Запитання з тегом «python»

Який самий ідіоматичний спосіб досягти чогось подібного в Haskell: foldl (+) 0 [1,2,3,4,5] --> 15 Або його еквівалент у Ruby: [1,2,3,4,5].inject(0) {|m,x| m + x} #> 15 Очевидно, що Python забезпечує reduceфункцію, яка є реалізацією складки, точно так само, як вище, однак мені сказали, що "пітонічним" способом програмування було уникати …

117 python  list  functional-programming  reduce  fold 

Я встановив Anaconda3 4.4.0 (32 біт) на своїй машині Windows 7 Professional і імпортував NumPy та Pandas на ноутбук Jupyter, тому я припускаю, що Python був встановлений правильно. Але коли я набираю conda listі conda --versionв командному рядку, він говоритьconda is not recognized as internal or external command. Я встановив …

117 python  anaconda  conda  data-science 

Я хочу структурувати свою програму Flask приблизно так: ./site.py ./apps/members/__init__.py ./apps/members/models.py apps.members являє собою колбу. Тепер для створення модельних класів мені потрібно застосувати додаток, наприклад: # apps.members.models from flask import current_app from flaskext.sqlalchemy import SQLAlchemy db = SQLAlchemy(current_app) class Member(db.Model): # fields here pass Але якщо я спробую імпортувати цю …

117 python  flask  flask-sqlalchemy 

Ось мій код: 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']) Коли я запускаю цей код, я отримую таку помилку: 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 occurred: …

117 python  pandas  reverse 

Я створив новий додаток з деякими моделями, і тепер я помітив, що деякі з моделей погано продумані. Оскільки я не вчинив код, розумним було б перенести базу даних до останнього хорошого стану та повторити міграцію з кращими моделями. У цьому випадку останнім хорошим станом є база даних, де нової програми …

117 python  django  django-1.7  django-migrations 

У мене є рядок у форматі base64, який представляє зображення PNG. Чи є спосіб зберегти це зображення у файловій системі як файл PNG? Я кодував зображення за допомогою флексу. Насправді це те, що я отримую на сервері (не бачу жодного зображення після жодного із запропонованих методів :() 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117 python  image 

У чому різниця між subprocess.Popen()і os.system()?

117 python  subprocess  system 

Іноді здається, що параметр за замовчуванням є порожнім списком. І все ж Python надає несподівану поведінку в цих ситуаціях . Наприклад, у мене є функція: def my_func(working_list = []): working_list.append("a") print(working_list) Перший раз, коли він називається за замовчуванням, спрацює, але дзвінки після цього оновлять існуючий список (з одним "a" кожним …

117 python  python-3.x 

Наразі це запитання не підходить для нашого формату запитань. Ми очікуємо, що відповіді будуть підкріплені фактами, посиланнями або експертними знаннями, але це питання, ймовірно, вимагатиме дискусій, аргументів, опитувань чи розширеної дискусії. Якщо ви вважаєте, що це питання можна вдосконалити та, можливо, знову відкрити, відвідайте довідковий центр для ознайомлення . Закрито …

116 python  coding-style 

Я намагаюся зрозуміти сферу застосування вкладених класів в Python. Ось мій приклад коду: class OuterClass: outer_var = 1 class InnerClass: inner_var = outer_var Створення класу не завершується, і я отримую помилку: <type 'exceptions.NameError'>: name 'outer_var' is not defined Спроба inner_var = Outerclass.outer_varне працює. Я отримав: <type 'exceptions.NameError'>: name 'OuterClass' is …

116 python  class  scope  nested  inner-classes 

Я намагався видалити небажані символи з заданої рядки за допомогою програми text.translate()Python 3.4. Мінімальний код: import sys s = 'abcde12345@#@$#%$' mapper = dict.fromkeys(i for i in range(sys.maxunicode) if chr(i) in '@#$') print(s.translate(mapper)) Це працює як очікувалося. Однак однакова програма при виконанні в Python 3.4 та Python 3.5 дає велику різницю. …

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

Це трохи .. марне питання, але висновок BuildBot не особливо приємно дивитись .. Наприклад, порівняно з .. phpUnderControl Дженкінс Гудсон CruiseControl.rb ..і інші, BuildBot виглядає досить .. архаїчно Зараз я граю з Хадсоном, але він дуже орієнтований на Java (хоча за допомогою цього посібника мені було легше налаштувати, ніж BuildBot, …

116 python  jenkins  continuous-integration  buildbot 

Чи можете ви запропонувати модульну функцію з numpy / scipy, яка може знайти локальні максимуми / мінімуми в 1D масиві numpy? Очевидно, найпростіший підхід колись - це подивитися на найближчих сусідів, але я хотів би прийняти рішення, яке є частиною нутрого дистрибутива.

116 python  numpy 

Зачинено. Це питання не відповідає вказівкам щодо переповнення стека . Наразі відповіді не приймаються. Хочете вдосконалити це питання? Оновіть питання, щоб воно було тематичним для переповнення стека. Закрито 5 років тому . Удосконаліть це питання Мені потрібно завантажити його на Python 2.7, але я не можу його знайти ...

116 python  winapi 

Я хочу зробити запит, який вибирає дати з Django. Я знаю, як це зробити із сирим SQL досить легко, але як це можна досягти, використовуючи ORG Django? Тут я хочу додати запит між датами 30 днів: start_date = datetime.datetime.now() + datetime.timedelta(-30) context[self.varname] = self.model._default_manager.filter( current_issue__isnull=True ).live().order_by('-created_at')

116 python  django