How to Replace Console Output with a Counter and Progress Bar in Python?

Replacing Console Output in Python

Python's versatile nature allows for custom console output to be tailored to specific needs. One common technique is creating dynamic console counters that update in place.

Query: Replacing Output with a Counter

To replace console output with a progress counter, a loop can be modified to display a status message after performing each iteration. Unlike the previous output, which included a new line for each status, this counter would update only the last displayed line.

Solution: Using 'r'

One simple solution involves inserting a carriage return character "r" before the new status message and avoiding any newline characters. This ensures that the string doesn't get shorter, making it a viable approach if the string is expected to remain consistent in length.

For example:

import sys

for i in range(5):
    sys.stdout.write("\rDoing thing %d" % i)
    sys.stdout.flush()

Enhanced Solution: Progress Bar

For more sophisticated progress displays, a progress bar can be implemented. The following code provides a simple progress bar function:

def start_progress(title):
    sys.stdout.write(title + ": [" + "-" * 40 + "]" + chr(8) * 41)
    sys.stdout.flush()
    progress_x = 0

def progress(x):
    global progress_x
    x = int(x * 40 // 100)
    sys.stdout.write("#" * (x - progress_x))
    sys.stdout.flush()
    progress_x = x

def end_progress():
    sys.stdout.write("#" * (40 - progress_x) + "]\n")
    sys.stdout.flush()

The start_progress function initializes the progress bar with a title description. progress(x) updates the bar with the percentage completion (x). Finally, end_progress finishes the progress display.

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