python函數中將變量名轉換成字符串實例
考慮到在日常中,常常需要對模型指標輸出,但涉及多個模型的時候,需要對其有標示輸出,故需要將模型變量名轉換成字符串。
看到的基本方法有兩種:
一、方法層面:
方法1(函數內推薦):
def namestr(obj, namespace): return [name for name in namespace if namespace[name] is obj]print(namestr(lr_origin,globals()),’n’,namestr(lr_origin,globals())[0])
輸出:
‘lr_origin’
方法2:
import inspect, redef varname(p): for line in inspect.getframeinfo(inspect.currentframe().f_back)[3]: m = re.search(r’bvarnames*(s*([A-Za-z_][A-Za-z0-9_]*)s*)’, line) if m: return m.group(1)varname(lr_origin)
輸出:
’lr_origin’
二、示例
采用方法1
def small_feature_model(model,X_train=X_train,y_train=y_train,X_test=X_test, y_test=y_test): pca = PCA(n_components=150,random_state=0,whiten=True) pipeline = Pipeline([(’scale’,StandardScaler()),(’pca’,pca)]) processing = pipeline.fit(X_train) X_train = processing.transform(X_train) X_test = processing.transform(X_test) model.fit(X_train, y_train) y_pred = model.predict(X_test)# print(namestr(model,globals())) print(’**small-%s的準確率**: %.3f’ %(namestr(model,globals())[0],accuracy_score(y_pred=y_pred, y_true=y_test))) small_feature_model(svm_origin)
輸出
[’svm_origin’]**small-svm_origin的準確率**: 0.789
for model in [svm_origin, svm_rbf, lr_origin]:small_feature_model(model)
輸出
**small-svm_origin的準確率**: 0.789**small-svm_rbf的準確率**: 0.811**small-lr_origin的準確率**: 0.835
采用方法2
def small_feature_model(model,X_train=X_train,y_train=y_train,X_test=X_test, y_test=y_test): pca = PCA(n_components=150,random_state=0,whiten=True) pipeline = Pipeline([(’scale’,StandardScaler()),(’pca’,pca)]) processing = pipeline.fit(X_train) X_train = processing.transform(X_train) X_test = processing.transform(X_test) model.fit(X_train, y_train) y_pred = model.predict(X_test)# print(namestr(model,globals())) print(’**small-%s的準確率**: %.3f’ %(varname(model),accuracy_score(y_pred=y_pred, y_true=y_test))) small_feature_model(svm_origin)
輸出
**small-model的準確率**: 0.789
for model in [svm_origin, svm_rbf, lr_origin]:small_feature_model(model)
輸出
**small-model的準確率**: 0.789**small-model的準確率**: 0.811**small-model的準確率**: 0.835
補充知識:一個python實現翻轉字符串的函數
實現字符串翻轉的函數(python)
string = ’abcdef’def demo1(string): if len(string) <= 1: return string return demo1(string[1:]) +string[0]print(demo1(string))
中間用到了遞歸和切片不知道效率如何
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