Update setup_instruction.md

setup/setup_instruction.md

@@ -43,17 +43,31 @@ Step 4: set up a project directory. You will do all work for this class in this
 $ mkdir cs20
 ```
 
-Step 5: set up virtual environment with python3
+Step 5: set up virtual environment with python3  *Different if you are using Anaconda*
 ```bash
 $ cd cs20
 $ python3 -m venv .env
 ```
+*If you find this error efter the last command, you probably have Anaconda installed*
+```bash
+Error: Command '['home/user/cs20/.env/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1.
+```
+You need to create the environment without pip, and installing it later, as stated [here](https://github.com/ContinuumIO/anaconda-issues/issues/6917)
+
+Instead of **`$ python3 -m venv .env`**, write:
+```bash
+$ python3 -m venv --without-pip .env
+```
 These commands create a venv subdirectory in your project where everything is installed.
 
 Step 6: activate the virtual environment 
 ```bash
 $ source .env/bin/activate
 ```
+If you created the virtual environment with the option `--without-pip`, you have to install it now. Type:
+```bash
+curl https://bootstrap.pypa.io/get-pip.py | python
+```
 
 If you type:
 ```bash
@@ -84,4 +98,4 @@ If you have problem with using Matplotlib in virtual environment, here are two s
 Go there and create a file ~/.matplotlib/matplotlibrc there and add the following code: ```backend: TkAgg```
 2. After importing matplotlib, simply add: ```matplotlib.use("TkAgg")```
 
-If you run into more problems, feel free to post your questions on [Piazza](https://piazza.com/stanford/winter2018/cs20) or email us cs20-win1718-staff@lists.stanford.edu.
+If you run into more problems, feel free to post your questions on [Piazza](https://piazza.com/stanford/winter2018/cs20) or email us cs20-win1718-staff@lists.stanford.edu.