Логические значения и битовые операции

1.3.1.py

# -*- encoding: utf-8 -*-
"""
Единица - это истина
"""

if 1:
     print 'true'

if not 1:
     print 'true'
else:
     print 'false'

1.3.2.py

# -*- encoding: utf-8 -*-
"""
Что есть истина
"""

#      0 is false; all other numbers are true.
print 'true' if 0 else 'false'

#      An empty string ("") is false, all other strings are true.
print 'true' if "" else 'false'

#      An empty list ([]) is false; all other lists are true.
print 'true' if [] else 'false'

#      An empty tuple (()) is false; all other tuples are true.
print 'true' if () else 'false'

#      An empty dictionary ({}) is false; all other dictionaries are true.
print 'true' if {} else 'false'

1.3.3.py

# -*- encoding: utf-8 -*-
"""
Число
"""

a = 0 
if a:
   print "Here" 

a = 2

if a:
   print "There"     

1.3.4.py

# -*- encoding: utf-8 -*-
"""
Сложный тип
"""

if []:
   print "empty." 

if [1]:
   print "not empty." 

if ():
   print "empty." 

if (1):
   print "not empty." 

if {}:
   print "empty." 

if {1:0}:
   print "not empty." 

1.3.5.py

# -*- encoding: utf-8 -*-
"""
Побитовое ИЛИ
"""

x = 1        # 0001

x | 2        # bitwise OR: 0011

print x

1.3.6.py

# -*- encoding: utf-8 -*-
"""
Побитовое И
"""

x = 1        # 0001

x & 1        # bitwise AND: 0001

print x

1.3.7.py

# -*- encoding: utf-8 -*-
"""
Побитовый сдвиг
"""

x = 1        # 0001
x << 2       # shift left 2 bits: 0100
print x