progiter 1.2.0

Example

The basic usage of ProgIter is simple and intuitive. Just wrap a python iterable. The following example wraps a range iterable and prints reported progress to stdout as the iterable is consumed. The ProgIter object accepts various keyword arguments to modify the details of how progress is measured and reported. See API documentation of the ProgIter class here: https://progiter.readthedocs.io/en/latest/progiter.progiter.html#progiter.progiter.ProgIter

Note that by default ProgIter reports information about iteration-rate, fraction-complete, estimated time remaining, time taken so far, and the current wall time.

>>> from progiter import ProgIter
>>> def is_prime(n):
...     return n >= 2 and not any(n % i == 0 for i in range(2, n))
>>> for n in ProgIter(range(1000), verbose=2):
>>>     # do some work
>>>     is_prime(n)
   0/1000... rate=0 Hz, eta=?, total=0:00:00, wall=12:47 EST
   1/1000... rate=58551.44 Hz, eta=0:00:00, total=0:00:00, wall=12:47 EST
 257/1000... rate=317349.77 Hz, eta=0:00:00, total=0:00:00, wall=12:47 EST
 642/1000... rate=191396.29 Hz, eta=0:00:00, total=0:00:00, wall=12:47 EST
1000/1000... rate=139756.95 Hz, eta=0:00:00, total=0:00:00, wall=12:47 EST

For more complex applications is may sometimes be desireable to manually use the ProgIter API. This is done as follows:

>>> from progiter import ProgIter
>>> n = 3
>>> prog = ProgIter(desc='manual', total=n, verbose=3)
>>> prog.begin() # Manually begin progress iteration
>>> for _ in range(n):
...     prog.step(inc=1)  # specify the number of steps to increment
>>> prog.end()  # Manually end progress iteration
manual 0/3... rate=0 Hz, eta=?, total=0:00:00, wall=12:46 EST
manual 1/3... rate=12036.01 Hz, eta=0:00:00, total=0:00:00, wall=12:46 EST
manual 2/3... rate=16510.10 Hz, eta=0:00:00, total=0:00:00, wall=12:46 EST
manual 3/3... rate=20067.43 Hz, eta=0:00:00, total=0:00:00, wall=12:46 EST

When working with ProgIter in either iterable or manual mode you can use the prog.ensure_newline method to guarantee that the next call you make to stdout will start on a new line. You can also use the prog.set_extra method to update a dynamic “extra” message that is shown in the formatted output. The following example demonstrates this.

>>> from progiter import ProgIter
>>> def is_prime(n):
...     return n >= 2 and not any(n % i == 0 for i in range(2, n))
>>> _iter = range(1000)
>>> prog = ProgIter(_iter, desc='check primes', verbose=2)
>>> for n in prog:
>>>     if n == 97:
>>>         print('!!! Special print at n=97 !!!')
>>>     if is_prime(n):
>>>         prog.set_extra('Biggest prime so far: {}'.format(n))
>>>         prog.ensure_newline()
check primes    0/1000... rate=0 Hz, eta=?, total=0:00:00, wall=12:55 EST
check primes    1/1000... rate=98376.78 Hz, eta=0:00:00, total=0:00:00, wall=12:55 EST
!!! Special print at n=97 !!!
check primes  257/1000...Biggest prime so far: 251 rate=308037.13 Hz, eta=0:00:00, total=0:00:00, wall=12:55 EST
check primes  642/1000...Biggest prime so far: 641 rate=185166.01 Hz, eta=0:00:00, total=0:00:00, wall=12:55 EST
check primes 1000/1000...Biggest prime so far: 997 rate=120063.72 Hz, eta=0:00:00, total=0:00:00, wall=12:55 EST

Installation

ProgIter can be easily installed via pip.

pip install progiter

Alternatively, the ubelt library ships with its own version of ProgIter. Note that the ubelt version of progiter is distinct (i.e. ubelt actually contains a copy of this library), but the two libraries are generally kept in sync.