Python Interview Questions and Answer Part – 1

What Python function is used to open files?

• open_file()
• file()
• new_file()
• open() (Ans)

What does the pass keyword do?

• Passes control to another function
• Continues to the next iteration of a loop
• it is a no-op (Ans)
• Raises an exception

What are with-blocks used for?

• Writing to files
• Defining functions
• Resource management (Ans)
• Looping over sequences

Which one of the following is true?

• If present, the module docstring must begin on the first non-empty line in the module
• The first statement in the module must be an import statement
• If present, the shebang comment must be the first non-empty line in the module (Ans)

What does the in operator do for lists?

• Inserts an element in to the list
• Runs a function for each element in the list
• Duplicates the list
• Checks for membership of a value (Ans)

What is the standard package that provides support for building and installing additional modules into a Python installation?

• fixture
• pkgutils
• palindrome
• distutils (Ans)

Where must keyword arguments come when calling a function?

• Before positional arguments
• After the closing parenthesis
• They can appear anywhere
• After positional arguments (Ans)

Python source files can contain multiple classes.

• False
• True (Ans)

The control flow construct for nested conditionals uses which form:

• elif: (Ans)
• else if:
• elsif:
• elseif:

What does a comprehension’s filtering predicate do?

• Prevents certain values from going into the collection (Ans)
• Modifies the values going into the collection
• Allows sets to contain duplicates
• Determines the actual type of collection constructed

Can classes have docstrings?

• Yes (Ans)
• No

Why is the first command line argument in sys.argv[1]

• Because Python lists use one-based indexing
• Because the program filename is in sys.argv [0] (Ans)
• Because the program module name is in sys.argv[0]

What does the LEGB acronym stand for?

• Local, Enclosing, Global, Built-in (Ans)
• Lookup, Enable, Gateway, Backup
• Link, Extension, Generic, Binary
• Local, Embedded, Global, Built-in

The REPL always displays the value of the entered expression.

• False (Ans)
• True

How do you define a test function on a TestCase?

• Manually add it to the test_functions list
• Start the function name with test_ (Ans)
• Add the word test-function to the function’s docstring
• End the function name with _test

How do you replace an element in a list?

• the square-bracket operator (Ans)
• the cons() method
• the replace() method
• you can’t because lists are immutable

What does the global keyword do?

• Declares a function as global
• Defines a global variable
• Allows assignment to globals in a function (Ans)
• Exports functions from a namespace

Copying a list does a deep copy of the list’s.

• True
• False (Ans)

How is iteration termination signalled in Python?

• With a special end token
• By raising an IndexError exception
• By raising the StopIteration exception (Ans)
• By calling a user-provided callback function

Why should you follow existing patterns when choosing exception types?

• To improve program performance
• To simplify integration of your code (Ans)
• To avoids SyntaxErrors
• To avoid documenting your APIs

When is top level module code executed?

• Only the first time a module is imported (Ans)
• Every time the module is imported

What is the Python 3.3 tool for creating virtual environments?

• create_env
• virtenv
• pyvenv (Ans)
• makeenv

Which pdb function will stop program execution?

• pdb.set_trace() (Ans)
• pdb.break()
• pdb.debug()
• pdb.halt()

Rajesh Kumar

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