The compare_strings function is supposed to compare just the alphanumeric content of two strings, ignoring upper vs lower case and punctuation. But something is not working. Fill in the code to try to find the problems, then fix the problems.

import re
def compare_strings(string1, string2):
#Convert both strings to lowercase
#and remove leading and trailing blanks
string1 = string1.lower().strip()
string2 = string2.lower().strip()

#Ignore punctuation
punctuation = r"[.?!,;:-']"
string1 = re.sub(punctuation, r"", string1)
string2 = re.sub(punctuation, r"", string2)

#DEBUG CODE GOES HERE
print(___)

return string1 == string2

print(compare_strings("Have a Great Day!", "Have a great day?")) # True
print(compare_strings("It's raining again.", "its raining, again")) # True
print(compare_strings("Learn to count: 1, 2, 3.", "Learn to count: one, two, three.")) # False
print(compare_strings("They found some body.", "They found somebody.")) # False

The hyphen - should be placed at the start or end of punctuation characters. Here the role of hyphen is to determine the range of characters. Another way is to escape the hyphen - using using backslash \ symbol.

So the above statement becomes:

punctuation = r"[-.?!,;:']"

You can also do this:

punctuation = r"[.?!,;:'-]"

You can also change this statement as:

punctuation = r"[.?!,;:\-']"

Explanation:

The complete program is as follows. I have added a print statement print('string1:',string1,'\nstring2:',string2) that prints the string1 and string2 followed by return string1 == string2 which either returns true or false. However you can omit this print('string1:',string1,'\nstring2:',string2) statement and the output will just display either true or false

import re #to use regular expressions

def compare_strings(string1, string2): #function compare_strings that takes two strings as argument and compares them

string1 = string1.lower().strip() # converts the string1 characters to lowercase using lower() method and removes trailing blanks

string2 = string2.lower().strip() # converts the string1 characters to lowercase using lower() method and removes trailing blanks

punctuation = r"[-.?!,;:']" #regular expression for punctuation characters

string1 = re.sub(punctuation, r"", string1) # specifies RE pattern i.e. punctuation in the 1st argument, new string r in 2nd argument, and a string to be handle i.e. string1 in the 3rd argument

string2 = re.sub(punctuation, r"", string2) # same as above statement but works on string2 as 3rd argument

print('string1:',string1,'\nstring2:',string2) #prints both the strings separated with a new line

return string1 == string2 # compares strings and returns true if they matched else false

#function calls to test the working of the above function compare_strings

print(compare_strings("Have a Great Day!","Have a great day?")) # True

print(compare_strings("It's raining again.","its raining, again")) # True

print(compare_strings("Learn to count: 1, 2, 3.","Learn to count: one, two, three.")) # False

print(compare_strings("They found some body.","They found somebody.")) # False

The screenshot of the program along with its output is attached.

codiepienagoya codiepienagoya · Answer 2 · 2021-12-22T18:32:34+01:00

Following are the modified program to the given question:

Program Explanation:

Import package.
Defining a method "compare_strings" that takes two parameters "string1, string2".
Inside the method, parameter variables have been used that convert and hold string values into lower case.
In the next step, a variable "punctuation" is defined that holds value.
After this, a parameter variable is used that calls the sub-method that checks parameter value with punctuation variable value, and at the return keyword is used that check string1 value equal to string2.
Outside the method, multiple print method is used calls the method, and prints its value.

Program:

import re #import package

def compare_strings(string1, string2):#defining a method compare_strings that takes two parameters

string1 = string1.lower().strip()#defining a variable string1 that converts and holds string value into lower case

string2 = string2.lower().strip()#defining a variable string1 that converts and holds string value into lower case

punctuation = r'[^\w\s]'#defining a variable that holds value

string1 = re.sub(punctuation, '', string1)#using the variable that calls the sub method that checks parameter value with punctuation variable value

string2 = re.sub(punctuation, '', string2)#using the variable that calls the sub method that checks parameter value with punctuation variable value

return string1 == string2#using return keyword that check string1 value equal to string2

print(compare_strings("Have a Great Day!", "Have a great day?")) # calling method that prints the return value

print(compare_strings("It's raining again.", "its raining, again")) # calling method that prints the return value

print(compare_strings("Learn to count: 1, 2, 3.", "Learn to count: one, two, three.")) # calling method that prints the return value

print(compare_strings("They found some body.", "They found somebody.")) # calling method that prints the return value

Output:

Please find the attached file.

Learn more:

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