How to manipulate strings with ". find"

Question

I can use ". find" to make the program search for a word within a typed text and say whether it exists or not?(true or false) and what line of text is located, if not, what command do I use to do this? What I’ve got so far:

a = str(input())
#output: Criando um exemplo.
print(a.find('exemplo'))

Answer 1

The method find shall be used only if you are interested in the position of the occurrence in string, that is, to know in which part of string the desired value was found. If the intention is only to check if it is found, the ideal is to use the operator in:

texto = input()
if "exemplo" in texto:
    print("Encontrou")

^{See working on Ideone | Repl.it}

Remember that in Python 3, the return of the function input is already a string, then there is no need to convert it again.

If it is really interesting to know in which position the desired value occurred, it is possible to do something like:

texto = input()
index = texto.find("exemplo")
if index >= 0:
    print("Encontrou na posição %d" % index)

^{See working on Ideone | Repl.it}