OpenEDG PCEA — Certified Entry-Level Automation Engineer with Python

Which Python module provides access to command-line arguments passed to a script?

• Aos
• Bsys
• Cargparse
• Dplatform

What does the following script print when run as `python script.py hello world`? ```python import sys print(len(sys.argv)) ```

• A1
• B2
• C3
• D4

Which argparse method registers a positional argument named 'filename'?

• Aparser.add_option('filename')
• Bparser.add_argument('filename')
• Cparser.add_positional('filename')
• Dparser.register('filename')

What is the primary benefit of automation that drives ROI calculations?

• AEliminating all human jobs
• BReducing repetitive manual effort and error rates
• CReplacing the operating system
• DIncreasing CPU usage

How do you set an environment variable in Python and read it back?

• Aos.environ['KEY'] = 'value'; os.environ.get('KEY')
• Bsys.env['KEY'] = 'value'; sys.env['KEY']
• Cenv.set('KEY', 'value'); env.get('KEY')
• Dos.setenv('KEY', 'value'); os.getenv('KEY')

What exit code conventionally indicates a successful script run?

• A1
• B0
• C-1
• D255

Which statement reads a JSON file into a Python dictionary?

• Ajson.read('file.json')
• Bwith open('file.json') as f: data = json.load(f)
• Cdata = json.parse(open('file.json'))
• Ddata = open('file.json').as_json()

What is the result of this code? ```python import json data = {'name': 'Alice', 'age': 30} print(json.dumps(data)) ```

• A{'name': 'Alice', 'age': 30}
• B{"name": "Alice", "age": 30}
• C[name=Alice, age=30]
• DTypeError

Which statement is true about Python's `with` statement when used for file handling?

• AIt is required only for writing files
• BIt automatically closes the file even if an exception occurs
• CIt loads the entire file into memory
• DIt only works with text files

Which of the following is the correct way to define a function with a default parameter?

• Adef greet(name = 'World'): print(name)
• Bdef greet(name := 'World'): print(name)
• Cdef greet(name == 'World'): print(name)
• Ddef greet(name: 'World'): print(name)

Which os module function returns a list of files and directories in a given path?

• Aos.list()
• Bos.listdir()
• Cos.dir()
• Dos.scan()

What does `os.walk('/data')` yield on each iteration?

• AA single file path string
• BA tuple of (dirpath, dirnames, filenames)
• CA dict of file metadata
• DA list of subdirectories only

Which function creates a directory and any necessary intermediate directories?

• Aos.mkdir(path)
• Bos.makedirs(path)
• Cos.create_dir(path)
• Dos.path.mkdir(path)

What does this code do? ```python from pathlib import Path p = Path('/var/log') for f in p.glob('*.log'): print(f.name) ```

• APrints all files recursively under /var/log
• BPrints only .log files in /var/log (non-recursive)
• CRenames all .log files
• DDeletes all .log files

Which pathlib method recursively searches all subdirectories?

• APath.glob()
• BPath.rglob()
• CPath.recursive()
• DPath.find()

How do you read the entire contents of a file as text using pathlib?

• APath('file.txt').read()
• BPath('file.txt').read_text()
• CPath('file.txt').open().read()
• DBoth B and C

Which shutil function recursively copies an entire directory tree?

• Ashutil.copy()
• Bshutil.copy2()
• Cshutil.copytree()
• Dshutil.move()

What is the difference between `shutil.copy()` and `shutil.copy2()`?

• Acopy2 is faster than copy
• Bcopy2 preserves file metadata (timestamps, permissions); copy does not
• Ccopy2 supports directories; copy does not
• DThere is no difference

Which function safely removes an entire directory tree (including non-empty directories)?

• Aos.rmdir()
• Bos.remove()
• Cshutil.rmtree()
• Dpathlib.Path.unlink()

Which shutil function creates a ZIP archive of a directory?

• Ashutil.zip()
• Bshutil.archive()
• Cshutil.make_archive('out', 'zip', 'src_dir')
• Dshutil.compress('src_dir', 'zip')

Which pathlib expression checks whether a path points to a regular file (not a directory)?

• APath('foo').exists()
• BPath('foo').is_file()
• CPath('foo').is_regular()
• DPath('foo').type() == 'file'

What does `Path('/a/b/c.txt').parent` return?

• A'/a/b/'
• BPosixPath('/a/b')
• CPosixPath('/a')
• D'c.txt'

How do you change the current working directory in Python?

• Aos.chdir('/new/path')
• Bos.cwd('/new/path')
• Cos.path.set_cwd('/new/path')
• Dsys.cwd = '/new/path'

Which method renames a file or directory?

• Aos.move(src, dst)
• Bos.rename(src, dst)
• Cos.relabel(src, dst)
• Dos.cp(src, dst)

What does this code accomplish? ```python from pathlib import Path for f in Path('.').rglob('*.tmp'): f.unlink() ```

• ARenames all .tmp files
• BDeletes all .tmp files in the current directory and subdirectories
• CLists all .tmp files
• DCreates new .tmp files

How do you check whether an environment variable is set without raising an exception?

• Aos.environ['KEY']
• Bos.environ.get('KEY')
• Cos.environ.has('KEY')
• Dos.getenv['KEY']

What is the recommended way in modern Python to construct a cross-platform file path?

• AUse string concatenation with '/'
• BUse os.path.join() or pathlib.Path
• CAlways use backslash on Windows, forward slash on Linux
• DUse sys.path.join()

Which expression returns the file size in bytes using pathlib?

• APath('f.txt').size
• BPath('f.txt').stat().st_size
• CPath('f.txt').filesize()
• DPath('f.txt').len()

What does `os.path.expanduser('~/data')` return on Linux for user 'alice'?

• A'/home/alice/data'
• B'~/data'
• C'/root/data'
• D'/data'

What does Path's `/` operator do?

• ADivides one path by another
• BJoins paths together (analogous to os.path.join)
• CCompares two paths
• DRemoves a path component

What does this regex code return? ```python import re m = re.search(r'\d+', 'abc 123 def 456') print(m.group()) ```

• A'123 456'
• B'123'
• C'456'
• D['123', '456']

Which re function returns ALL non-overlapping matches as a list of strings?

• Are.match()
• Bre.search()
• Cre.findall()
• Dre.compile()

What does `re.sub(r'\s+', ' ', text)` do?

• ARemoves all whitespace
• BReplaces sequences of whitespace with a single space
• CAdds extra whitespace
• DSplits text on whitespace

Which regex pattern matches a basic email address?

• Ar'\w+@\w+'
• Br'[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}'
• Cr'[email]+'
• Dr'\d+@\d+'

What does `(?P<year>\d{4})` mean in a Python regex?

• AA non-capturing group of 4 digits
• BA named capturing group called 'year' that matches 4 digits
• CA lookahead for the word 'year'
• DA backreference to group 'year'

How do you read a CSV file into a list of dictionaries?

• Acsv.DictReader(open('f.csv'))
• Bcsv.read('f.csv', as_dict=True)
• Ccsv.parse('f.csv', dict=True)
• Dcsv.dict('f.csv')

Which library is the standard choice for reading and writing .xlsx Excel files in pure Python?

• Axlrd
• Bopenpyxl
• Ccsv
• Dxlsx-py

How do you read cell A1 from the active sheet of an openpyxl workbook?

• Awb.cell('A1').value
• Bwb.active['A1'].value
• Cwb.sheets[0].read('A1')
• Dwb.read_cell(1, 1)

Which library is commonly used to extract text from PDF files in Python?

• Apypdf
• Bpdfwriter
• Cpdfreader-only
• Dcsv

What does this code do? ```python import csv with open('out.csv', 'w', newline='') as f: writer = csv.writer(f) writer.writerow(['name', 'age']) writer.writerows([['Alice', 30], ['Bob', 25]]) ```

• AReads a CSV
• BWrites a CSV with one header row and two data rows
• CAppends to an existing CSV
• DValidates a CSV

Which regex flag makes the pattern case-insensitive?

• Are.MATCH
• Bre.IGNORECASE (or re.I)
• Cre.CASELESS
• Dre.NOCASE

What is the difference between re.match() and re.search()?

• Amatch() is faster than search()
• Bmatch() only matches at the beginning of the string; search() scans the entire string
• Cmatch() returns a list; search() returns a string
• DThere is no difference

How do you safely escape user input before embedding it in a regex?

• Are.quote(user_input)
• Bre.escape(user_input)
• Cre.safe(user_input)
• Dstring.escape(user_input)

Which openpyxl method saves a workbook to disk?

• Awb.write('out.xlsx')
• Bwb.save('out.xlsx')
• Cwb.commit()
• Dwb.flush()

What does `pandas.read_csv('data.csv')` return?

• AA list of strings
• BA DataFrame
• CA dict
• DA NumPy array

Which regex pattern is a positive lookahead asserting that 'foo' is followed by 'bar'?

• Afoo(?<=bar)
• Bfoo(?=bar)
• Cfoo(?!bar)
• Dfoo(?<!bar)

When iterating a CSV with csv.reader, what type is each row?

• Adict
• Blist of strings
• Ctuple of integers
• Dcsv.Row object