[Python] Replace does not replace string of multiple characters, but with one character it...

I have the following data set, in which I want to replace yes and no with 1 and 0, respectively. But it does not work. It somehow only works, if I replace only one letter, but then it results in 1es or 0o, which is not favorable.

Here is the dataset

35,5 no yes no no no no no

35,9 no no yes yes yes yes no

35,9 no yes no no no no no

36,0 no no yes yes yes yes no


Here is the code

fString = open("diagnosis.data", "r")
fFloat = open("diagnosis.csv", "w")

for line in fString:
line = line.replace(",", ".")
line = line.replace("\t", ",")
line = line.replace("yes", "1")
line = line.replace("no", "0")
line = line.replace("\r\n", "\n")
fFloat.write(line)
fString.close()
fFloat.close()


and the resulting dataset

35.5,no,yes,no,no,no,no,no਍ഀ

35.9,no,no,yes,yes,yes,yes,no਍ഀ

35.9,no,yes,no,no,no,no,no਍ഀ

36.0,no,no,yes,yes,yes,yes,no਍ഀ

Somehow there appear these boxes at the end of a line?

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