fibonacci sequence generator python

1#Python program to generate Fibonacci series until 'n' value
2n = int(input("Enter the value of 'n': "))
3a = 0
4b = 1
5sum = 0
6count = 1
7print("Fibonacci Series: ", end = " ")
8while(count <= n):
9  print(sum, end = " ")
10  count += 1
11  a = b
12  b = sum
13  sum = a + b
14

1# WARNING: this program assumes the
2# fibonacci sequence starts at 1
3def fib(num):
4	"""return the number at index `num` in the fibonacci sequence"""
5    if num <= 2:
6        return 1
7    return fib(num - 1) + fib(num - 2)
8
9# method 2: use `for` loop
10def fib2(num):
11	a, b = 1, 1
12	for _ in range(num - 1):
13		a, b = b, a + b
14	return a
15
16
17print(fib(6))  # 8
18print(fib2(6))  # same result, but much faster

1# This program also assumes the fibonacci sequence starts at 1 
2# This code will print as many digits as the user wishes
3# Instead of printing a specific number in the sequence 
4def fibonacci(digits):
5
6    digit1, digit2 = 1, 1
7    amount_of_digits = 0 
8    print(str(digit1) + ", " + str(digit2) + ', ', end='')
9
10    while amount_of_digits != digits:
11        digit1, digit2 = digit2, digit1 + digit2 
12        print(str(digit2) + ", ", end='') # we want to print on the same line
13        amount_of_digits = amount_of_digits + 1 
14
15        if amount_of_digits == digits:
16            print('\n') 
17            print('Loop done.')
18            break
19
20fibonacci(10) # this will print the first 10 digits in the sequence

1#Learnprogramo
2Number = int(input("How many terms? "))
3# first two terms
4First_Value, Second_Value = 0, 1
5i = 0
6if Number <= 0:
7print("Please enter a positive integer")
8elif Number == 1:
9print("Fibonacci sequence upto",Number,":")
10print(First_Value)
11else:
12print("Fibonacci sequence:")
13while i < Number:
14print(First_Value)
15Next = First_Value + Second_Value
16# update values
17First_Value = Second_Value
18Second_Value = Next
19i += 1