frogress 0.10.1
A progress tool for humans
License: MIT

# frogress - progress tool for snakes

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```
                /----------------------------------------------------------------------------------\
                |                                                                                  |
      @..@     /| [###.......] Progress: 34.2MB / 125.8MB |  25.0% | Time: 14min3s | ETA: 19min52s |
     (----)   / |                                                                                  |
    ( >__< )    \----------------------------------------------------------------------------------/
    ^^ ~~ ^^
```


frogress is small progress indication tool to be used for fast prototyping.
Why *frogress* anyway? Because it's a bar (most of the time) and it jumps on
your terminal, that's why!

- Does NOT break your workflow (in most cases there is no need to call
  progress bar to render itself)
- It can guess if you [iterate over a list](#iterate-over-a-list) (or similar iterable) ...
- or if iterate over a file ...
- or if iterate over generator - provided you know it's total length ...
- or not! (no eta, no total steps, no percentage and indicator instead of a bar
  but it works!)
- And you can easily teach it how to show progress of fat, gzipped xml file
  when using [lxml][lxml] to parse it
- Supports Python 2.6+, Python 3, PyPY
- Fully tested


## Iteration examples


### Iterate over a list

```

    >>> import frogress
    >>> items = [1, 2, 3, 4, 5]
    >>> for item in frogress.bar(items):
    ...     pass # do something with item

    [##........] Step 2/5 |  20.0% | Time: 0.1s | ETA: 0.5s

```

### Iterate over a file

```

    >>> import frogress
    >>> for line in frogress.bar(open('/path/to/file', steps_label='Progress')):
    ...     pass # do something cruel with a line

    [###.......] Progress: 3.2MB / 12.8MB |  25.0% | Time: 14min3s | ETA: 19min52s

```

### Iterate over generator

```

    >>> import frogress
    >>> count = 100
    >>> items = range(count)
    >>> for item in frogress.bar(items, steps=count):
    ...     pass # do something with item

    [#########.] Step 86/100 |  86.0% | Time: 1.2s | ETA: 7.3s
```

### Iterate over a generator with unknown total number of steps

```

    >>> import frogress
    >>> def counter():
    ...     num = 1
    ...     while True:
    ...         yield num
    ...         num += 1
    ...
    >>> items = counter()
    >>> for item in frogress.bar(items):
    ...     pass # do something with item

    [........#.] Step: 1410 | Time: 2min14s
    [.........#] Step: 1411 | Time: 2min15s
    [........#.] Step: 1412 | Time: 2min16s
    [.......#..] Step: 1413 | Time: 2min17s

```


### Iterate over gzipped xml file using lxml

The only problem with how to present a progress of file that's being processed
is the source from which frogress should extract progress information. We can
try to do this simple way (without knowledge of how much of the file is already
processed) or give ``frogress`` a *source*.


#### Simple way

```

    >>> import frogress
    >>> import gzip
    >>> from lxml.etree import iterparse
    >>> stream = gzip.open('my-fat.xml.gz')
    >>> context = iterparse(stream)
    >>> for action, element in frogress.bar(context):
    ...     pass # do something with element
    ...     element.clear() # don't forget about the memory!

    [...#......] Progress: 41923 | Time: 1h42min

```

This is perfectly fine: we passed an iterable that doesn't provide information
on how many total items there is to process - so we have an bar activity
indicator, no total steps at the progress and no ETA.

However, there is clearly a way of retrieving this information - after all this
is only a file that's being processed. And that file should be passed as
``source`` argument to the ``frogress.bar`` function.

#### Pass source

```

    >>> import frogress
    >>> import gzip
    >>> from lxml.etree import iterparse
    >>> stream = gzip.open('my-fat.xml.gz')
    >>> context = iterparse(stream)
    >>> for action, element in frogress.bar(context, source=stream.myfileobj):
    ...     pass # do something with element
    ...     element.clear() # don't forget about the memory!

    [#####.....] Progress: 73.5MB / 156.4MB |  47.3% | Time: 1h42min | ETA: 1h53min

```


Just remember to pass file that is actually processed, not a wrapper! Standard
file would be passed directly, however in example, ``gzip`` module wraps stream
it is working on and it's available as attribute ``myfileobj``. On the other
hand ``bz2`` module doesn't wrap streams. And so on. ``frogress`` can guess if
a stream is file like object, however passing proper source is responsibility
of the user.


## Spinner without actual iterable

Sometimes we just want to show that program is doing something but we don't
really know how long it would take (i.e. perform couple of API requests).

### Example

```
import frogress
import time

def cmd(s=0):
    time.sleep(s)


def main():
    with frogress.spinner("Waiting for response 1", done="OK"):
        cmd(0.5)
    with frogress.spinner("Waiting for response 2", done="Done"):
        cmd(0.5)
    with frogress.spinner("Waiting for response 3", done="All done, really!"):
        cmd(0.5)

main()

```

![demo-multi-commands-simple](https://github.com/lukaszb/frogress/assets/190381/37b62e95-9120-4fe6-a035-de17640fc326)



## Progress bar class API

Most of the time you won't need to call those API directly - ``frogress.bar``
function should work for majority of the use cases. If, however, you feel like
you need to make some customization, here we present some examples

```

    >>> import frogress
    >>> items = [1, 2, 3, 4, 5]
    >>> progressbar = frogress.Bar(items)
    >>> progressbar.step
    0
    >>> progressbar.started # it's still None
    >>> progressbar.finished # here too
    >>> for item in progressbar:
    ...     pass # process the item (it will draw progressbar during iteration)
    >>> progressbar.step
    5
    >>> progressbar.widgets
    [<BarWidget>, <ProgressWidget>, <PercentageWidget>, <EtaWidget>, <TimeWidget>]
    >>> len(progressbar)
    5
    >>> progressbar.output
    <open file '<stderr>', mode 'w' at 0x103df61e0>
    >>> progressbar.started
    datetime.datetime(2013, 5, 12, 22, 2, 26, 752454)
    >>> progressbar.finished
    datetime.datetime(2013, 5, 12, 22, 2, 26, 792901)

```

## Tips & Tricks

### How to change label of the progress widget

```

    >>> import frogress
    >>> items = [1, 2, 3, 4, 5]
    >>> widgets = [frogress.BarWidget, frogress.ProgressWidget('Items: '), frogress.TimerWidget]
    >>> for item in frogress.bar(items, widgets=widgets):
    >>>     pass


```
[lxml]: http://lxml.de/