python学习第三天

摘要: 继续学习
参考在线文档http://www.runoob.com/python/python-while-loop.html

#!/usr/bin/python

#filename:test3.py

a = 21

b = 10

c = 0

#part one : assignment operator

c = a + b

print ("Line 1 - Value if c is ",c)

c += a

print ("Line 2 - Value of c is ",c)

c *= a

print ("Line 3 - Value of c is ",c)

c /= a

print ("Line 4 - Value of c is ",c)

c = 2

c %= a

print ("Line 5 - Value of c is ",c)

c **=a

print ("Line 6 - Value of c is ",c)

c //=a

print ("Line 7 -Value of c is",c)

# part two : bit operator

a = 60

b = 13

c = 0

c = a & b

print ("Line 1 - Value of c is ",c)

c = a | b

print ("Line 2 - Value of c is ",c)

c = a ^ b

print ("Line 3 - Value of c is ",c)

c = ~a

print ("Line 4 - Value of c is ",c)

c = a << 2

print ("Line 5 - Value of c is ",c)

c = a >> 2

print (" Line 6 - Value of c is ",c)

#part three : logical operator

a = 10

b = 20

c = 0

if( a and b ):

print ("Line 1 - a and b are true ")

else :

print ("Line 1 - ether a or b is not true ")

if( a or b ):

print ("Line 2 - at least one of them is true ")

else :

print ("Line 2 - Neither a nor b is true")

a = 0

if( a and b ):

print ("Line 3 - a and b are true")

else:

print ("Line 3 - either a or b is not true")

if not( a and b):

print ("Line 5 - either a or b is not true")

else :

print ("Line 5 - a and b are true")

# part four

a = 20

b = 20

if( a is b):

print ("Line 1 - a and b have same identity")

else:

print ("Line 1 - a and b do not have same identity")

if( id(a) == id(b)):

print ("Line 2 - a and b have same identity")

else:

print ("Line 2 - a and b do not have same identity")

b = 30

if( a is b):

print ("Line 4 - a and b do not have same identity")

else:

print ("Line 4 - a and b do not have same identity")

if(a is not b ):

print ("Line 4 - a and b do not have same identity")

else:

print("Line 4 - a and b have the same identity")

#PART FIVE

a = 20

b = 10

c = 15

d = 5

e = 0

e = ( a + b )*c/d

print ("value of (a + b) * c / d is ",e)

e = ((a + b ) * c)/d

print ("value of ((a+b)*c)/d is ",e)

e = ( a + b) * (c / d)

print ("value of ( a + b) * (c/d) is ",e)

e = a + (b * c) /d

print ("Value of a + ( b * c)/d is ",e)

#PART SIX

num = 5

if num == 3:

print ("boss")

elif num == 2:

print ("user")

elif num ==1:

print ("worker")

elif num < 0 :

print ("error")

else:

print ("roadman")

num = 9

if num >= 0 and num <= 10:

print ("hello")

else:

print ("undefine")

if(num >=0 and num <= 5) or (num >= 10 and num <= 15):

print ("hello")

else:

print ("undefine")