Als «python» getaggte Fragen

Ich muss passen RandomForestRegressorvon sklearn.ensemble. forest = ensemble.RandomForestRegressor(**RF_tuned_parameters) model = forest.fit(train_fold, train_y) yhat = model.predict(test_fold) Dieser Code hat immer funktioniert, bis ich Daten vorverarbeitet habe ( train_y). Die Fehlermeldung lautet: DataConversionWarning: Ein Spaltenvektor y wurde übergeben, als ein 1d-Array erwartet wurde. Bitte ändern Sie die Form von y in (n_samples,), …

117 python  pandas  numpy  scikit-learn 

Ich habe folgende Anforderungen: ./xyifier --prox --lport lport --rport rport Für das Argument prox verwende ich action = 'store_true', um zu überprüfen, ob es vorhanden ist oder nicht. Ich benötige keines der Argumente. Aber wenn --prox gesetzt ist, benötige ich auch rport und lport. Gibt es eine einfache Möglichkeit, dies …

117 python  argparse 

Ich kann nicht herausfinden, wie das sklearn.pipeline.Pipelinegenau funktioniert. Das Dokument enthält einige Erklärungen . Was meinen sie zum Beispiel mit: Pipeline von Transformationen mit einem endgültigen Schätzer. Was sind meine Fragen, um meine Frage klarer zu machen steps? Wie arbeiten Sie? Bearbeiten Dank der Antworten kann ich meine Frage klarer …

117 python  machine-learning  scikit-learn  neuraxle 

Ich möchte meine Flask-App so strukturieren: ./site.py ./apps/members/__init__.py ./apps/members/models.py apps.members ist ein Flask Blueprint. Um die Modellklassen zu erstellen, muss ich die App in der Hand haben, etwa: # apps.members.models from flask import current_app from flaskext.sqlalchemy import SQLAlchemy db = SQLAlchemy(current_app) class Member(db.Model): # fields here pass Aber wenn ich …

117 python  flask  flask-sqlalchemy 

Hier ist mein Code: import pandas as pd data = pd.DataFrame({'Odd':[1,3,5,6,7,9], 'Even':[0,2,4,6,8,10]}) for i in reversed(data): print(data['Odd'], data['Even']) Wenn ich diesen Code ausführe, wird folgende Fehlermeldung angezeigt: Traceback (most recent call last): File "C:\Python33\lib\site-packages\pandas\core\generic.py", line 665, in _get_item_cache return cache[item] KeyError: 5 During handling of the above exception, another exception …

117 python  pandas  reverse 

Das Verzeichnis site-packageswird in verschiedenen Python-Artikeln erwähnt. Was ist es? Wie benutzt man es?

117 python 

Mit Python Pandas versuche ich das Country& Placemit dem Maximalwert zu finden . Dies gibt den Maximalwert zurück: data.groupby(['Country','Place'])['Value'].max() Aber wie bekomme ich den entsprechenden Countryund PlaceNamen?

117 python  pandas  dataframe  max 

Ich habe eine Zeichenfolge im Base64-Format, die ein PNG-Bild darstellt. Gibt es eine Möglichkeit, dieses Bild als PNG-Datei im Dateisystem zu speichern? Ich habe das Bild mit Flex codiert. Eigentlich ist es das, was ich auf dem Server bekomme (kann nach keiner der vorgeschlagenen Methoden ein Bild sehen :() 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117 python  image 

Was ist der Unterschied zwischen subprocess.Popen()und os.system()?

117 python  subprocess  system 

Manchmal scheint es natürlich, einen Standardparameter zu haben, der eine leere Liste ist. Doch Python gibt ein unerwartetes Verhalten in diesen Situationen . Wenn ich zum Beispiel eine Funktion habe: def my_func(working_list = []): working_list.append("a") print(working_list) Das erste Mal, wenn es als Standard aufgerufen wird, funktioniert, aber Anrufe danach aktualisieren …

117 python  python-3.x 

Im folgenden Code erstelle ich eine abstrakte Basisklasse Base. Ich möchte, dass alle Klassen, die von erben Base, die nameEigenschaft bereitstellen , also habe ich diese Eigenschaft zu einer gemacht @abstractmethod. Dann habe ich eine Unterklasse von Basenamens erstellt Base_1, die einige Funktionen bereitstellen soll, aber dennoch abstrakt bleibt. Es …

117 python  properties  abstract-class  decorator 

Was ist die pythonischste Art, zwei Saiten miteinander zu verbinden? Beispielsweise: Eingang: u = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' l = 'abcdefghijklmnopqrstuvwxyz' Ausgabe: 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz'

116 python  string  python-2.7  python-3.x 

Diese Frage passt derzeit nicht zu unserem Q & A-Format. Wir erwarten, dass die Antworten durch Fakten, Referenzen oder Fachwissen gestützt werden, aber diese Frage wird wahrscheinlich zu Debatten, Argumenten, Umfragen oder erweiterten Diskussionen führen. Wenn Sie der Meinung sind, dass diese Frage verbessert und möglicherweise erneut geöffnet werden kann, …

116 python  coding-style 

Ich versuche, den Umfang in verschachtelten Klassen in Python zu verstehen. Hier ist mein Beispielcode: class OuterClass: outer_var = 1 class InnerClass: inner_var = outer_var Die Erstellung der Klasse ist nicht abgeschlossen und ich erhalte den Fehler: <type 'exceptions.NameError'>: name 'outer_var' is not defined Der Versuch inner_var = Outerclass.outer_varfunktioniert nicht. …

116 python  class  scope  nested  inner-classes 

Ich habe versucht, unerwünschte Zeichen mit text.translate()Python 3.4 aus einer bestimmten Zeichenfolge zu entfernen . Der minimale Code lautet: import sys s = 'abcde12345@#@$#%$' mapper = dict.fromkeys(i for i in range(sys.maxunicode) if chr(i) in '@#$') print(s.translate(mapper)) Es funktioniert wie erwartet. Das gleiche Programm, wenn es in Python 3.4 und Python …

116 python  string  python-3.x  python-internals  python-3.5