String Manipulation : Python Examples

# let us create a test string testString1 = "Hello World!" print "Original String: "+ testString1 # Print this string in lower case # Converting a string to lower case print "Converting to LowerCase" print testString1.lower() # Converting a string to upper case print "Converting to Upper Case" print testString1.upper() # Capitalizing a string # Only the first letter in the string will be capitalized print "Capitalizing the String" print testString1.capitalize() # Trying to slice out a substring between given indexes print "Substring from index 1 to 7" print testString1[1:8] #Substring from the start till character at index = 7 (start of string is index 0) print "Substring from the start till character at index = 7 (start of string is index 0): " print testString1[:8] #Substring from the character at index = 7, till the end of the string (remember: start of string is index 0) print "Substring from the character at index = 7, till the end of the string (remember: start of string is index 0): " print testString1[7:] #Find the position of a substring within the string #This gives us the first index during a left to right scan. If the string is not found, it returns -1 print "Find the index from which the substring 'llo' begins within the test string" print testString1.find('llo') print "Now, let's look for a substring which is not a part of the given string" print testString1.find('xxy') # Now, trying to find the index of a substring between specified indexes only print "Now, trying to find a substring between specified indexes only: looking for 'l' between 4 and 9" print testString1.find('l',4,9) # rfind is used, to find the index from the reverse # So, testString1.rfind('l') will look for the last index of l in the string print "find('l') on the given string returns the following index (scanning the string from left to right):" print testString1.find('l') print "rfind('l') on the given string returns the following index (this scans the string from right to left):" print testString1.rfind('l') # Now let us try to replace/substitute a substring of this string with another string print "Replacing World with Planet" print testString1.replace("World","Planet") # Now let us try to split the string, into separate words # let us split it wherever there is a space print "Splitting the string into words, wherever there is a space" print testString1.split(" ") print testString1.rsplit(" ") # Remove leading and trailing whitespace characters testString2 = "Hello World! " print "Current Test String=" + testString2 print "Length (there are whitespaces at the end):" + `len(testString2)` print "Length after stripping "+ `len(testString2.strip())`