How to make the converters keyword of genfromtxt (numpy) work in Python 3? -


from numpy user guide take following example uses converters keyword format data

from io import bytesio convertfunc = lambda x: float(x.strip("%"))/100 data = "1, 2.3%, 45.\n6, 78.9%, 0." names = ('i', 'p', 'n') = np.genfromtxt(bytesio(data.encode()), delimiter = ',', names = names, converters = {1 : convertfunc}) print(a)

however, not work in python 3. error message

    traceback (most recent call last):   file "/users/macbookpro/documents/workspace/python3/learnnumpy/importingdata.py", line 46, in <module>     = np.genfromtxt(bytesio(data.encode()), delimiter = ',', names = names, converters = {1 : convertfunc})   file "/users/macbookpro/anaconda/lib/python3.4/site-packages/numpy/lib/npyio.py", line 1708, in genfromtxt     (i, conv) in enumerate(converters)]))   file "/users/macbookpro/anaconda/lib/python3.4/site-packages/numpy/lib/npyio.py", line 1708, in <listcomp>     (i, conv) in enumerate(converters)]))   file "/users/macbookpro/anaconda/lib/python3.4/site-packages/numpy/lib/npyio.py", line 1707, in <listcomp>     zip(*[[conv._loose_call(_r) _r in map(itemgetter(i), rows)]   file "/users/macbookpro/anaconda/lib/python3.4/site-packages/numpy/lib/_iotools.py", line 668, in _loose_call     return self.func(value)   file "/users/macbookpro/documents/workspace/python3/learnnumpy/importingdata.py", line 43, in <lambda>     convertfunc = lambda x: float(x.strip("%"))/100 typeerror: 'str' not support buffer interface

how make work , matter of fact, why fail exactly?

you need change string literal in convertfunc byte-string changing "%" b"%" or "%".encode()

the reason in python 3 strings unicode default, whereas in python 2 strings bytes default.


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