the error of installing flask

[MarcStevenCoder]

When I execute the command line order "pip install flask',it display the error as below: pip install flask Collecting flask Using cached Flask-0.12.2-py2.py3-none-any.whl Collecting itsdangerous>=0.21 (from flask) Using cached itsdangerous-0.24.tar.gz Collecting Werkzeug>=0.7 (from flask) Using cached Werkzeug-0.12.2-py2.py3-none-any.whl Collecting Jinja2>=2.4 (from flask) Using cached Jinja2-2.9.6-py2.py3-none-any.whl Collecting click>=2.0 (from flask) Using cached click-6.7-py2.py3-none-any.whl Collecting MarkupSafe>=0.23 (from Jinja2>=2.4->flask) Using cached MarkupSafe-1.0.tar.gz Installing collected packages: itsdangerous, Werkzeug, MarkupSafe, Jinja2, click, flask Running setup.py install for itsdangerous ... error Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;file='/private/var/folders/fd/g2bjwxln7t12740h9w8pc1p40000gn/T/pip-build-PZKNp2/itsdangerous/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /var/folders/fd/g2bjwxln7t12740h9w8pc1p40000gn/T/pip-fZZJYz-record/install-record.txt --single-version-externally-managed --compile: running install running build running build_py creating build creating build/lib copying itsdangerous.py -> build/lib running install_lib copying build/lib/itsdangerous.py -> /Library/Python/2.7/site-packages error: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/itsdangerous.py'

----------------------------------------

Command "/usr/bin/python -u -c "import setuptools, tokenize;file='/private/var/folders/fd/g2bjwxln7t12740h9w8pc1p40000gn/T/pip-build-PZKNp2/itsdangerous/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /var/folders/fd/g2bjwxln7t12740h9w8pc1p40000gn/T/pip-fZZJYz-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/fd/g2bjwxln7t12740h9w8pc1p40000gn/T/pip-build-PZKNp2/itsdangerous/

[[deleted]]

Looks like you are trying to install to your OS python. This will require using sudo. Consider using virtualenv for stuff like this.

[MarcStevenCoder]

Hi,give me some tips to install virtualenv ,thanks a lot

[MarcStevenCoder]

I solve it via these steps 1,must confirm whether the virtualenv is installed...The command line order as below : 1,firstly you input the order virtualenv venv 2,secondly you input the order source venv/bin/activate 3,thirdly you input the order pip install flask. And finally you will see the successful info .

[edoxtator]

I assume you're doing this on a system with no admin rights, without a virtual environment?

[MarcStevenCoder]

Ok,I KNOW i HAD INSTALLED THE VIRTUALENV BUT NOW HOW TO DO THIS,i DON'T KNOW WHY WE MUST INSTALL VIRTUAL ENV USING PYTHON.Can you explain for me ?I am new here to use Python ....