String processing
You can change (substitute) characters in a string by using the method replace. For example, suppose we wish to replace all occurrences of '$' in the string price with '£':
price = 'eggs $2, cheese $4'
price = price.replace('$', '£') # Replace $ by £ in the string price
If we print price, we now get 'eggs £2, cheese £4'.
Other string methods are upper() (convert text to upper case), lstrip() (remove leading characters), and rstrip() (remove trailing characters). Let x ='###this Is A test???'. Consider the following sequence:
x = x.lstrip('#') # Remove left-hand leading '#' characters to get x = 'this Is A test???'
x = x.rstrip('?') # Remove right-hand trailing '?' characters to get x = 'this...
