Progress Indicators

def bar(it, label='', width=32, hide=None, empty_char=' ', filled_char='#', expected_size=None, every=1):
    """
    Progress iterator that wraps iterables with a progress bar.
    
    Parameters:
    - it: iterable, items to iterate over
    - label: str, label to display before progress bar (default: '')
    - width: int, width of progress bar in characters (default: 32)
    - hide: bool, force hide progress bar (default: None, auto-detect TTY)
    - empty_char: str, character for empty portion of bar (default: ' ')
    - filled_char: str, character for filled portion of bar (default: '#')
    - expected_size: int, override length detection (default: None)
    - every: int, update frequency - update every N items (default: 1)
    
    Yields:
    items from the wrapped iterable
    """

class Bar:
    def __init__(self, label='', width=32, hide=None, empty_char=' ', filled_char='#', expected_size=None, every=1):
        """
        Manual progress bar with customizable appearance and timing.
        
        Parameters:
        - label: str, label to display before progress bar (default: '')
        - width: int, width of progress bar in characters (default: 32)
        - hide: bool, force hide progress bar (default: None, auto-detect TTY)
        - empty_char: str, character for empty portion of bar (default: ' ')
        - filled_char: str, character for filled portion of bar (default: '#')
        - expected_size: int, total number of items expected (default: None)
        - every: int, update frequency - update every N calls (default: 1)
        """
    
    def show(self, progress, count=None):
        """
        Display progress bar at given progress level.
        
        Parameters:
        - progress: int, current progress value
        - count: int, optional override for expected_size
        """
    
    def done(self):
        """
        Complete the progress bar and show final state with elapsed time.
        Automatically called when using Bar as context manager.
        """
    
    def __enter__(self):
        """Context manager entry."""
    
    def __exit__(self, exc_type, exc_val, exc_tb):
        """Context manager exit - calls done() automatically."""

def dots(it, label='', hide=None, every=1):
    """
    Progress iterator that prints a dot for each item being iterated.
    
    Parameters:
    - it: iterable, items to iterate over
    - label: str, label to display before dots (default: '')
    - hide: bool, force hide dots (default: None, auto-detect TTY)
    - every: int, print dot every N items (default: 1)
    
    Yields:
    items from the wrapped iterable
    """

def mill(it, label='', hide=None, expected_size=None, every=1):
    """
    Progress iterator that prints a mill/spinner while iterating.
    
    Parameters:
    - it: iterable, items to iterate over
    - label: str, label to display before spinner (default: '')
    - hide: bool, force hide spinner (default: None, auto-detect TTY)
    - expected_size: int, override length detection (default: None)
    - every: int, update spinner every N items (default: 1)
    
    Yields:
    items from the wrapped iterable
    """

from clint.textui.progress import bar, dots, mill, Bar
import time

# Basic progress bar with iterator
items = range(100)
for item in bar(items, label='Processing: '):
    time.sleep(0.1)  # Simulate work
    # Process item

# Custom progress bar appearance
for item in bar(items, label='Custom: ', width=50, 
                filled_char='█', empty_char='░'):
    time.sleep(0.05)
    # Process item

# Manual progress bar
with Bar(label='Manual Progress: ', expected_size=100) as progress_bar:
    for i in range(100):
        # Do some work
        time.sleep(0.05)
        progress_bar.show(i + 1)

# Dots progress indicator
large_dataset = range(1000)
for item in dots(large_dataset, label='Loading data', every=10):
    # Process item (prints dot every 10 items)
    pass

# Mill/spinner for unknown progress
unknown_items = some_generator()
for item in mill(unknown_items, label='Processing: '):
    # Process item with spinner
    pass

from clint.textui.progress import Bar, bar
import requests

# Download progress with actual size
def download_file(url, filename):
    response = requests.get(url, stream=True)
    total_size = int(response.headers.get('Content-Length', 0))
    
    with open(filename, 'wb') as f:
        with Bar(label=f'Downloading {filename}: ', 
                 expected_size=total_size) as progress_bar:
            downloaded = 0
            for chunk in response.iter_content(chunk_size=8192):
                if chunk:
                    f.write(chunk)
                    downloaded += len(chunk)
                    progress_bar.show(downloaded)

# Nested progress bars for complex operations
def process_files(file_list):
    for file_path in bar(file_list, label='Files: '):
        with open(file_path, 'r') as f:
            lines = f.readlines()
            
        # Process each line with its own progress bar
        processed_lines = []
        for line in bar(lines, label=f'  {file_path}: ', width=20):
            # Process line
            processed_line = line.strip().upper()
            processed_lines.append(processed_line)
            time.sleep(0.01)

# Custom update frequency for performance
huge_dataset = range(1000000)
for item in bar(huge_dataset, label='Big data: ', every=1000):
    # Only update progress every 1000 items for better performance
    pass

# Progress bar with error handling
def safe_processing(items):
    progress_bar = Bar(label='Safe processing: ', expected_size=len(items))
    
    try:
        for i, item in enumerate(items):
            try:
                # Process item that might fail
                result = risky_operation(item)
                progress_bar.show(i + 1)
            except Exception as e:
                # Handle individual item errors
                print(f"Error processing item {i}: {e}")
                continue
    finally:
        progress_bar.done()

# Conditional progress display
def process_with_conditional_progress(items, show_progress=True):
    if show_progress:
        iterator = bar(items, label='Processing: ')
    else:
        iterator = items
    
    for item in iterator:
        # Process item
        pass

# Force progress display even when piped
for item in bar(items, hide=False):
    pass

# High-performance mode with reduced updates
for item in bar(huge_list, every=100, label='Fast: '):
    pass

# Custom appearance
for item in bar(items, filled_char='●', empty_char='○', width=60):
    pass