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bytearray's methods aren't consistent in what they accept. 
 
append() takes either an int or a character: 
 
 
 
>>> b = bytearray('abc') 
 
>>> b.append(76) ; b 
 
bytearray(b'abcL') 
 
>>> b.append('M') ; b 
 
bytearray(b'abcLM') 
 
 
 
.insert() accepts only integers: 
 
 
 
>>> b.insert(0, 97) ; b 
 
bytearray(b'aabcLM') 
 
>>> b.insert(0, 'a') ; b 
 
Traceback (most recent call last): 
 
 File "<stdin>", line 1, in <module> 
 
TypeError: an integer is required 
 
 
 
Both PEP 358 and the docstring for .append() only document 'int' as a 
 
legal input, so I suspect append() is wrong here.