CHAPTER 9: PUPPETTING ON STRINGS

EXAMPLE ON PAGE:311

In [4]:
 
name="Klinsman"
i=0
while i<=7:
    print "%c" % (name[i]),                                  #method of printing without line feed
    i+=1
print "\n"

K l i n s m a n

EXAMPLE ON PAGE:311-312

In [14]:
 
name="Klinsman "
i=0
while name[i]!=' ':
    print "%c" % (name[i]), 
    i+=1
print "\n"

 K l i n s m a n

EXAMPLE ON PAGE:312

In [18]:
 
name="Klinsman "
ptr=[]
ptr=name                                        #store base address of string
i=0
while name[i]!=' ':
    print "%c" % (ptr[i]), 
    i+=1
print "\n"

K l i n s m a n

EXAMPLE ON PAGE:313

In [19]:
 
name="Klinsman"
print "%s" % (name)

Klinsman

EXAMPLE ON PAGE:313

In [20]:
 
print "Enter your name"
name=raw_input()
print "Hello %s!\n" % (name)

Enter your name
Debashish
Hello Debashish!

EXAMPLE ON PAGE:314

In [21]:
 
print "Enter your full name:"
name=raw_input()
print "Hello!"
print name

Enter your full name:
Debashish Roy
Hello!
Debashish Roy

EXAMPLE ON PAGE:315

In [6]:
 
str1="Hello"
s="Good Morning"
str2=str1                         #No error in Python since all variables are by default pointers
q=s

EXAMPLE ON PAGE:316

In [5]:
 
str1="Hello"
p="Hello"
str1="Bye"                                            #No error in python
p="Bye"

EXAMPLE ON PAGE:317

In [22]:
 
arr="Bamboozled"
len1=len(arr)                                       #return length of string
len2=len("Humpty Dumpty")
print "string=%s length=%d\n" % (arr,len1)
print "string=%s length=%d\n" % ("Humpty Dumpty",len2)

string=Bamboozled length=10

string=Humpty Dumpty length=13

EXAMPLE ON PAGE:317-318

In [23]:
 
def xstrlen(s):
    length=0
    for item in s:
        if s!="\0":
            length+=1
    return length
arr="Bamboozled"
len1=xstrlen(arr) 
len2=xstrlen("Humpty Dumpty")
print "string=%s length=%d\n" % (arr,len1)
print "string=%s length=%d\n" % ("Humpty dumpty",len2)

string=Bamboozled length=10

string=Humpty dumpty length=13

EXAMPLE ON PAGE:319

In [24]:
 
import copy
source="Sayonara"
target=copy.copy(source)                              #copy string
print "source string=%s\n" % (source)
print "target string=%s\n" % (target)

source string=Sayonara

target string=Sayonara

EXAMPLE ON PAGE:319-320

In [25]:
 
def xstrcpy(t,s):
    t="\0"
    for item in s:
        t=t+str(item)
    return t
source="Sayonara"
target=[]
target=xstrcpy(target,source)
print "source string=%s\n" % (source)
print "target string=%s\n" % (target)

source string=Sayonara

target string=Sayonara

EXAMPLE ON PAGE:321

In [26]:
 
pi=3.14
print "Enter radius of circle"
r=eval(raw_input())
a=pi*r*r
print "Area of circle=%f\n" % (a)

Enter radius of circle
3
Area of circle=28.260000

EXAMPLE ON PAGE:322

In [27]:
 
source="Folks!"
target="Hello"
target=target+source
print "source string=%s\n" % (source)
print "target string=%s\n" % (target)

source string=Folks!

target string=HelloFolks!

EXAMPLE ON PAGE:322-323

In [29]:
 
string1="Jerry"
string2="Ferry"
i=cmp(string1,"Jerry")
j=cmp(string1,string2)
k=cmp(string1,"Jerry boy")
print "%d %d %d\n" % (i,j,k)

0 1 -1

EXAMPLE ON PAGE:323-324

In [51]:
 
def FOUND():
    return 1
def NOTFOUND():
    return 0
masterlist=["akshay","parag","raman","srinivas","gopal","rajesh"]
print "Enter your name"
yourname=raw_input()
flag=NOTFOUND()
for i in range(0,6,1):
    a=cmp(masterlist[i],yourname)
    if a==0:
        print "Welcome,you can enter the palace\n"
        flag=FOUND()
        break
if flag==NOTFOUND():
    print "Sorry,you are a trespasser\n"

Enter your name
gopal
Welcome,you can enter the palace

EXAMPLE ON PAGE:327

In [46]:
 
names=["akshay","parag","raman","srinivas","gopal","rajesh"]
names = map(bytearray, names)
print "Original:%s %s\n" % (names[2],names[3])
s = sorted((names[2], names[3]), key=len)
for i in range(len(s[1])):
    try:
        t=s[0][i]
        s[0][i]=s[1][i]
        s[1][i]=t
    except IndexError:
        for _ in range(i, len(s[1])):
            #remove the items from the longer string to and append them to the shorter one.
            s[0].append(s[1].pop(i))            
print "New:%s %s\n" % (names[2],names[3])

Original:raman srinivas

New:srinivas raman

EXAMPLE ON PAGE-328

In [48]:
 
names=["akshay","parag","raman","srinivas","gopal","rajesh"]
print "Original:%s %s\n" % (names[2],names[3])
t=names[2]
names[2]=names[3]
names[3]=t
print "New:%s %s\n" % (names[2],names[3])

Original:raman srinivas

New:srinivas raman

EXAMPLE ON PAGE:329

In [50]:
 
names=[]
for i in range(6):
    names.append("\0") 
for i in range(0,6,1):
    print "Enter name"
    names[i]=raw_input()

Enter name
RAM
Enter name
GOPAL
Enter name
PANDEY
Enter name
GOPU
Enter name
CHOTU
Enter name
RADHEY

EXAMPLE ON PAGE:329-330

In [7]:
 
names=[]
for i in range(0,6):
    names.append('\0')
for i in range(0,6,1):
    print "Enter name"
    n=raw_input()
    length=len(n)
    import copy
    p=copy.copy(n)
    names[i]=p
for i in range(0,6,1):
    print "%s\n" % (names[i])

Enter name
MUKUT
Enter name
BIHARI
Enter name
PANDEY
Enter name
MADHUBALA
Enter name
PANDEY
Enter name
SUNITA
MUKUT

BIHARI

PANDEY

MADHUBALA

PANDEY

SUNITA