[Python] Bytes type is required

I am getting the error message

data_new.write(binary_data[j])
TypeError: a bytes-like object is required, not 'int'


although binary_data should be bytes-like.

data_new = open(Datei_neu, "wb")

for j in range(0,43,1):
data_new.write(binary_data[j])


As soon as the code is extended by bytes(), then the error does not appear anymore:

data_new = open(Datei_neu, "wb")

for j in range(0,43,1):
data_new.write(bytes(binary_data[j]))



But secondly, there is nothing written into Datei_neu, although binary_data is representing all values from position 0..43.

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