< Example 1 > String Declaration/Assignment and print

aString = "Hello World"

print(aString)

Result :----------------------------------

Hello World

< Example 2 > String Concatenation

aString = "Hello World"

bString = " Python"

cString = aString + bString

print(cString)

Result :----------------------------------

Hello World Python

< Example 3 > Finding Length of a String

aString = "Hello World"

print(len(aString))

Result :----------------------------------

13

< Example 4 > Cut out one character from a String

aString = "Hello World"

print(aString[0])

Result :----------------------------------

H

< Example 5 > Cut out a segment from a String

aString = "Hello World"

print(aString[1:5])

Result :----------------------------------

ello

< Example 6 > Convert all the letters to Upper Case

aString = "Hello World"

print(aString.upper())

Result :----------------------------------

HELLO WORLD

< Example 7 > Convert all the letters to Lower Case

aString = "Hello World"

print(aString.lower())

Result :----------------------------------

hello world

< Example 8 > Compare two strings

aString = "Hello"

bString = "hello"

if aString == bString :

   print("Two Strings are same.")

else :

   print("Two Strings are different.")

if aString.upper() == bString.upper() :

   print("Two Strings are same.")

else :

   print("Two Strings are different.")

Result :----------------------------------

Two Strings are different.

Two Strings are same.

< Example 9 > Split a String with a delimiter

aString = "This is an example of string operations in Python"

splitString = aString.split(" ")

print(splitString)

print("The 4th Word = ",splitString[3])

Result :----------------------------------

['This', 'is', 'an', 'example', 'of', 'string', 'operations', 'in', 'Python']

The 4th Word =  example

< Example 10 > Find a substring in a string

aString = "This is a Python string"

print(aString.find("This"))

print(aString.find("string"))

print(aString.find("java"))

Result :----------------------------------

0

17

-1

< Example 11 > Converting a number to a string

num1 = 1234

num2 = 5678

str1 = str(num1)

str2 = str(num2)

stradd = str1+str2

numadd = num1+num2

print(numadd)

print(stradd)

Result :----------------------------------

6912

12345678

< Example 12 > Writing double quotes in a string

# there are several different ways to writing double quotes in a string

aString = 'He said "Hello World"'

bString = "He said \"Hello World\""

print("aString =",aString)

print("bString =",bString)

Result :----------------------------------

aString = He said "Hello World"

bString = He said "Hello World"

< Example 13 > Converting Binary String to String, Converting a String to Binary String

aString = 'Hello World'

bString = b'Hello World'

print("aString =",aString)

print("bString =",bString)

print("aString.encode('ascii') =",aString.encode('ascii'))

print("bString.decode('ascii') =",bString.decode('ascii'))

Result :----------------------------------

aString = Hello World

bString = b'Hello World'

aString.encode('ascii') = b'Hello World'

bString.decode('ascii') = Hello World

< Example 14 > Replace a substring in a String

orgStr = 'Hello World'

replacedString = orgStr.replace('Hello', 'Hi')

print("orgStr = ", orgStr)

print("replacedString = ", replacedString)

Result :----------------------------------

orgStr =  Hello World

replacedString =  Hi World

< Example 15 > Removing all the spaces in a String

orgStr = 'H e l l o W o r l d'

replacedString = orgStr.replace(" ", "")

print("orgStr = ", orgStr)

print("replacedString = ", replacedString)

Result :----------------------------------

orgStr =  H e l l o W o r l d

replacedString =  HelloWorld

< Example 16 > Removing Carriage Return in a String

orgStr = '\nHello\nWorld'

replacedString = orgStr.replace("\n", " ")

print("orgStr = ", orgStr)

print("replacedString =", replacedString)

Result :----------------------------------

orgStr =  

Hello

World

replacedString =  Hello World

< Example 17 > Convert a Hex String into a stream of Hex Numbers (binascii package)

import binascii

hexStr = "AABBCC"

hexNumbers = binascii.a2b_hex(hexStr)

print("hexStr = ",hexStr)

print("hexNumbers = ", hexNumbers)

Result :----------------------------------

hexStr =  AABBCC

hexNumbers =  b'\xaa\xbb\xcc'

< Example 18 > Convert a stream of Hex Numbers into a Byte Array (binascii package)

import binascii

hexStr = "AABBCC"

hexNumbers = binascii.a2b_hex(hexStr)

byteArray = bytearray(hexNumbers)

print("hexStr = ",hexStr)

print("hexNumbers = ", hexNumbers)

print("byteArray = ", byteArray)

print("hexStr[0]=",hexStr[0])

print("hexNumbers[0]=",hexNumbers[0])

print("byteArray[0]=",byteArray[0])

Result :----------------------------------

hexStr =  AABBCC

hexNumbers =  b'\xaa\xbb\xcc'

byteArray =  bytearray(b'\xaa\xbb\xcc')

hexStr[0]= A

hexNumbers[0]= 170

byteArray[0]= 170

< Example 19 > Trimming a string

strA = "   Hello World          "

strB = "### Hello World #####"

trimmedA = strA.strip(" ")

trimmedB = strA.strip("#")

print("strA =",strA)

print("trimmedA =",trimmedA)

print("strB =",strB)

print("trimmedB =",trimmedB)

Result :----------------------------------

strA =    Hello World          

trimmedA = Hello World

strB = ### Hello World #####

trimmedB =    Hello World   

< Example 20 >