python-3.6

问题 I am trying to fetch banner from sever using below code. But the result always says "None", even thought banner exists. I have tried with Python 2 and 3, Paramiko 2.4 and 2.7.0, same result as "None". Can anyone correct/help me? The code is based on: Is there a way using paramiko and python to get the banner of the ssh server you connected to? The banner is configured in sshd_config using Banner directive. # !/usr/bin/python import paramiko def grab_banner(ip_address, port): client = paramiko

问题 I'm trying to write PEP-8 compliant code for a domestic project (I must admit that those are my first steps in the python world) and i've got a f-string that is more than 80 char long - the solid thin line near the dot at self.text is the 80 char mark. (Sorry for the sad link without preview but i must have 10+ rep to post 'em) I'm trying to split it into different lines in the most pythonic way but the only aswer that actually works is an error for my linter Working Code: def __str__(self):

问题 I am trying to install Python 3.6.9 and am having problems. First I downloaded Python-3.6.9-tgz, then extracted it to get Python-3.6.9.tar, then extracted that to get a folder called Python-3.6.9 This has setup.py in it. So on windows 10 I opened the command prompt and navigated to that folder and typed: setup.py install . This opens up visual studio that I already have and does nothing. Please let me know if I need to do something else. I tried to add environmental variables but nothing has

问题 I'm trying to figure out a way to make it to when I hold down a key the player will constantly move, or just have the player move forward constantly with just turtle graphics, (I do have pygame installed also) import turtle from turtle import * #Setup Screen wn = turtle.Screen() wn.setup(700,700) wn.title("white") wn.bgcolor("black") #Create Player player = turtle.Turtle() player.penup() player.shape("triangle") player.color("white") def forward(): player.forward(20) def lef(): player.left(90

问题 i am writing an API in python django rest framework and i am stuck at creating a serializer field for an ENUM, how can i create a serializer field for an ENUM field. my model code is: class Queue(models.Model): class Meta: db_table = 'queues' id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True) name = models.CharField(max_length=45) type = EnumChoiceField(QueueTypes, default=QueueTypes.pending) date = models.DateTimeField(auto_now=True) and i am writing a

问题 i am writing an API in python django rest framework and i am stuck at creating a serializer field for an ENUM, how can i create a serializer field for an ENUM field. my model code is: class Queue(models.Model): class Meta: db_table = 'queues' id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, unique=True) name = models.CharField(max_length=45) type = EnumChoiceField(QueueTypes, default=QueueTypes.pending) date = models.DateTimeField(auto_now=True) and i am writing a

问题 In Python 3.6, I am able to use yield inside a coroutine. However I am not able to use yield from . Below is my code. On line 3 I await another coroutine. On line 4 I try to yield from a file. Why won't Python 3.6 allow me to do that? async def read_file(self, filename): with tempfile.NamedTemporaryFile(mode='r', delete=True, dir='/tmp', prefix='sftp') as tmp_file: await self.copy_file(filename, tmp_file) yield from open(tmp_file) Here's the exception Python 3.6 raises for the above code:

问题 In Python 3.6, I am able to use yield inside a coroutine. However I am not able to use yield from . Below is my code. On line 3 I await another coroutine. On line 4 I try to yield from a file. Why won't Python 3.6 allow me to do that? async def read_file(self, filename): with tempfile.NamedTemporaryFile(mode='r', delete=True, dir='/tmp', prefix='sftp') as tmp_file: await self.copy_file(filename, tmp_file) yield from open(tmp_file) Here's the exception Python 3.6 raises for the above code:

问题 I would like to have a mechanism which evaluates an f-string where the contents to be evaluated are provided inside a variable. For example, x=7 s='{x+x}' fstr_eval(s) For the usage case I have in mind, the string s may arise from user input (where the user is trusted with eval ). While using eval in production is generally very bad practice, there are notable exceptions. For instance, the user may be a Python developer, working on a local machine, who would like to use full Python syntax to

问题 Code in question: a = 'test' # 1) print(f'{a}') # test # 2) print(f'{ {a} }') # {'test'} # 3) print(f'{{ {a} }}') # {test} My question is, why does case two print those quotes? I didn't find anything explicitly in the documentation. The closest thing I found detailing this was in the PEP for this feature: (the grammar for F-strings) f ' <text> { <expression> <optional !s, !r, or !a> <optional : format specifier> } <text> ... ' The expression is then formatted using the format protocol, using