Pytania otagowane jako python

Ostatnio zauważyłem, że kiedy jestem konwertowania listdo setrzędu elementów ulega zmianie i jest klasyfikowane według charakteru. Rozważmy ten przykład: x=[1,2,20,6,210] print x # [1, 2, 20, 6, 210] # the order is same as initial order set(x) # set([1, 2, 20, 210, 6]) # in the set(x) output order is …

119 python  set 

Muszę zmieścić RandomForestRegressorod sklearn.ensemble. forest = ensemble.RandomForestRegressor(**RF_tuned_parameters) model = forest.fit(train_fold, train_y) yhat = model.predict(test_fold) Ten kod zawsze działał, dopóki nie wykonałem wstępnego przetwarzania danych ( train_y). Komunikat o błędzie mówi: DataConversionWarning: przekazano wektor-kolumnę y, gdy oczekiwano tablicy 1d. Zmień kształt y na (n_samples,), na przykład za pomocą ravel (). model …

119 python  pandas  numpy  scikit-learn 

Czy jest jakaś funkcja, która byłaby odpowiednikiem kombinacji df.isin()i df[col].str.contains()? Na przykład, powiedzmy, że mam serię s = pd.Series(['cat','hat','dog','fog','pet'])i chcę znaleźć wszystkie miejsca, w których szawiera którekolwiek z ['og', 'at'], chciałbym uzyskać wszystko oprócz „zwierzaka”. Mam rozwiązanie, ale jest raczej nieeleganckie: searchfor = ['og', 'at'] found = [s.str.contains(x) for x …

119 python  string  pandas  dataframe  match 

Katalog site-packagesjest wymieniany w różnych artykułach związanych z Pythonem. Co to jest? Jak tego użyć?

119 python 

Właśnie dowiedziałem się, że w Pythonie istnieją wartości Truthy i Falsy, które różnią się od normalnych Truei False? Czy ktoś może szczegółowo wyjaśnić, jakie są prawdziwe i fałszywe wartości? Gdzie mam ich używać? Jaka jest różnica między prawdą a Truewartościami i fałszem a Falsewartościami?

119 python 

Koniec dowcipu. Po kilkunastu godzinach rozwiązywania problemów, prawdopodobnie więcej, myślałem, że w końcu jestem w biznesie, ale potem otrzymałem: Model class django.contrib.contenttypes.models.ContentType doesn't declare an explicit app_label W sieci jest TAK MAŁO informacji na ten temat i żadne rozwiązanie nie rozwiązało mojego problemu. Każda rada byłaby ogromnie mile widziana. Używam …

119 python  django  python-3.x 

Jestem nowy w programowaniu w Pythonie i próbuję używać pipenv. Uruchomiłem polecenie pip install pipenv, które zakończyło się pomyślnie: ... Successfully built pipenv pathlib shutilwhich pythonz-bd virtualenv-clone Installing collected packages: virtualenv, pathlib, shutilwhich, backports.shutil-get-terminal-size, pythonz-bd, virtualenv-clone, pew, first, six, click, pip-tools, certifi, chardet, idna, urllib3, requests, pipenv ... Jednak po …

119 python  python-3.x  pip  pipenv 

Mam ciąg w formacie base64, który reprezentuje obraz PNG. Czy istnieje sposób na zapisanie tego obrazu w systemie plików jako plik PNG? Zakodowałem obraz używając flexa. Właściwie to otrzymuję na serwerze (nie widzę żadnego obrazu po żadnej z proponowanych metod :() 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119 python  image 

Chciałbym dołączyć ciąg na początku każdej wartości we wspomnianej kolumnie ramki danych pandy (elegancko). Dowiedziałem się już, jak to zrobić i obecnie używam: df.ix[(df['col'] != False), 'col'] = 'str'+df[(df['col'] != False), 'col'] Wydaje się to cholernie nieeleganckie - czy znasz inny sposób (który może również dodaje znak do wierszy, w …

119 python  string  pandas  dataframe 

Właśnie zainstalowałem Python 3.6.1 dla MacOS X Kiedy próbuję uruchomić konsolę (lub cokolwiek uruchomić z Python3), pojawia się ten błąd: AttributeError: module 'enum' has no attribute 'IntFlag' $ /Library/Frameworks/Python.framework/Versions/3.6/bin/python3 Failed to import the site module Traceback (most recent call last): File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 544, in <module> main() File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line …

119 python  python-3.x  enums  python-3.6  attributeerror 

Niedawno przeniosłem się do Pythona 3.5 i zauważyłem, że nowy operator mnożenia macierzy (@) czasami zachowuje się inaczej niż operator kropki numpy . Na przykład dla tablic 3D: import numpy as np a = np.random.rand(8,13,13) b = np.random.rand(8,13,13) c = a @ b # Python 3.5+ d = np.dot(a, b) …

119 python  numpy  matrix-multiplication  python-3.5 

Myślę, że to powinno być proste, ale wypróbowałem kilka pomysłów i żaden z nich nie zadziałał: last_row = len(DF) DF = DF.drop(DF.index[last_row]) #<-- fail! Próbowałem używać wskaźników ujemnych, ale to również prowadziło do błędów. Nadal nie rozumiem czegoś podstawowego.

119 python  pandas 

Jak zainicjować wagi i odchylenia (na przykład z inicjalizacją He lub Xavier) w sieci w PyTorch?

119 python  neural-network  deep-learning  pytorch 

W Pythonie (sprawdzałem tylko z Pythonem 3.6, ale uważam, że powinno to wytrzymać również wiele poprzednich wersji): (0, 0) == 0, 0 # results in a two element tuple: (False, 0) 0, 0 == (0, 0) # results in a two element tuple: (0, False) (0, 0) == (0, 0) …

118 python  tuples  operator-precedence 

Czy istnieje odniesienie do rozmiaru pamięci struktury danych Pythona na platformach 32- i 64-bitowych? Jeśli nie, byłoby miło mieć go na SO. Im bardziej wyczerpujący, tym lepiej! Ile bajtów jest używanych przez następujące struktury Pythona (w zależności od lentypu zawartości i, jeśli ma to zastosowanie)? int float odniesienie str ciąg …

118 python  memory  memory-footprint