Replace String with increasing numer [SOLVED]

[Axel_Erfurt]

maybe like this?

mytext = """hello example
example test
world example
example to learn
best example
example new
better example"""

result = ""

filedata = mytext.splitlines()

i = 1
for line in filedata: 
    if 'example' in line:
        line = line.replace("example", f"example_{str(i)}")
        i += 1
    result += f"{line}\n"

print(result)

Output:
hello example_1
example_2 test
world example_3
example_4 to learn
best example_5
example_6 new
better example_7