// full error message
WARNING: You are using pip version 19.2.3, however version 20.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
// run
python -m pip install --upgrade pip --user --trusted-host files.pythonhosted.org --trusted-host pypi.orgCould not install packages due to an EnvironmentError [Error 13] Permission denied:
// error message when installing a pip package
ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: 'C:\\Python38\\Lib\\site-packages\\__pycache__\\pycodestyle.cpython-38.pyc'
Consider using the `--user` option or check the permissions.
// just add --user to the command. ex:
python -m pip install autopep8 --user --trusted-host files.pythonhosted.org --trusted-host pypi.orgRepository is not clean. Please commit or stash any changes before updating
you can force ng to update anyways using --allow-dirty
ng update --all --allow-dirtyEnable CORS in .NET Core Web API
// Startup.cs
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(options =>
{
options
.AddPolicy("CorsPolicy", builder => builder
.WithOrigins("http://localhost:4200")
.AllowAnyMethod()
.AllowAnyHeader()
.AllowCredentials());
});
}
}
public void Configure(IApplicationBuilder app, IApiVersionDescriptionProvider provider)
{
app.UseCors("CorsPolicy");
}Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at . (Reason: CORS request did not succeed)
from flask_cors import CORS
app = Flask(__name__)
CORS(app)Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by ‘SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:726)’),)’: /simple/pylint/ >>>>>>>> Could not fetch URL https://pypi.python.org/simple/setuptools/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host=’pypi.python.org’, port=443): Max retries exceeded with url: /simple/setuptools/ (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:726)’),)) – skipping
// add the following flag to the pip command:
--trusted-host files.pythonhosted.org --trusted-host pypi.org// or wherever the error indicates a problem in
<error message>... HTTPSConnectionPool(host='pypi.python.org', port=443)MSBUILD : error MSB3428: Could not load the Visual C++ component “VCBuild.exe”. To fix this, 1) install the .NET Framework 2.0 SDK, 2) install Microsoft Visual Studio 2005 or 3) add the location of the component to the system path if it is installed elsewhere.
npm install -g windows-build-toolsUNABLE_TO_GET_ISSUER_CERT_LOCALLY
npm config set registry http://registry.npmjs.org/ Fix “is not digitally signed” powershell error
#Open powershell as administrator
Get-ExecutionPolicy -List
Scope ExecutionPolicy
----- ---------------
MachinePolicy Undefined
UserPolicy Undefined
Process Unrestricted
CurrentUser Unrestricted
LocalMachine Unrestricted
#Set all to Unrestricted where allowed. The first two are usually managed by group policy.
Set-ExecutionPolicy Unrestricted -Scope Process
#type Y and press enter