Fibonacci series using loop and recursive functions in Python

In Fibonacci series of numbers, each number is the sum of the two preceding ones.

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377

Fn = F(n-1) + F(n-2)

Fibonacci series of numbers by using loop and by recursive functions in Python

Generating Fibonacci Series

We will use while loop

n=15 # number of elements 
i=0  # counter 
n1=1 # One before
n2=0 # two before
while( i<n):
  print(n2, end=', ')
  temp=n1+n2
  n1=n2
  n2=temp
  i = i+1

Output

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377,

Using For loop

By using this line we are removing the temp variable.

n1,n2=n2,(n1+n2)

Full code is here

n=15 # number of elements 
n1,n2,i=1,0,0 # Setting the values 
for i in range( 0,n): # 
  print(n2, end=', ')
  n1,n2=n2,(n1+n2) # change the values

Fibonacci series using recursive functions

Using recursive function

def feb(n):
  if(n<=1):
    return n
  else:
    return ((feb(n-1)+feb(n-2)))
for i in range(0,15):
  print(feb(i), end=', ')

Output

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377,

Generate Fibonacci Sequence Up to a Limit Using a Generator

More on Python Generator by using yield

# Define a function to generate Fibonacci numbers up to a certain limit
def fibonacci(limit):
    a, b = 0, 1  # Initialize the first two Fibonacci numbers
    while a < limit:  # Continue generating numbers while 'a' is less than the limit
        yield a  # Yield the current Fibonacci number
        a, b = b, a + b  # Update 'a' and 'b' to the next Fibonacci numbers

# Create a Fibonacci generator object with numbers up to 100
fib = fibonacci(100)

# Iterate through the generated Fibonacci numbers and print them
for num in fib:
    print(num)

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Fibonacci numbers in Python

Generating Fibonacci Series

Using For loop

Fibonacci series using recursive functions

Generate Fibonacci Sequence Up to a Limit Using a Generator

Subhendu Mohapatra