Iterative find/replace from a list of tuples in Python

Question

I have a list of tuples, each containing a find/replace value that I would like to apply to a string. What would be the most efficient way to do so? I will be applying this

Answer 1

x = 'find1, find2, find3'
y = [('find1', 'replace1'), ('find2', 'replace2'), ('find3', 'replace3')]

def processThis(str,lst):
    for find, replace in lst:
        str = str.replace(find, replace)

    return str

>>> processThis(x,y)
'replace1, replace2, replace3'