function default value (Python vs Ruby)

function_default_value_python.py

#!/usr/bin/env python

'''
[haruna@haruna test ]$ ./function_default_value_python.py
2015-11-24 11:16:47.815578
2015-11-24 11:16:47.815578

same
'''

import time
import datetime

def print_now(now = datetime.datetime.now()):
    print(now)

print_now()
time.sleep(5)
print_now()

function_default_value_ruby.rb

#!/usr/bin/env ruby

=begin
[haruna@haruna test ]$ ./function_default_value_ruby.rb
2015-11-24 11:17:20 +0900
2015-11-24 11:17:25 +0900

not same
=end

def print_now(now = Time.now())
  puts now
end

print_now
sleep 5
print_now