12.- Add if __name__ == '__main__':
12.- Add if __name__ == '__main__':
Some PEP-8 details:
1.- According PEP-8 between each function you have to have two blank lines.
2.- Space between parameters (ie def check_fermat(a, b, c, n): instead of def check_fermat(a,b,c,n):. Source
3.- End of file it should be an new empty line.
4.- There is an extra space between print and ("Not a string, a number please.")
Related with the code;
5.- Instead of checking for 'y' or 'Y' you can apply lowercase to user input ( if str.lower(prompt) == "y":)
6.- a = int(a) is redundant, same for b, c and n.
7.- According your code n it should be higher than 2, is this correct?
8.- You are repeating the user input code, you should create a new function for that.
9.- Check fermat should just do that, so, program_restart should be handled in another place.
10.- That return on program_restart is unnecessary.
11.- If inside program_restart you have another call to user_input and inside this second user_input another call to program_restart and so on.. (You are falling into a recursion. Recursion per se is not bad, but in this case it is because you are trying to just repeat the program, no to solve some problema trough recursion), a better approach is control that with a loop.
12.- Add if __name__ == '__main__':
def program_restart():
print("Would you like to try again? ")
prompt = input("type 'Y' to continue or any other character to exit:\n")
return str.lower(prompt) == "y"
def check_fermat(a, b, c, n):
if a ** n + b ** n == c ** n:
print("Holy Smokes, Fermat was wrong!")
else:
print("No, that does not work!")
print("---------------------------")
def ask_number(text, bigger_than=0):
number = bigger_than - 1
while number <= bigger_than:
try:
number = int(input(text))
except ValueError:
print("Please write a valid number.")
return number
def user_input():
run_program = True
while run_program:
print("Let's see if Fermat was right. He claims that a^n+b^n=c^n cannot be True!")
a = ask_number(text='Give a positive number bigger than 2 for "a":\n', bigger_than=2)
b = ask_number(text='Give a positive number bigger than 2 for "b":\n', bigger_than=2)
c = ask_number(text='Give a positive number bigger than 2 for "c":\n', bigger_than=2)
n = ask_number(text='Give a positive number for the exponent "n":\n')
check_fermat(a, b, c, n)
run_program = program_restart()
if __name__ == '__main__':
user_input()