CPython

Implementation of programming language Python

CPython is the default, most-widely used implementation of the Python programming language. It is written in C.

CPython is a bytecode interpreter.

Examples:

Hello, World!:

print "Hello, World!"

Factorial:

Example for versions Python 2.5.2, Python 2.6.5

This example uses recursive factorial definition.

def factorial(n):
 if n == 0:
 return 1
 else:
 return n * factorial(n - 1)
for n in range(16 + 1):
 print "%d! = %d" % (n, factorial(n))

Fibonacci numbers:

Example for versions Python 2.5.2, Python 2.6.5

This example uses recursive definition of Fibonacci numbers.

#! /usr/bin/env python
def fibonacci(n):
 if n < 3:
 return 1
 else:
 return fibonacci(n - 1) + fibonacci(n - 2)
for n in range(1, 16 + 1):
 print "%i," % fibonacci(n) ,
print "..."

Factorial:

Example for versions Python 2.5.2, Python 2.6.5

This example uses iterative method of calculating factorials.

def factorial(n):
 if n == 0:
 return 1
 
 f = 1
 for i in range(1, n + 1):
 f *= i
 return f
for n in range(16 + 1):
 print "%d! = %d" % (n, factorial(n))

Quadratic equation:

Example for versions Python 2.6.5

import math
import sys
A = float(raw_input("A = "))
if A == 0:
 print "Not a quadratic equation"
 sys.exit()
B = float(raw_input("B = "))
C = float(raw_input("C = "))
D = B * B - 4 * A * C
if D == 0:
 print "x =", -B / 2.0 / A
 sys.exit()
if D > 0: 
 print "x1 =", (-B + math.sqrt(D)) / 2.0 / A
 print "x2 =", (-B - math.sqrt(D)) / 2.0 / A
else:
 print "x1 = (", -B / 2.0 / A, ",", math.sqrt(-D) / 2.0 / A, ")"
 print "x2 = (", -B / 2.0 / A, ",", -math.sqrt(-D) / 2.0 / A, ")"

CamelCase:

Example for versions Python 2.6.5

The program uses Python standard library functions translate and title.

title counts all non-letters as word delimiters, so no need to change them to spaces before calling title.

non_letters = ''.join(c for c in map(chr, range(256)) if not c.isalpha())
def camel_case(s):
 return s.title().translate(None, non_letters)
print camel_case(raw_input())

CPython

Links:

Examples:

Hello, World!:

Factorial:

Fibonacci numbers:

Factorial:

Quadratic equation:

CamelCase:

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