Python Progress Bar

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礼貌的吻别
礼貌的吻别 2020-11-22 06:13

How do I use a progress bar when my script is doing some task that is likely to take time?

For example, a function which takes some time to complete and returns

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  • 2020-11-22 06:52

    Here's a short solution that builds the loading bar programmatically (you must decide how long you want it).

    import time
    
    n = 33  # or however many loading slots you want to have
    load = 0.01  # artificial loading time!
    loading = '.' * n  # for strings, * is the repeat operator
    
    for i in range(n+1):
        # this loop replaces each dot with a hash!
        print('\r%s Loading at %3d percent!' % (loading, i*100/n), end='')
        loading = loading[:i] + '#' + loading[i+1:]
        time.sleep(load)
    
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  • 2020-11-22 06:53

    It is quite straightforward in Python3:

       import time
       import math
    
        def show_progress_bar(bar_length, completed, total):
            bar_length_unit_value = (total / bar_length)
            completed_bar_part = math.ceil(completed / bar_length_unit_value)
            progress = "*" * completed_bar_part
            remaining = " " * (bar_length - completed_bar_part)
            percent_done = "%.2f" % ((completed / total) * 100)
            print(f'[{progress}{remaining}] {percent_done}%', end='\r')
    
        bar_length = 30
        total = 100
        for i in range(0, total + 1):
            show_progress_bar(bar_length, i, total)
            time.sleep(0.1)
    
        print('\n')
    
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  • 2020-11-22 06:55

    There are specific libraries (like this one here) but maybe something very simple would do:

    import time
    import sys
    
    toolbar_width = 40
    
    # setup toolbar
    sys.stdout.write("[%s]" % (" " * toolbar_width))
    sys.stdout.flush()
    sys.stdout.write("\b" * (toolbar_width+1)) # return to start of line, after '['
    
    for i in xrange(toolbar_width):
        time.sleep(0.1) # do real work here
        # update the bar
        sys.stdout.write("-")
        sys.stdout.flush()
    
    sys.stdout.write("]\n") # this ends the progress bar
    

    Note: progressbar2 is a fork of progressbar which hasn't been maintained in years.

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  • 2020-11-22 06:55

    Use this library: fish (GitHub).

    Usage:

    >>> import fish
    >>> while churning:
    ...     churn_churn()
    ...     fish.animate()
    

    Have fun!

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  • 2020-11-22 06:55

    A very simple approach:

    def progbar(count: int) -> None:
        for i in range(count):
            print(f"[{i*'#'}{(count-1-i)*' '}] - {i+1}/{count}", end="\r")
            yield i
        print('\n')
    

    And the usage:

    from time import sleep
    
    for i in progbar(10):
        sleep(0.2) #whatever task you need to do
    
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  • 2020-11-22 06:56

    With tqdm (conda install tqdm or pip install tqdm) you can add a progress meter to your loops in a second:

    from time import sleep
    from tqdm import tqdm
    for i in tqdm(range(10)):
        sleep(3)
    
     60%|██████    | 6/10 [00:18<00:12,  0.33 it/s]
    

    Also, there is a notebook version:

    from tqdm.notebook import tqdm
    for i in tqdm(range(100)):
        sleep(3)
    

    You can use tqdm.auto instead of tqdm.notebook to work in both a terminal and notebooks.

    tqdm.contrib contains some helper functions to do things like enumerate, map, and zip. There are concurrent maps in tqdm.contrib.concurrent.

    You can even get progress sent to your phone after disconnecting from a jupyter notebook using tqdm.contrib.telegram or tqdm.contrib.discord.

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