Examples
I will start a series of posts with some examples to develop with the Python programming language.
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The first problem to solve will be:
Python example 1
Print on screen the first 20 numbers of the Fibonacci sequence.
The Fibonacci sequence is made up of a function in which each element is the sum of the two previous numbers
The sequence begins with 0,1,1,2 …
Solution:
The sequence can be expressed with a recursive function
fibon (n) = fibon (n-1) + fibon (n-2)
# Example python 1
# Fibonacci sequence of the first 20 numbers
# fibon(n) = fibon(n-1)+fibon(n-2)
def fibon(n):
if n<=2:
return n
return fibon(n-1)+fibon(n-2)
if __name__ == "__main__":
cad=""
for i in range(20):
cad= cad+" "+str(fibon(i))
print "Fibonacci sequence "+cad
Python 2 example
Print the factorial of the numbers from 1 to 10 on the screen
The factorial of a number is calculated as the product of all the numbers before it.
The factorial of 0 is 1
Factorial pe of 3 = 3 * 2 * 1
You will have to make two versions, one with a loop and the other with a recursive function.
# Example python 2
# recursive version
# Factorial of the numbers from 1 to 10
# factorial(n) = factorial(n-1)*n
#
def factorial(n):
if n==0:
return 1
if n==1:
return 1
return factorial(n-1)*n
if __name__ == "__main__":
for i in range(10):
print "Factorial " + str(i) + " " + str(factorial(i))
# Example python 2
# Factorial of the numbers from 1 to 10
# with loops
if __name__ == "__main__":
for i in range(10):
f=1
for n in range(1,i):
f=f*n
print "Factorial " + str(i) + " " + str(f)
