ó ŕĆSc@sddgZddlmZmZmZmZmZmZedddddd g7Zdd lm Z ed g7Zdd l m Z m Z m Z ed ddg7ZddlmZedg7ZddlmZmZmZedddg7Zd„Zd„Zd„Zd„ZdS(tItQi˙˙˙˙(tContrastMatrixt TreatmenttPolytSumtHelmerttDiffRRRRRR(tCR(tcentert standardizetscaleR R R (tbsR (tcrtcctteR RRcCs|S(sThe identity function. Simply returns its input unchanged. Since Patsy's formula parser ignores anything inside a function call syntax, this is useful to 'hide' arithmetic operations from it. For instance:: y ~ x1 + x2 has ``x1`` and ``x2`` as two separate predictors. But in:: y ~ I(x1 + x2) we instead have a single predictor, defined to be the sum of ``x1`` and ``x2``.((tx((s-lib/python2.7/site-packages/patsy/builtins.pyRscCs4tdƒdkst‚tdƒdks0t‚dS(Ni(RtAssertionErrortNone(((s-lib/python2.7/site-packages/patsy/builtins.pyttest_I-scCsYddlm}|jdƒ}y|j|SWn$tk rTtd|fƒ‚nXdS(s<A way to 'quote' variable names, especially ones that do not otherwise meet Python's variable name rules. If ``x`` is a variable, ``Q("x")`` returns the value of ``x``. (Note that ``Q`` takes the *string* ``"x"``, not the value of ``x`` itself.) This works even if instead of ``x``, we have a variable name that would not otherwise be legal in Python. For example, if you have a column of data named ``weight.in.kg``, then you can't write:: y ~ weight.in.kg because Python will try to find a variable named ``weight``, that has an attribute named ``in``, that has an attribute named ``kg``. (And worse yet, ``in`` is a reserved word, which makes this example doubly broken.) Instead, write:: y ~ Q("weight.in.kg") and all will be well. Note, though, that this requires embedding a Python string inside your formula, which may require some care with your quote marks. Some standard options include:: my_fit_function("y ~ Q('weight.in.kg')", ...) my_fit_function('y ~ Q("weight.in.kg")', ...) my_fit_function("y ~ Q(\"weight.in.kg\")", ...) Note also that ``Q`` is an ordinary Python function, which means that you can use it in more complex expressions. For example, this is a legal formula:: y ~ np.sqrt(Q("weight.in.kg")) i˙˙˙˙(tEvalEnvironmentisno data named %r foundN(t patsy.evalRtcapturet namespacetKeyErrort NameError(tnameRtenv((s-lib/python2.7/site-packages/patsy/builtins.pyR1s # cCsZd}tdƒdkst‚tdƒtks6t‚ddlm}|ttdƒdS(NitaRi˙˙˙˙(t assert_raisest asdfsadfdsad(RRt nose.toolsRR(RR((s-lib/python2.7/site-packages/patsy/builtins.pyttest_Q[s N(t__all__tpatsy.contrastsRRRRRRtpatsy.categoricalRt patsy.stateR R R t patsy.splinesR tpatsy.mgcv_cubic_splinesR RRRRRR (((s-lib/python2.7/site-packages/patsy/builtins.pyt s .     *