Implement the function to modify and return the string ‘ str’ in such a way that all occurrences of ‘ch1’ in original string are replaced by ‘ch2’ and all occurrences of ‘ch2’ in original string are ...

Create a String A string is a sequence of characters or textual data. In Python, we create strings by enclosing characters inside quotations like: # single quotetext='Hello there'print ( text ) # ...