Why is this result when running in python3?

高一鹏 2018-05-31 19:01:44 0 0 1086

python-pip - Switch the python version under win10. The library python3 installed by pip for python2.7 cannot be used. Please tell me how to switch the Python version freely.

There are two versions of Python installed in win10, but the libraries installed by pip cannot be shared, and the version installed by pip cannot be switched. I want to know how to solve it! ! !

为情所困 2017-07-05 11:02:01 0 3 1673

How to handle file non-existence exception in Python3 with open?

{Code...} The above code snippet can read data.json. The question is, what should I do if data.json does not exist? I searched on Google, and most of them introduced with. Unfortunately, my English is not very good, so maybe I missed something... My expectation is: if data.json does not...

阿神 2017-07-05 10:34:57 0 2 790

python3 failed to insert data into mongodb (check Mongovue, there is no data in the database), but no error was reported when the program ran.

The code is as follows: {Code...} After the execution is completed, check Mongovue and the displayed result is as shown below: The collection is empty. Is this what is the reason? But when you use another third-party management tool to view it, you can see the created tables and data: So is the prob...

伊谢尔伦 2017-07-03 11:41:06 0 1 1244

python - matplotlib error after installation

An error occurs: {code...} The solution found on the Internet is to install the python3-tk package: However, this package cannot be found in the ubuntu17.04 I am using. Can you please provide a solution?

滿天的星座 2017-06-28 09:26:09 0 1 785

python3.x - Why can't python find the module even after setting the .pth file?

My python is version 3.5.2. I have a helloworld.py module, which has a show function that outputs "Hello World". I put this module under the pck folder, and then put the pck folder under the C drive. Then, modify it in the site-packages directory of the python installation path...

伊谢尔伦 2017-06-28 09:25:47 0 2 777

python - Using Scrapy, how to request a new URL and call back the specified function?

Regarding the use of Scrapy under Python3 {code...} When I execute the above code, I cannot successfully call json_url and the corresponding response function get_score. What's wrong?

仅有的幸福 2017-06-28 09:25:02 0 1 698

python3.x - Python3 socket sendall appears 10057

When I was learning python to make a small example of socket, I found that as long as sendall is used, the following problems will occur. server_demo: {code...} client_demo: {code...} After searching many solutions, I tried to turn off the firewall. But it still didn't work.

怪我咯 2017-06-28 09:24:18 0 1 700

python3.x - Java calls python, and the python code stops automatically, and the reason cannot be found

{Code...} Calling the python code takes a long time to execute. It is estimated to take several hours, about five or six hours. If you execute the Python command directly in the shell alone, there will be no problem; however, if you use java to call python in this way, there will be a problem: after...

習慣沉默 2017-06-28 09:23:50 0 3 747

aiohttp is installed in python3, but the import still fails when entering python3.

The virtual machine environment is Ubuntu - 64-bit pip is installed under python3. When using pip to install aiohttp, it shows that it has been installed in python3, but then entering python to import the aiohttp module still fails. What should I do?

淡淡烟草味 2017-06-28 09:22:08 0 2 763

python3.x - Problem with Python not operator

{Code...} {Code...} As above, False will be calculated as 0 when operated directly. When using the logical operator not, the value of not(1) is False or 0. But why does not(1) directly enter the arithmetic operation and then the result of recalculation is False? This is similar to Python's algorithm...

phpcn_u1582 2017-06-22 11:52:39 0 3 971

python3.x - Python中出现AttributeError: object has no attribute

A Python spaceship game code written according to the book is also written according to the book, but I don’t know where the problem lies {code...} There is no problem when running the spaceship to move left and right, but when A problem occurred when creating bullets and happening. Here is the spec...

phpcn_u1582 2017-06-22 11:52:28 0 4 2033

How to call python2 from python3 program?

I need to call an independent module written in python2 (pass some parameters) in a program written in python3. Is there a more elegant way besides using subprocess?

PHP中文网 2017-06-22 11:52:14 0 3 721

python3.x - About Python graph traversal operations

I just created a graph and wanted to perform depth traversal and breadth traversal, but only one data will appear during the second traversal. I feel that it is because I set self.visited[node] = True in the previous traversal, but I don’t know how to proceed. Modification, please give me some advic...

三叔 2017-06-15 09:22:00 0 1 650

python - I have a question about database insertion

Python3 or sqlite3 info = "'INSERT INTO brush_card_record(brush_card_date, brush_card_time, card_num_6061, card_num_6654) VALUES(?,?,?,?)',('2017-05-28','12:23:32', 123, 0)" cur.execute(info

某草草 2017-06-12 09:27:56 0 4 636

python3.x - When using the batch start command to run a specified Python script, as long as the path or name of the Python script contains Chinese characters, it cannot be executed. How to solve it?

All the following commands can be successfully entered and executed directly in the cmd window, but some executions will fail after being saved into a .bat file. 1.start Python C:\English\test.py (success) 2.start Python C: \English\test中文.py (failed) 3.start Python C:\中文\te...

typecho 2017-06-12 09:27:29 0 1 675

python3.x - Question 6 of getting json from python's simulated trading api with oanda

I solved the ordering problem with everyone's help in Question 3, but when I tested the historical data today, I discovered a strange thing. I want to operate on 6 currency pairs (GBP_USD, EUR_USD, USD_CAD and USD_CHF, USD_JPY, AUD_USD). I want GBP_USD, EUR_US...

PHP中文网 2017-06-12 09:27:26 0 1 621

python3.x - How to convert python3.4 programs to python2.7

How to convert python3.4 programs to python2.7, not python2.7 to python3

滿天的星座 2017-06-12 09:26:55 0 2 807

python3.x - Question 7 of getting json from python's simulated trading api with oanda

Because we are currently using a simulated account to connect to the api, it is restricted. The account_token of the api can only be used to obtain prices and cannot be used to place orders. Therefore, I hope to log in to the web version of the trading platform through simulation and obtain a sessio...

phpcn_u1582 2017-06-12 09:26:53 0 1 693

python - ubuntu using pyinstaller

The command cannot be found. It has been installed through pip3. Ubuntu uses python3, but it cannot be used. The online tutorial is to enter the installation location of pyinstaller, but the installation location of pyinstaller cannot be found.

大家讲道理 2017-06-12 09:26:48 0 2 683