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Beginner 9
01

What are the key differences between `os.path` and `pathlib` modules for file operations?

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The os.path module uses string-based operations while pathlib provides object-oriented path handling. pathlib is more modern, readable, and cross-platform compatible.

Key differences:

  • os.path: String-based, requires multiple function calls
  • pathlib: Object-oriented, chainable methods, more intuitive
# os.path approach
import os
path = os.path.join('home', 'user', 'documents', 'file.txt')
if os.path.exists(path):
    size = os.path.getsize(path)

# pathlib approach
from pathlib import Path
path = Path('home') / 'user' / 'documents' / 'file.txt'
if path.exists():
    size = path.stat().st_size
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02

How would you recursively find all files with a specific extension in a directory tree?

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You can use os.walk(), glob.glob(), or pathlib.Path.rglob(). Each has different advantages for automation scripts.

# Using pathlib (recommended)
from pathlib import Path

def find_files_by_extension(directory, extension):
    return list(Path(directory).rglob(f'*.{extension}'))

# Using glob
import glob
files = glob.glob('/path/**/*.py', recursive=True)

# Using os.walk
import os
def find_files_walk(directory, extension):
    files = []
    for root, dirs, filenames in os.walk(directory):
        for filename in filenames:
            if filename.endswith(f'.{extension}'):
                files.append(os.path.join(root, filename))
    return files
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03

Explain the difference between text and binary file modes. When would you use each?

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Text mode handles encoding/decoding and line endings automatically, while binary mode works with raw bytes. Choice depends on file content and automation requirements.

  • Text mode ('r', 'w'): For human-readable files (logs, configs, CSVs)
  • Binary mode ('rb', 'wb'): For executables, images, encrypted files, or when exact byte control is needed
# Text mode - automatic encoding handling
with open('config.txt', 'r', encoding='utf-8') as f:
    content = f.read()  # Returns string

# Binary mode - raw bytes
with open('backup.tar.gz', 'rb') as f:
    content = f.read()  # Returns bytes
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04

How do you monitor system resources (CPU, memory, disk) using Python?

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Use psutil for comprehensive system monitoring. It provides cross-platform system information essential for automation monitoring.

import psutil

def get_system_info():
    return {
        'cpu_percent': psutil.cpu_percent(interval=1),
        'memory': psutil.virtual_memory()._asdict(),
        'disk': psutil.disk_usage('/')._asdict(),
        'network': psutil.net_io_counters()._asdict()
    }

# Monitor with thresholds
def check_system_health():
    cpu = psutil.cpu_percent(interval=1)
    memory = psutil.virtual_memory().percent
    
    alerts = []
    if cpu > 80:
        alerts.append(f"High CPU usage: {cpu}%")
    if memory > 85:
        alerts.append(f"High memory usage: {memory}%")
    
    return alerts
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05

How do you parse and analyze log files efficiently in Python?

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06

How do you make HTTP requests reliably in automation scripts?

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07

How would you check network connectivity and service availability in automation scripts?

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08

How do you handle configuration files in Python automation scripts?

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09

How do you implement scheduled tasks in Python?

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Intermediate 16
10

How do you safely handle file operations in automation scripts to prevent resource leaks?

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11

What's the difference between `os.system()`, `subprocess.run()`, and `subprocess.Popen()`?

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12

How do you monitor and manage running processes programmatically?

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13

How would you implement a process timeout in a Python automation script?

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14

How would you create a system health monitoring script that sends alerts?

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15

How do you monitor log files in real-time for automation purposes?

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16

How would you implement log rotation in a Python application?

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17

How do you handle API rate limiting in automation scripts?

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18

How do you securely handle sensitive configuration data?

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19

How do you implement comprehensive error handling in automation scripts?

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20

How do you handle timeouts and retries in automation scripts?

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21

How do you implement caching in automation scripts?

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22

How do you implement secure practices in Python automation scripts?

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23

How do you validate and sanitize user inputs in automation scripts?

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24

How do you build and consume REST APIs for automation purposes?

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25

How do you handle database operations in Python automation scripts?

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Expert 5
26

How would you implement a robust task queue system?

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27

How do you optimize Python scripts for large-scale automation tasks?

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28

How do you automate cloud infrastructure using Python?

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29

How do you implement infrastructure monitoring and alerting?

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30

How do you implement automated deployment and rollback strategies?

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