Example 006: Fibonacci series

example 006： Fibonacci sequence

subject ： Fibonacci sequence . Output Fibonacci sequence of a given number .

# Topic analysis ： Fibonacci sequence （Fibonacci sequence）, from 1,1 Start , Each of the latter is equal to the sum of the first two .

# Program analysis ： We can define a list to store Fibonacci series , According to the law of Fibonacci sequence , From 3 A start , Each item is the sum of the first two items , Get the sum of the first two items and store it in the sequence .

#  When you first enter  i=0 When ,a=1,b=a+b=2,
 When i=1 when ,a=2,b=a+b=3, When i=2 when ,a=3,b=a+b=5,·······

list_fib = [1]  #  Define a list to store Fibo's number series , Initialize the value of the first element as 1

target = int(input(" Enter the perbonacci sequence of the first few items you want "))
res = 0
a, b = 1, 1

for i in range(target - 1):
    a, b = b, a + b
    list_fib.append(a)

print(list_fib)

Add the above paragraph to the cycle, and we can test it many times to see the effect ：

for j in range(5):

    list_fib = [1]  #  Define a list to store Fibo's number series , Initialize the value of the first element as 1

    target = int(input(" Enter the perbonacci sequence of the first few items you want "))
    res = 0
    a, b = 1, 1

    for i in range(target - 1):
        a, b = b, a + b
        list_fib.append(a)

    print(list_fib)