Вопросы с тегом «python»

У меня есть функция ( foo), которая вызывает другую функцию ( bar). Если при вызове bar()возникает ошибка HttpError, я хочу обработать это специально, если код состояния равен 404, в противном случае повторно повысить. Я пытаюсь написать несколько модульных тестов для этой fooфункции, имитируя вызов bar(). К сожалению, я не могу …

120 python  unit-testing  python-2.7  mocking  python-mock 

db = sqlite.connect("test.sqlite") res = db.execute("select * from table") С итерацией я получаю списки, соответствующие строкам. for row in res: print row Я могу получить название столбцов col_name_list = [tuple[0] for tuple in res.description] Но есть ли какая-то функция или настройка для получения словарей вместо списка? {'col1': 'value', 'col2': 'value'} …

120 python  sql  sqlite  dictionary  dataformat 

Какой смысл '/segment/segment/'.split('/')возвращаться ['', 'segment', 'segment', '']? Обратите внимание на пустые элементы. Если вы разделяете разделитель, который оказывается в первой позиции и в самом конце строки, какое дополнительное значение он дает, чтобы пустая строка возвращалась с каждого конца?

120 python  string  split 

Насколько большим может быть список в Python? Мне нужен список примерно из 12000 элементов. Смогу ли я по-прежнему использовать методы списков, такие как сортировка и т. Д.?

120 python  list  size 

Мне нужно запустить команду оболочки асинхронно из сценария Python. Под этим я подразумеваю, что я хочу, чтобы мой скрипт Python продолжал работать, пока внешняя команда отключается и делает все, что ей нужно. Я прочитал этот пост: Вызов внешней команды в Python Затем я ушел и провел некоторое тестирование, и, похоже, …

120 python  asynchronous  subprocess  scheduler 

Я хочу создать файл из исполняемого скрипта python. import os import stat os.chmod('somefile', stat.S_IEXEC) похоже os.chmod, не «добавляет» разрешения, как это chmodделает unix . Если последняя строка закомментирована, файл имеет файловый режим -rw-r--r--, а без комментариев - файловый режим ---x------. Как я могу просто добавить u+xфлаг, сохранив при этом остальные …

120 python  chmod 

Каков самый чистый и питонический способ назначить свидание завтра? Должен быть способ лучше, чем добавлять единицу к дню, обрабатывать дни в конце месяца и т. Д.

120 python  datetime  date  time 

Я использую модуль запросов (версия 0.10.0 с Python 2.5). Я выяснил, как отправить данные в форму входа на веб-сайт и получить ключ сеанса, но я не вижу очевидного способа использовать этот ключ сеанса в последующих запросах. Может ли кто-нибудь заполнить многоточие в приведенном ниже коде или предложить другой подход? >>> …

120 python  python-requests 

Этот простой код, который просто пытается заменить точку с запятой (в i-определенных позициях) двоеточием, не работает: for i in range(0,len(line)): if (line[i]==";" and i in rightindexarray): line[i]=":" Выдает ошибку line[i]=":" TypeError: 'str' object does not support item assignment Как я могу обойти это, чтобы заменить точку с запятой двоеточием? Использование …

120 python  string 

Почему python 2.7 не включает символ Z (Zulu или нулевое смещение) в конце строки isoformat объекта datetime UTC, в отличие от JavaScript? >>> datetime.datetime.utcnow().isoformat() '2013-10-29T09:14:03.895210' В то время как в javascript >>> console.log(new Date().toISOString()); 2013-10-29T09:38:41.341Z

120 python  python-2.7  datetime  timestamp  iso8601 

Я только что узнал, что в python есть значения Truthy и Falsy, которые отличаются от нормальных Trueи False? Может кто-нибудь подробно объяснить, что такое истинные и ложные ценности? Где мне их использовать? В чем разница между правдой и Trueценностями и ложью и Falseценностями?

120 python 

У меня есть строка в формате base64, которая представляет изображение PNG. Есть ли способ сохранить это изображение в файловой системе как файл PNG? Я закодировал изображение с помощью flex. На самом деле это то, что я получаю на сервере (не вижу изображения после любого из предложенных методов :() 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120 python  image 

У меня есть следующий DataFrame, в котором один из столбцов является объектом (ячейка типа списка): df=pd.DataFrame({'A':[1,2],'B':[[1,2],[1,2]]}) df Out[458]: A B 0 1 [1, 2] 1 2 [1, 2] Мой ожидаемый результат: A B 0 1 1 1 1 2 3 2 1 4 2 2 Что мне делать для этого? …

120 python  pandas  dataframe 

Итак, в моем наборе данных есть информация по местоположению для n дат. Проблема в том, что каждая дата на самом деле является отдельным заголовком столбца. Например, CSV выглядит как location name Jan-2010 Feb-2010 March-2010 A "test" 12 20 30 B "foo" 18 20 25 Я бы хотел, чтобы это выглядело …

120 python  pandas 

Я запустил приложение в Google App Engine сразу после его выхода, чтобы поиграть с технологией и поработать над домашним проектом, о котором я думал долгое время, но так и не успел начать. Результат - BowlSK . Однако по мере того, как он разрастался и добавлялись функции, стало действительно сложно поддерживать …

119 python  google-app-engine