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fibonacci.py
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fibonacci.py
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"""
The fibonacci sequence can be generated using different programming techniques.
The following is a sample that will be helpful in understanding certain programming
concepts.
"""
def fib_reg(number):
"""
Method: Iteration
:param number:
:return: List of fibonacci numbers
"""
previous_num = 0
current_num = 1
fiblist = [previous_num, current_num]
for i in range(number):
current_num, previous_num = (current_num + previous_num), current_num
fiblist.append(current_num)
return fiblist
print("\nPrinting results for fib_reg, the regular, iterative function")
print(fib_reg(9))
def fib_rec(n):
"""
Method: Recursion
:param n:
:return: Returns the nth number in fibonacci series
"""
if n < 0:
raise ValueError('input can\'t be negative')
elif not isinstance(n, int):
raise TypeError('input has to be an int')
elif n == 0:
return 0
elif n == 1:
return 1
else:
return fib_rec(n-1) + fib_rec(n-2)
print("\nPrinting results for fib_rec, the recursive function")
check = fib_rec(12)
print(check)
# Use the for loop to generate a series
#for i in range(8):
# print(fib_rec(i))
def fib_gen():
"""
Method: Generator
Yield statement is immediately recognized by the computer
and it treats this code as a Generator. One cannot have
return and yield statements in the same function.
.next() in the for loop is another special call that the
generator recognizes
:return:
"""
first_no = 0
second_no = 1
yield first_no
while True:
yield second_no
second_no, first_no = second_no + first_no, second_no
print("\nPrinting results for fib_gen, the generator function that has a yield statement")
gen_ans = fib_gen()
for i in range(6):
print(gen_ans.next())