bytearray.find(sub[, start[, end]])
Return the lowest index in the data where the subsequence sub is found, such that sub is contained in the slice s[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if sub is not found.
The subsequence to search for may be any bytes-like object or an integer in the range 0 to 255.
Note
The find() method should be used only if you need to know the position of sub. To check if sub is a substring or not, use the in operator:
>>> b'Py' in b'Python' True
Changed in version 3.3: Also accept an integer in the range 0 to 255 as the subsequence.
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