Pertanyaan yang diberi tag «python»

The +=operator dalam python tampaknya beroperasi tiba-tiba pada daftar. Adakah yang bisa memberi tahu saya apa yang terjadi di sini? class foo: bar = [] def __init__(self,x): self.bar += [x] class foo2: bar = [] def __init__(self,x): self.bar = self.bar + [x] f = foo(1) g = foo(2) print f.bar …

118 python  augmented-assignment 

Saya memiliki string dalam format base64, yang mewakili gambar PNG. Apakah ada cara untuk menyimpan gambar ini ke sistem file, sebagai file PNG? Saya mengkodekan gambar menggunakan flex. Sebenarnya ini yang saya dapatkan di server (tidak dapat melihat gambar apa pun setelah salah satu metode yang diusulkan :() 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118 python  image 

Dalam kode berikut, saya membuat kelas abstrak dasar Base. Saya ingin semua kelas yang diwarisi Basemenyediakan nameproperti, jadi saya menjadikan properti ini sebagai @abstractmethod. Kemudian saya membuat subclass dari Base, disebut Base_1, yang dimaksudkan untuk menyediakan beberapa fungsionalitas, tetapi tetap abstrak. Tidak ada nameproperti di Base_1, namun python membuat objek …

118 python  properties  abstract-class  decorator 

Saya memiliki DataFrame berikut di mana salah satu kolomnya adalah objek (sel tipe daftar): df=pd.DataFrame({'A':[1,2],'B':[[1,2],[1,2]]}) df Out[458]: A B 0 1 [1, 2] 1 2 [1, 2] Output yang saya harapkan adalah: A B 0 1 1 1 1 2 3 2 1 4 2 2 Apa yang harus saya …

118 python  pandas  dataframe 

Dalam python 3.x, adalah umum untuk menggunakan anotasi tipe kembalian dari suatu fungsi, seperti: def foo() -> str: return "bar" Apa anotasi yang benar untuk tipe "void"? Saya sedang mempertimbangkan 3 opsi: def foo() -> None: bukan IMO logis, karena Nonebukan tipe, def foo() -> type(None): menggunakan sintaks terbaik yang …

118 python  annotations  void  type-hinting 

Bagaimana cara menggabungkan string dengan python? Sebagai contoh: Section = 'C_type' Gabungkan dengan Sec_untuk membentuk string: Sec_C_type

117 python  string  concatenation 

Untuk situs saya yang didukung django, saya mencari solusi mudah untuk mengubah halaman html dinamis ke pdf. Halaman menyertakan HTML dan grafik dari Google visualization API (yang berbasis javascript, namun menyertakan grafik tersebut adalah suatu keharusan).

117 python  html  django  pdf  pdf-generation 

Saya mendapatkan kesalahan berikut saat mencoba mengimpor dari sklearn: >>> from sklearn import svm Traceback (most recent call last): File "<pyshell#17>", line 1, in <module> from sklearn import svm File "C:\Python27\lib\site-packages\sklearn\__init__.py", line 16, in <module> from . import check_build ImportError: cannot import name check_build Saya menggunakan python 2.7, scipy-0.12.0b1 superpack, …

117 python  numpy  scipy  scikit-learn 

Di Python, apakah ada cara untuk mengikat metode tidak terikat tanpa memanggilnya? Saya menulis program wxPython, dan untuk kelas tertentu saya memutuskan akan lebih baik untuk mengelompokkan data dari semua tombol saya bersama-sama sebagai daftar tupel tingkat kelas, seperti: class MyWidget(wx.Window): buttons = [("OK", OnOK), ("Cancel", OnCancel)] # ... def …

117 python  class  methods  bind 

Saya memiliki PyCharm 1.5.4 dan telah menggunakan opsi "Open Directory" untuk membuka konten folder di IDE. Saya telah memilih Python versi 3.2 (ini muncul di bawah simpul "Perpustakaan Eksternal"). Bagaimana saya bisa memilih versi lain dari Python (yang sudah saya instal di mesin saya) sehingga PyCharm menggunakan versi itu?

117 python  configuration  pycharm 

Saya menguji threading Python dengan skrip berikut: import threading class FirstThread (threading.Thread): def run (self): while True: print 'first' class SecondThread (threading.Thread): def run (self): while True: print 'second' FirstThread().start() SecondThread().start() Ini berjalan dengan Python 2.7 di Kubuntu 11.10. Ctrl+ Ctidak akan membunuhnya. Saya juga mencoba menambahkan penangan untuk sinyal …

117 python  linux 

Saya punya beberapa contoh kode Python yang perlu saya tiru di C ++. Saya tidak memerlukan solusi khusus apa pun (seperti solusi hasil berbasis rutin bersama, meskipun itu akan menjadi jawaban yang dapat diterima juga), saya hanya perlu mereproduksi semantik dengan beberapa cara. Python Ini adalah generator urutan dasar, yang …

117 c++  python  generator  yield  coroutine 

Saya menggunakan Django Rest Framework. dan saya terus mendapatkan kesalahan Exception Type: TemplateDoesNotExist Exception Value: rest_framework/api.html Saya tidak tahu bagaimana saya salah. Ini adalah pertama kalinya saya mencoba REST Framework. Ini adalah kode. views.py import socket, json from modules.data.models import * from modules.utils import * from rest_framework import status from …

117 python  django  django-rest-framework 

Saya mencoba menerapkan closure dengan Python 2.6 dan saya perlu mengakses variabel nonlokal tetapi sepertinya kata kunci ini tidak tersedia di python 2.x. Bagaimana cara mengakses variabel nonlokal dalam closure di versi python ini?

117 python  closures  python-2.x  python-nonlocal 

Saya bertanya-tanya apakah mungkin untuk memanggil fungsi python dari kode java menggunakan jython, atau hanya untuk memanggil kode java dari python?

117 java  python  jython