An easy module for building data pipe in python.

## Project description

# pypeup - Piping Up with Python

[![Build Status](https://travis-ci.org/dboyliao/pypeup.svg?branch=master)](https://travis-ci.org/dboyliao/pypeup)

This is a simple python module to help you to build a data pipe in python.

## First Glance

Suppose you have a bunch of functions dealing with data of the same structure (e.g they are all `array`, `integer`, ...etc) and you want to pipe them up for complex computations, `pypeup` is here at your service.

With `pypeup`, you can write something like this:

```{python}

from pypeup import DataPipe

# Note that these two funtion all return the same data structure and their

# first arguments are all data.

# In this example, the data are all of type list.

def fun1(data, x):

"""

x: <number>

data: <list>

"""

return [a + x for a in data]

def fun2(data, ind):

"""

ind: <integer>

data: <list>

"""

return data[:min(ind, len(data) - 1)]

class MyPipe(DataPipe):

pass

my_pipe = MyPipe([1, 2, 3, 4, 5])

my_pipe.register(fun1) # Use register method to add any method you like

my_pipe.register(fun2) # for your data.

my_pipe.fun1(1).fun2(3).fun2(2).fun1(3) # Pipe the function up at your wish

my_pipe.data # Access the data by the `data` attribute

# >>> [5, 6]

```

Also, you can build up the pipe by one class declairation:

```{python}

from pypeup import DataPipe

import numpy as np

class MyPipe2(DataPipe):

def add(self, x):

return self.data + x

def sub(self, x):

return self.data - x

def mul(self, x):

return self.data * x

pipe2 = MyPipe2(np.array([1, 2, 3]))

pipe2.add(3).sub(2).mul(4)

pipe2.data

# >>> np.array([8, 12, 16])

```

You can use private method as normal python:

```{python}

from pypeup import DataPipe

import math

class MyPipe(DataPipe):

def fun(self, x):

return self._magic(x)

def _magic(self, x):

print "Where the magic happens!"

return self.data + math.sin(x)

pipe = MyPipe(0.)

print pipe.fun(math.pi / 2).data

# >>> Where the magic happens!

# >>> 1.

```

In order to protect the data inside the pipe, any modification to the `data` which is outside of the execution context of the methods of the pipe is not allowed and an `ExecutionContextError` will be raised.

```{python}

from pypeup import DataPipe

class MyPipe(DataPipe):

def addOne(self):

return self.data + 1

pipe = MyPipe(10)

pipe.addOne(1) # OK.

pipe.data = 11 # Not OK.

```

There are some limits on the functions which can be applied to `pypeup`.

See [Limits](https://github.com/dboyliao/pypipe#limits) for detail.

## Limits

As mentioned above, there are few limits on the functions that can be used with `pypeup`:

- The current data can be access through `self.data`.

- `self.data` is a `property` defined in `DataPipe`, which means that if you want to overwrite it, you must be sure your implementation is OK.

- All the functions' first argument must be `data`. (But not method, see below)

- It doesn't mean you have to name it as `data`, but you have to be sure that all the functions' first argument will hold the data you want to process.

- If the function is defined as an instance method, you only need to pass all the parameters needed to work with the data which can be access through `self.data`.

- If the instance method is private method (method with the name start with `_` or `__`) will work just like normal instance method.

- All the `data` must be of the same (or compatible) data structure or type.

- for example, they must be all `list`, `number`, `numpy.array`...etc.

- All the function must return the data which will be passed through the pipe.

## Installation

- Install through `pip`:

- Just run `pip install pypeup`

- Install from source:

- run `git clone https://github.com/dboyliao/pypeup.git && cd pypeup`

- run `python setup.py install` to install the package.

## Tests

- If you haven't installed `nose` yet, run `pip install -r requirements.txt` first.

- run `nosetests`

[![Build Status](https://travis-ci.org/dboyliao/pypeup.svg?branch=master)](https://travis-ci.org/dboyliao/pypeup)

This is a simple python module to help you to build a data pipe in python.

## First Glance

Suppose you have a bunch of functions dealing with data of the same structure (e.g they are all `array`, `integer`, ...etc) and you want to pipe them up for complex computations, `pypeup` is here at your service.

With `pypeup`, you can write something like this:

```{python}

from pypeup import DataPipe

# Note that these two funtion all return the same data structure and their

# first arguments are all data.

# In this example, the data are all of type list.

def fun1(data, x):

"""

x: <number>

data: <list>

"""

return [a + x for a in data]

def fun2(data, ind):

"""

ind: <integer>

data: <list>

"""

return data[:min(ind, len(data) - 1)]

class MyPipe(DataPipe):

pass

my_pipe = MyPipe([1, 2, 3, 4, 5])

my_pipe.register(fun1) # Use register method to add any method you like

my_pipe.register(fun2) # for your data.

my_pipe.fun1(1).fun2(3).fun2(2).fun1(3) # Pipe the function up at your wish

my_pipe.data # Access the data by the `data` attribute

# >>> [5, 6]

```

Also, you can build up the pipe by one class declairation:

```{python}

from pypeup import DataPipe

import numpy as np

class MyPipe2(DataPipe):

def add(self, x):

return self.data + x

def sub(self, x):

return self.data - x

def mul(self, x):

return self.data * x

pipe2 = MyPipe2(np.array([1, 2, 3]))

pipe2.add(3).sub(2).mul(4)

pipe2.data

# >>> np.array([8, 12, 16])

```

You can use private method as normal python:

```{python}

from pypeup import DataPipe

import math

class MyPipe(DataPipe):

def fun(self, x):

return self._magic(x)

def _magic(self, x):

print "Where the magic happens!"

return self.data + math.sin(x)

pipe = MyPipe(0.)

print pipe.fun(math.pi / 2).data

# >>> Where the magic happens!

# >>> 1.

```

In order to protect the data inside the pipe, any modification to the `data` which is outside of the execution context of the methods of the pipe is not allowed and an `ExecutionContextError` will be raised.

```{python}

from pypeup import DataPipe

class MyPipe(DataPipe):

def addOne(self):

return self.data + 1

pipe = MyPipe(10)

pipe.addOne(1) # OK.

pipe.data = 11 # Not OK.

```

There are some limits on the functions which can be applied to `pypeup`.

See [Limits](https://github.com/dboyliao/pypipe#limits) for detail.

## Limits

As mentioned above, there are few limits on the functions that can be used with `pypeup`:

- The current data can be access through `self.data`.

- `self.data` is a `property` defined in `DataPipe`, which means that if you want to overwrite it, you must be sure your implementation is OK.

- All the functions' first argument must be `data`. (But not method, see below)

- It doesn't mean you have to name it as `data`, but you have to be sure that all the functions' first argument will hold the data you want to process.

- If the function is defined as an instance method, you only need to pass all the parameters needed to work with the data which can be access through `self.data`.

- If the instance method is private method (method with the name start with `_` or `__`) will work just like normal instance method.

- All the `data` must be of the same (or compatible) data structure or type.

- for example, they must be all `list`, `number`, `numpy.array`...etc.

- All the function must return the data which will be passed through the pipe.

## Installation

- Install through `pip`:

- Just run `pip install pypeup`

- Install from source:

- run `git clone https://github.com/dboyliao/pypeup.git && cd pypeup`

- run `python setup.py install` to install the package.

## Tests

- If you haven't installed `nose` yet, run `pip install -r requirements.txt` first.

- run `nosetests`

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