Stack Overflow Asked on December 23, 2021
I’m new to this so I apologize for any of my mistakes.
This is my code:
def main():
global user_input
user_input = [0,1,2]
final = fibonacci(user_input)
return final
def append_fibonacci(integer_list):
new_list = []
while integer_list[1] < 40:
integer_list[0], integer_list[1] = integer_list[1], integer_list[0]+integer_list[1]
new_list.append(integer_list[0])
return(new_list)
def fibonacci(max):
final = append_fibonacci(max)
print("Enter a non-negative integer >")
print("The Fibonacci series starts with:",final)
My error is the outcome only prints:
The Fibonacci series starts with: [1, 1, 2, 3, 5, 8, 13, 21, 34]
When it’s suppose to print whatever other inputs (such as inputs: 8 / outputs: The Fibonacci series starts with: [1, 1, 2, 3, 5, 8] , inputs: 0 / outputs: The Fibonacci series starts with: [], inputs: 1 / Output: The Fibonacci series starts with: [1, 1] & inputs: six / Output: six is not a non-negative integer ).
I’m unsure if and where to use the (if, else statements) and if to check if it (.isdigit) or (isinstance, str).
Can someone help me or give me the answer? Thank you for your time in assisting me.
This is the question below.
The main function must input a string. If the string does not represent a non-negative integer, then it should print a warning message. If it does represent a non-negative integer, then it should call the fibonacci function to create the list of Fibonacci numbers that are less than or equal to the non-negative integer and output this list. The fibonacci function should call the append_fibonacci function multiple times to create the Fibonacci list.
If you use a function from an imported module in your function, you must import that module inside your function.
def main():
user_input = input("Enter a non-negative integer >")
try:
if int(user_input) < 0:
print('{} is not a non-negative integer'.format(user_input))
else:
final = fibonacci(int(user_input))
print("The Fibonacci series starts with:", final)
except ValueError:
print('{} is not a non-negative integer'.format(user_input))
def append_fibonacci(integer_list):
if len(integer_list) < 2:
integer_list.append(1)
else:
integer_list.append(integer_list[-1] + integer_list[-2])
return integer_list
def fibonacci(max):
integer_list = []
if max == 0:
return integer_list
else:
while len(integer_list) < 2 or integer_list[-1] + integer_list[-2] <= max:
integer_list = append_fibonacci(integer_list)
return integer_list
Answered by Mark on December 23, 2021
The first problem is with this statement while integer_list[1] < 40. Independent of the input you pass to the function it will output Fibonacci numbers less than 40. Second problem is the user_input list you pass through functions which is completely unnecessary. You just need to pass max number and your program will output Fibonacci numbers less than or equal to max. Third problem is you do not have a mechanism to check whether the input is a valid non-negative integer.
Here is the code:
def main():
_max = ""
while not _max.isnumeric():
_max = input("Enter a non-negative integer >")
_max = int(_max)
final = append_fibonacci(max)
print("The Fibonacci series starts with:",final)
return final
def append_fibonacci(_max):
if _max==0:
return []
fibonacci = []
x=1
y=1
while y <= _max:
x, y = y, x+y
fibonaccis.append(x)
return fibonacci
main()
Answered by taha on December 23, 2021
Get input from users, you should use input() method. In main() function, user_input = input("Enter a non-negative integer >") will work. Also avoid using global variables. You don't need input variable as a global variable in this code, simply delete that line.
Use int() to check if the input is integer or not. You can handle the error message using try...except. Use if...else to check if the number negative or not.
Your code should look something like this:
def main():
user_input = input("Enter a non-negative integer > ")
try:
if int(user_input) < 0:
print('{} is not a non-negative integer'.format(user_input))
else:
final = fibonacci(int(user_input))
print("The Fibonacci series integer_lists with: ", final)
except ValueError:
print('"{}" is not a non-negative integer'.format(user_input))
def append_fibonacci(integer_list):
if len(integer_list) < 2:
integer_list.append(1)
else:
integer_list.append(integer_list[-1] + integer_list[-2])
return integer_list
def fibonacci(max):
integer_list = []
if max == 0:
return integer_list
else:
while len(integer_list) < 2 or integer_list[-1] + integer_list[-2] <= max:
integer_list = append_fibonacci(integer_list)
return integer_list
Answered by eren on December 23, 2021
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