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str.replace(old, new[, max])

#!/usr/bin/python3

str = "www.w3cschool.cc"
print ("tutorialpro.org old address:", str)
print ("tutorialpro.org new address:", str.replace("w3cschool.cc", "tutorialpro.org"))

str = "this is string example....wow!!!"
print (str.replace("is", "was", 3))

tutorialpro.org old address: www.w3cschool.cc
tutorialpro.org new address: www.tutorialpro.org
thwas was string example....wow!!!