Software DD (Implementation: String Handling)

Question 1

What would be the output of this code?
mystring = “The quick brown fox jumps over the lazy dog”
print(mystring[2])

Answer 1

e

Question 2

What would be the output of this code?

mystring = “The quick brown fox jumps over the lazy dog”
print(mystring[0:3])

Answer 2

The

Question 3

What would be the output of this code?

original =”I am a string”
print(original[2:4])

Answer 3

am

Question 4

What would be the output of this code?

original =”I am a string”
print(original[7:len(original)])

Answer 4

string

Question 5

What would be the output of this code?

original =”I am a string”
print(original[0:4])

Answer 5

I am

Question 6

What would be the output of this code?

original =”I am a string”
print(original[-4])

Answer 6

r

Question 7

What would be the output of this code?

original =”I am a string”
print(original[-6:])

Answer 7

string

Question 8

What would be the output of this code?

original = “This string is my original”
print(original[0:3:2])

Answer 8

Gives us the following output - as Python will print the characters from position 0 to before position 3 but increasing the position by 2 each time. So will print out the characters at position 0 and 2.

Ti

Question 9

What would be the output of this code?

original = “This string is my original”
print(original[::-1])

Answer 9

lanigiro ym si gnirts sihT

Generic method:
original = “This string is my original”
newstring = “”
for x in range(len(original)-1,-1,-1):
newstring += original[x]
print (newstring)

Question 10

Convert string into an ASCII Value

Answer 10

use ord()

Example:
character = ord(“a”)
print(character)

Output: 97

Question 11

Convert ASCII Value to a string

Answer 11

use chr()

Example:
character = chr(65)
print(character)

Output: A

Question 12

Example problem from RGC Aberdeen website:

So we can use this to generate a random value between 65 and 90 and then grab the corresponding ASCII value to generate a random uppercase character such as below. This could be a useful technique for generating passwords etc.

Answer 12

import random
character = chr(random.randint(65,90))

Question 13

What does the modulus function do?

Answer 13

The modulus function or operator gives the remainder of a division. In some languages it is accessed by a predefined function but in Python is performed using the % operator

Question 14

What would be the output of this code?

remainder = 10 % 3
print(“Remainder = “ + str(remainder))

Answer 14

Remainder = 1

Question 15

What does int() do?

Answer 15

My Summary: Converts a real number to an integer. Unlike round() it doesn’t round the real number, int() simply cuts the mantissa off so int(6.833333333) would equal 6