# 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!:

Example for versions Python 2.5.2
``````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())
``````

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