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Identity is not the same thing as equality in Python #521
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Use ==/!= to compare str, bytes, and int literals. $ __python__ ``` >>> ord = 'fr' >>> ord += 'o' >>> ord is 'fro' True >>> ord is 'fro' False ``` [flake8](http://flake8.pycqa.org) testing of https://github.com/HIPS/autograd on Python 3.7.1 $ __flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics__ ``` ./autograd/numpy/fft.py:19:8: F821 undefined name 'fft' defvjp(fft, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:20:32: F821 undefined name 'fft' fft_grad(get_fft_args, fft, *args, **kwargs)) ^ ./autograd/numpy/fft.py:21:8: F821 undefined name 'ifft' defvjp(ifft, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:22:32: F821 undefined name 'ifft' fft_grad(get_fft_args, ifft, *args, **kwargs)) ^ ./autograd/numpy/fft.py:24:8: F821 undefined name 'fft2' defvjp(fft2, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:25:32: F821 undefined name 'fft2' fft_grad(get_fft_args, fft2, *args, **kwargs)) ^ ./autograd/numpy/fft.py:26:8: F821 undefined name 'ifft2' defvjp(ifft2, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:27:32: F821 undefined name 'ifft2' fft_grad(get_fft_args, ifft2, *args, **kwargs)) ^ ./autograd/numpy/fft.py:29:8: F821 undefined name 'fftn' defvjp(fftn, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:30:32: F821 undefined name 'fftn' fft_grad(get_fft_args, fftn, *args, **kwargs)) ^ ./autograd/numpy/fft.py:31:8: F821 undefined name 'ifftn' defvjp(ifftn, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:32:32: F821 undefined name 'ifftn' fft_grad(get_fft_args, ifftn, *args, **kwargs)) ^ ./autograd/numpy/fft.py:72:8: F821 undefined name 'rfft' defvjp(rfft, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:73:33: F821 undefined name 'irfft' rfft_grad(get_fft_args, irfft, *args, **kwargs)) ^ ./autograd/numpy/fft.py:75:8: F821 undefined name 'irfft' defvjp(irfft, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:76:34: F821 undefined name 'rfft' irfft_grad(get_fft_args, rfft, *args, **kwargs)) ^ ./autograd/numpy/fft.py:78:8: F821 undefined name 'rfft2' defvjp(rfft2, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:79:34: F821 undefined name 'irfft2' rfft_grad(get_fft2_args, irfft2, *args, **kwargs)) ^ ./autograd/numpy/fft.py:81:8: F821 undefined name 'irfft2' defvjp(irfft2, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:82:35: F821 undefined name 'rfft2' irfft_grad(get_fft2_args, rfft2, *args, **kwargs)) ^ ./autograd/numpy/fft.py:84:8: F821 undefined name 'rfftn' defvjp(rfftn, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:85:34: F821 undefined name 'irfftn' rfft_grad(get_fftn_args, irfftn, *args, **kwargs)) ^ ./autograd/numpy/fft.py:87:8: F821 undefined name 'irfftn' defvjp(irfftn, lambda *args, **kwargs: ^ ./autograd/numpy/fft.py:88:35: F821 undefined name 'rfftn' irfft_grad(get_fftn_args, rfftn, *args, **kwargs)) ^ ./autograd/numpy/fft.py:90:8: F821 undefined name 'fftshift' defvjp(fftshift, lambda ans, x, axes=None : lambda g: ^ ./autograd/numpy/fft.py:91:44: F821 undefined name 'ifftshift' match_complex(x, anp.conj(ifftshift(anp.conj(g), axes)))) ^ ./autograd/numpy/fft.py:92:8: F821 undefined name 'ifftshift' defvjp(ifftshift, lambda ans, x, axes=None : lambda g: ^ ./autograd/numpy/fft.py:93:44: F821 undefined name 'fftshift' match_complex(x, anp.conj(fftshift(anp.conj(g), axes)))) ^ ./autograd/numpy/numpy_jvps.py:145:39: F821 undefined name 'np' num_reps = anp.prod(anp.array(np.shape(g))[list(axis)]) ^ ./autograd/numpy/linalg.py:24:8: F821 undefined name 'det' defvjp(det, lambda ans, x: lambda g: add2d(g) * add2d(ans) * T(inv(x))) ^ ./autograd/numpy/linalg.py:24:64: F821 undefined name 'inv' defvjp(det, lambda ans, x: lambda g: add2d(g) * add2d(ans) * T(inv(x))) ^ ./autograd/numpy/linalg.py:25:8: F821 undefined name 'slogdet' defvjp(slogdet, lambda ans, x: lambda g: add2d(g[1]) * T(inv(x))) ^ ./autograd/numpy/linalg.py:25:58: F821 undefined name 'inv' defvjp(slogdet, lambda ans, x: lambda g: add2d(g[1]) * T(inv(x))) ^ ./autograd/numpy/linalg.py:29:8: F821 undefined name 'inv' defvjp(inv, grad_inv) ^ ./autograd/numpy/linalg.py:38:8: F821 undefined name 'pinv' defvjp(pinv, grad_pinv) ^ ./autograd/numpy/linalg.py:43:38: F821 undefined name 'solve' return lambda g: -_dot(updim(solve(T(a), g)), T(updim(ans))) ^ ./autograd/numpy/linalg.py:45:26: F821 undefined name 'solve' return lambda g: solve(T(a), g) ^ ./autograd/numpy/linalg.py:46:8: F821 undefined name 'solve' defvjp(solve, partial(grad_solve, 0), partial(grad_solve, 1)) ^ ./autograd/numpy/linalg.py:88:39: F632 use ==/!= to compare str, bytes, and int literals if ord is None or ord == 2 or ord is 'fro': ^ ./autograd/numpy/linalg.py:92:24: F821 undefined name 'svd' u, s, vt = svd(x_rolled, full_matrices=False) ^ ./autograd/numpy/linalg.py:102:8: F821 undefined name 'norm' defvjp(norm, grad_norm) ^ ./autograd/numpy/linalg.py:115:8: F821 undefined name 'eigh' defvjp(eigh, grad_eigh) ^ ./autograd/numpy/linalg.py:122:32: F821 undefined name 'solve' solve_trans = lambda a, b: solve(T(a), b) ^ ./autograd/numpy/linalg.py:132:8: F821 undefined name 'cholesky' defvjp(cholesky, grad_cholesky) ^ ./autograd/numpy/linalg.py:142:19: F821 undefined name 'svd' usv = svd(a, full_matrices=False) ^ ./autograd/numpy/linalg.py:223:8: F821 undefined name 'svd' defvjp(svd, grad_svd) ^ ./autograd/numpy/numpy_wrapper.py:37:45: F821 undefined name 'ndarray' return _np.concatenate(args, axis).view(ndarray) ^ ./autograd/numpy/numpy_wrapper.py:39:47: F821 undefined name 'atleast_2d' vstack = row_stack = lambda tup: concatenate([atleast_2d(_m) for _m in tup], axis=0) ^ ./autograd/numpy/numpy_wrapper.py:41:13: F821 undefined name 'atleast_1d' arrs = [atleast_1d(_m) for _m in tup] ^ ./autograd/numpy/numpy_wrapper.py:109:12: F821 undefined name 'ndim' if ndim(arr) != 1: ^ ./autograd/numpy/numpy_wrapper.py:110:19: F821 undefined name 'ravel' arr = ravel(arr) ^ ./autograd/numpy/numpy_wrapper.py:111:18: F821 undefined name 'ravel' values = ravel(array(values)) ^ ./autograd/numpy/numpy_wrapper.py:112:16: F821 undefined name 'ndim' axis = ndim(arr) - 1 ^ ./autograd/scipy/linalg.py:14:25: F821 undefined name 'solve_sylvester' return anp.real(solve_sylvester(ans_transp, ans_transp, g)) ^ ./autograd/scipy/linalg.py:16:8: F821 undefined name 'sqrtm' defvjp(sqrtm, _vjp_sqrtm) ^ ./autograd/scipy/linalg.py:29:18: F821 undefined name 'solve_triangular' v = al2d(solve_triangular(a, g, trans=_flip(a, trans), lower=lower)) ^ ./autograd/scipy/linalg.py:33:8: F821 undefined name 'solve_triangular' defvjp(solve_triangular, ^ ./autograd/scipy/linalg.py:36:18: F821 undefined name 'solve_triangular' lambda g: solve_triangular(a, g, trans=_flip(a, trans), lower=lower)) ^ ./autograd/scipy/linalg.py:40:12: F821 undefined name 'solve_sylvester' return solve_sylvester(ans, ans, dA) ^ ./autograd/scipy/linalg.py:41:8: F821 undefined name 'sqrtm' defjvp(sqrtm, _jvp_sqrtm) ^ ./autograd/scipy/linalg.py:53:12: F821 undefined name 'solve_sylvester' return solve_sylvester(a, b, rhs) ^ ./autograd/scipy/linalg.py:54:16: F821 undefined name 'solve_sylvester' defjvp_argnums(solve_sylvester, _jvp_sylvester) ^ ./autograd/scipy/linalg.py:60:17: F821 undefined name 'solve_sylvester' q_vjp = solve_sylvester(anp.transpose(a), anp.transpose(b), g) ^ ./autograd/scipy/linalg.py:66:16: F821 undefined name 'solve_sylvester' defvjp_argnums(solve_sylvester, _vjp_sylvester) ^ 1 F632 use ==/!= to compare str, bytes, and int literals 63 F821 undefined name 'fft' 64 ``` __E901,E999,F821,F822,F823__ are the "_showstopper_" [flake8](http://flake8.pycqa.org) issues that can halt the runtime with a SyntaxError, NameError, etc. These 5 are different from most other flake8 issues which are merely "style violations" -- useful for readability but they do not effect runtime safety. * F821: undefined name `name` * F822: undefined name `name` in `__all__` * F823: local variable name referenced before assignment * E901: SyntaxError or IndentationError * E999: SyntaxError -- failed to compile a file into an Abstract Syntax Tree
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Use ==/!= to compare str, bytes, and int literals.
$ python
flake8 testing of https://github.com/HIPS/autograd on Python 3.7.1
$ flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
E901,E999,F821,F822,F823 are the "showstopper" flake8 issues that can halt the runtime with a SyntaxError, NameError, etc. These 5 are different from most other flake8 issues which are merely "style violations" -- useful for readability but they do not effect runtime safety.
name
name
in__all__