Chapter 6: Applications with Strings and Text

Program 6.1, page no. 221

print "The character \\0 is used to terminate a string."

The character \0 is used to terminate a string.

Program 6.2, page no. 223

str1 = "To be or not to be"
str2 = ",that is a question"

print "Length of the string \"", str1, "\" is ", len(str1), " characters"
print "Length of the string \"", str2, "\" is ", len(str2), " characters"

Length of the string " To be or not to be " is  18  characters
Length of the string " ,that is a question " is  19  characters

Program 6.3, page no. 225

str1 = "Computers do what you tell them to do, not what you want them to do."
str2 = "When you put something in memory, remember where you put it."
str3 = "Never test for a condition you don't know what to do with."

print "There are 3 strings."
print "The string: "
print str1
print "contains ", len(str1), " characters"
print "The string: "
print str2
print "contains ", len(str3), " characters"
print "The string: "
print str3
print "contains ", len(str3), " characters"

There are 3 strings.
The string: 
Computers do what you tell them to do, not what you want them to do.
contains  68  characters
The string: 
When you put something in memory, remember where you put it.
contains  58  characters
The string: 
Never test for a condition you don't know what to do with.
contains  58  characters

Program 6.4, page no. 230

preamble = "The joke is: "
str1 = "My dog hasn\'t got any nose.\n"
str2 = "How does your dog smell then?\n"
str3 = "My dog smells horrible.\n"
joke = str1 + str2 + str3

print preamble
print joke

The joke is: 
My dog hasn't got any nose.
How does your dog smell then?
My dog smells horrible.

Program 6.5, page no. 234

print "Type in the first word (maximum 20 characters): ",
word1 = raw_input()
print "Type in the second word (maximum 20 characters): ",
word2 = raw_input()

if(word1 == word2):
    print "You have entered identical words"
else:
    print "%s precedes %s\n" %((word2 if(word1 > word2) else word1), (word1 if(word1 > word2) else word2)) 

Program 6.6, page no. 240

str1 = "This string contains the holy grail."
str2 = "the holy grail"
str3 = "the holy grill"
 
if str2 in str1:
    print "\"%s\" was found in \"%s\"\n" %(str2, str1)
else:
    print "\n\"%s\" was not found." %str2
 
if not(str3 in str1):
    print "\"%s\" was not found.\n" % str3
else:
    print "\nWe shouldn't get to here!"

"the holy grail" was found in "This string contains the holy grail."

"the holy grill" was not found.

Program 6.7, page no. 243

print "Enter some prose that is less than 1000 characters (go on typing hit enter to terminate):"
str1 = raw_input()

if len(str1) > 1000:
    print "Maximum permitted input length exceeded."

list_str1 = str1.split(" ")

print "The words in the prose that you entered are: "

for i in range(0, len(list_str1)):
    print list_str1[i], "\t",
    if i % 5 == 0:
        print "\n"

print "Words found ", len(list_str1)

Enter some prose that is less than 1000 characters (go on typing hit enter to terminate):
y father's family name being Pirrip, and my Christian name Philip, my infant tongue could make of both names nothing longer or more explicit than Pip. So, I called myself Pip, and came to be called Pip.
The words in the prose that you entered are: 
y 	

father's 	family 	name 	being 	Pirrip, 	

and 	my 	Christian 	name 	Philip, 	

my 	infant 	tongue 	could 	make 	

of 	both 	names 	nothing 	longer 	

or 	more 	explicit 	than 	Pip. 	

So, 	I 	called 	myself 	Pip, 	

and 	came 	to 	be 	called 	

Pip. 	Words found  37

Program 6.8, page no. 249

nLetters = 0
nDigits = 0
nPunct = 0
print "Enter an interesting string of less than 100 characters: "
str1 = raw_input()

for char in str1:
    if char.isalpha():
        nLetters += 1
    elif char.isdigit():
        nDigits += 1
    elif char == " ":
        pass
    else:
        nPunct += 1

print "Your string contained %d letters, %d digits and %d punctuation characters. " %(nLetters, nDigits, nPunct)

Enter an interesting string of less than 100 characters: 
I was born on the 3rd of October 1895, which is long ago.
Your string contained 38 letters, 5 digits and 2 punctuation characters. 

Program 6.9, page no. 251

print "Enter the string to be searched (less than 100 characters): ",
text = raw_input()
 
print "Enter the string sought (less than 40 characters):",
substring = raw_input()
 
print "First string entered: ", text
print "Second string entered: ", substring
 
text = text.upper()
substring = substring.upper() 
print "The second string %s found in the first. " %("was not" if not substring in text else "was")

Enter the string to be searched (less than 100 characters): Cry havoc, and let slip the dogs of war.
 Enter the string sought (less than 40 characters):The Dogs of War
 First string entered:  Cry havoc, and let slip the dogs of war.
Second string entered:  The Dogs of War
The second string was found in the first. 

Program 6.10, page no. 259

import numpy

print "Enter text (hit enter to exit): ",
text = raw_input()

text_split = text.split()
distinct_words = []

for i in text_split:
    if i not in distinct_words:
        distinct_words.append(i)

word_count = numpy.zeros(len(distinct_words))

for i in range(len(distinct_words)):
    for j in range(len(text_split)):
        if distinct_words[i] == text_split[j]:
            word_count[i] += 1

for i in range(len(distinct_words)):
    print distinct_words[i], int(word_count[i])
    if i == 5:
        print ""

Enter text (hit enter to exit): When I makes tea I makes tea, as old mother Grogan said. And when I makes water I makes water. Begob, ma'am, says Mrs Cahill, God send you don't make them in the same pot.
 When 1
I 4
makes 4
tea 1
tea, 1
as 1

old 1
mother 1
Grogan 1
said. 1
And 1
when 1
water 1
water. 1
Begob, 1
ma'am, 1
says 1
Mrs 1
Cahill, 1
God 1
send 1
you 1
don't 1
make 1
them 1
in 1
the 1
same 1
pot. 1