# Package
All the files needed for a module are contained in a package. 
* Packages are installed based on the project requirement.
* Before you install packages, check if `PIP` is installed -- if it's not installed,
download [PIP](https://pip.pypa.io/en/stable/installing/).

<b>`PIP`</b> is a package manager for Python packages or modules.
> Note:
 If you have Python version 3.4 or later, `PIP` is included by default.

## How to check the `PIP` version
Go to *command prompt* and *navigate* to the Python directory as shown:
```bash
C:\Users\Your Name\AppData\Local\Programs\Python\Python36\Scripts>pip --version
```

> Note: This is **C:\Users\Your Name\AppData\Local\Programs\Python\Python36\Scripts** Python directory in our case.




## How to download a package
1. Go to the *command prompt*.
2. Navigate to the Python Scripts directory(as shown above).
3. Now type: 
```bash
pip install package-name
```

> **Example:** C:\Users\Your Name\AppData\Local\Programs\Python\Python36\Scripts>pip install matplotlib

## How to remove a package
* Use *uninstall* to remove the package.

> **Example:** C:\Users\Your Name\AppData\Local\Programs\Python\Python36\Scripts>pip uninstall matplotlib

- It will ask whether to remove the package or not (y/n?) for confirmation.

* `y` is for removing.
* `n` is for not removing.

## Packages list
To check all the packages in Python, use the `pip list` command.

> **Example:** C:\Users\Your Name\AppData\Local\Programs\Python\Python36\Scripts>pip list

* List of installed packages will be displayed.

The same process is repeated for all the packages. 






## Code
Now, let's try some of the previously mentioned commands in the widget below:

1. Press the `run` button.
2. The console will appear in the current *Python* directory.
3. Try running commands. Example:
`pip --version`

import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


python

React

Dart

GoJS React

Typescript React

Vue.js

python3.tar.gz

Installation & uninstallation of packages in Python

Package All the files needed for a module are contained in a package.  Packages are installed based on the project requirement. Before you install packages, check if PIP is installed – if it s not installed, download PIP.  PIP is a package manager for Python packages or modules.  Note: If you have Python version 3.4 or later, PIP is included by default.  How to check the PIP version Go to command prompt and navigate to the Python directory as shown: C:\Users\Your Name\AppData\Local\Programs\Python\Python36\Scripts>pip --version   Note: This is C:\Users\Your Name\AppData\Local\Programs\Python\Python36\Scripts Python directory in our case.  