#!/usr/bin/env python
# coding: utf-8

# In[1]:


def foo(a, b):
    global c
    
    print '1', a, b
    a = 'yes'
    b = 'yes yes'
    #print '1.5', c
    c = 'maybe'
    print '1.6', c
    print '2', a, b


# In[2]:


c = 'no'
d = 'nono'


# In[3]:


print '3', c, d
foo(c, d)
print '4', c, d


# In[4]:


import datetime


# In[5]:


def goo(a=datetime.datetime.now):
    try:
        b = a()
    except TypeError:
        b = a
    print 'a is', repr(a), 'b is', b


# In[6]:


goo()


# In[7]:


goo('world')


# In[8]:


goo(5)


# In[9]:


goo({'hello': 'world'})