python-3.6

问题 I want to do a program in python (3.6.5) that tell the length of e.g. 1/7. The output should be for this example something like: "length: 6, repeated numbers: 142857". I got this so far: n = int(input("numerator: ")) d = int(input("denominator: ")) def t(n, d): x = n * 9 z = x k = 1 while z % d: z = z * 10 + x k += 1 print ("length:", k) print ("repeated numbers:", t) return k, z / d t(n, d) 回答1: Doing print ("repeated numbers:", t) prints the representation of the t function itself, not its

问题 I want to do a program in python (3.6.5) that tell the length of e.g. 1/7. The output should be for this example something like: "length: 6, repeated numbers: 142857". I got this so far: n = int(input("numerator: ")) d = int(input("denominator: ")) def t(n, d): x = n * 9 z = x k = 1 while z % d: z = z * 10 + x k += 1 print ("length:", k) print ("repeated numbers:", t) return k, z / d t(n, d) 回答1: Doing print ("repeated numbers:", t) prints the representation of the t function itself, not its

问题 I am trying to install QuantLib and Python QuantLib-SWIG on Mac OSX 10.12.5 Sierra and Python 3.6.1., but get error messages: ImportError: dlopen(build/lib.macosx-10.7-x86_64- 3.6/QuantLib/_QuantLib.cpython-36m-darwin.so, 2): Symbol not found: __ ZN8QuantLib10DateParser14parseFormattedERKSsS2_ Referenced from: build/lib.macosx-10.7-x86_64- 3.6/QuantLib/_QuantLib.cpython-36m-darwin.so Expected in: flat namespace in build/lib.macosx-10.7-x86_64-3.6/QuantLib/_QuantLib.cpython-36m-darwin.so as

问题 I am well aware that if you have a class method that uses the enum's class name for type hinting, there is a hack to get it to work for Python 3.6 and below. Instead of... class Release(Enum): ... @classmethod def get(cls, release: Release): ... You need to use the string value like so... class Release(Enum): ... @classmethod def get(cls, release: "Release"): ... I believe in Python 3.7 and above there is a pythonic way around this "hack" where you don't have to use quotes. The reason is

问题 I am well aware that if you have a class method that uses the enum's class name for type hinting, there is a hack to get it to work for Python 3.6 and below. Instead of... class Release(Enum): ... @classmethod def get(cls, release: Release): ... You need to use the string value like so... class Release(Enum): ... @classmethod def get(cls, release: "Release"): ... I believe in Python 3.7 and above there is a pythonic way around this "hack" where you don't have to use quotes. The reason is

问题 I am well aware that if you have a class method that uses the enum's class name for type hinting, there is a hack to get it to work for Python 3.6 and below. Instead of... class Release(Enum): ... @classmethod def get(cls, release: Release): ... You need to use the string value like so... class Release(Enum): ... @classmethod def get(cls, release: "Release"): ... I believe in Python 3.7 and above there is a pythonic way around this "hack" where you don't have to use quotes. The reason is

问题 The [f'str'] for string formatting was recently introduced in python 3.6. link. I'm trying to compare the .format() and f'{expr} methods. f ' <text> { <expression> <optional !s, !r, or !a> <optional : format specifier> } <text> ... ' Below is a list comprehension that converts Fahrenheit to Celsius. Using the .format() method it prints the results as float to two decimal points and adds the string Celsius: Fahrenheit = [32, 60, 102] F_to_C = ['{:.2f} Celsius'.format((x - 32) * (5/9)) for x in

问题 I've had a big problem with debugging in VSCODE lately. I have tried to fix it my self by searching the site and reinstalling some of my extensions. Instead of showing my results in the debug console it writes the following output to my terminal : cd /Users/AVFL/Documents/Programming ; env "PYTHONIOENCODING=UTF-8" PYTHONUNBUFFERED=1" /usr/local/bin/python3 /Users/AVFL/.vscode/extensions/ms-python.python-2018.3.1/pythonFiles/PythonTools/visualstudio_py_launcher.py /Users/AVFL/Documents

问题 I have a dictionary where some of the keys are Enum instances (subclasses of enum.Enum). I am attempting to encode the dictionary into a JSON string using a custom JSON Encoder class as per the documentation. All I want is to have the keys in the outputted JSON be the strings of the Enum names. For example { TestEnum.one : somevalue } would be encoded to { "one" : somevalue } . I have written a simple test case, shown below, which I have tested in a clean virtualenv: import json from enum

问题 I'm trying to get timing information for all my API endpoints based on the OpenAPI JSON, so I would like to do something like this in the setup method: for api_path in self.client.get('/api/doc/?format=openapi').json()['paths'].keys(): self.get_[api_path] = [@task decorated method which retrieves the API path] Or is there another way to generate tasks at runtime? 回答1: Found it in the API docs: def setup(self) -> None: for api_path in self.client.get('/api/doc/?format=openapi').json()['paths']