_function_02()
34
---> 35 if (Min_Alpha >= 0):
36 print("Minimum Alpha value is within an acceptable range")
37 elif (Min_Alpha < 0):
UnboundLocalError: local variable 'Min_Alpha' referenced before assignment

Answer 1

I think the problem is that Min_Alpha is initialised in this if:
users_choice = input("What constant would you like to vary ? Alpha/Beta: ")
if (users_choice == "Alpha" or users_choice == "alpha"):
Max_Alpha = float(input("Enter the Maximum Alpha Value: "))
Min_Alpha = float(input("Enter the Minimum Alpha Value: "))
Alpha_increment = float(input("Enter Alpha Increment Value: "))
Beta_constant = float(input("Enter constant Beta value"))
Which mins it will be initialised only if user choices Alpha/alpha. For any other choice the variable will not be initialised and it will be unbounded when you compare it to 0. Not sure what is the expected behaviour but i think you should return on the else case in both Body_function_01 and Body_function_02 functions.