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Top 30 Python Interview Questions & Answers<\/b><\/span><\/p>\n 1) What is Python? What are the benefits of using Python?<\/b><\/span><\/p>\n Python is a programming language with objects, modules, threads, exceptions and automatic 2) What is PEP 8?<\/b><\/span><\/p>\n PEP 8 is a coding convention, a set of recommendation, about how to write your Python code 3) What is pickling and unpickling?<\/b><\/span><\/p>\n Pickle module accepts any Python object and converts it into a string representation and dumps 4) How Python is interpreted?<\/b><\/span><\/p>\n Python language is an interpreted language. Python program runs directly from the source 5) How memory is managed in Python?<\/b><\/span><\/p>\n . <\/b><\/span>Python memory is managed by Python private heap space. All Python objects and data . <\/b><\/span>The allocation of Python heap space for Python objects is done by Python memory . <\/b><\/span>Python also have an inbuilt garbage collector, which recycle all the unused memory and 6) What are the tools that help to find bugs or perform static analysis?<\/b><\/span><\/p>\n PyChecker is a static analysis tool that detects the bugs in Python source code and warns 7) What are Python decorators?<\/b><\/span><\/p>\n A Python decorator is a specific change that we make in Python syntax to alter functions easily<\/p>\n 8) What is the difference between list and tuple?<\/b><\/span><\/p>\n The difference between list and tuple is that list is mutable while tuple is not. Tuple can be 9) How are arguments passed by value or by reference?<\/b><\/span><\/p>\n Everything in Python is an object and all variables hold references to the objects. The 10) What is Dict and List comprehensions are?<\/b><\/span><\/p>\n They are syntax constructions to ease the creation of a Dictionary or List based on existing 11) What are the built-in type does python provides?<\/b><\/span><\/p>\n There are mutable and Immutable types of Pythons built in types Mutable built-in types<\/p>\n .<\/b><\/span> List <\/p>\n . <\/b>Sets <\/p>\n . <\/b>Dictionaries<\/p>\n Immutable built-in types<\/p>\n . <\/b>Strings <\/p>\n . <\/b>Tuples <\/p>\n . <\/b>Numbers<\/p>\n 12) What is namespace in Python?<\/b><\/span><\/p>\n In Python, every name introduced has a place where it lives and can be hooked for. This is 13) What is lambda in Python?<\/b><\/span><\/p>\n It is a single expression anonymous function often used as inline function.<\/p>\n 14) Why lambda forms in python does not have statements?<\/b><\/span><\/p>\n A lambda form in python does not have statements as it is used to make new function object 15) What is pass in Python?<\/b><\/span><\/p>\n Pass means, no-operation Python statement, or in other words it is a place holder in compound 16) In Python what are iterators?<\/b><\/span><\/p>\n In Python, iterators are used to iterate a group of elements, containers like list.<\/p>\n 17) What is unit test in Python?<\/b><\/span><\/p>\n A unit testing framework in Python is known as unittest. It supports sharing of setups, 18) In Python what is slicing?<\/b><\/span><\/p>\n A mechanism to select a range of items from sequence types like list, tuple, strings etc. is 19) What are generators in Python?<\/b><\/span><\/p>\n The way of implementing iterators are known as generators. It is a normal function except that 20) What is docstring in Python?<\/b><\/span><\/p>\n A Python documentation string is known as docstring, it is a way of documenting Python<\/p>\n functions, modules and classes.<\/p>\n 21) How can you copy an object in Python?<\/b><\/span><\/p>\n To copy an object in Python, you can try copy.copy () or copy.deepcopy() for the general case. 22) What is negative index in Python?<\/b><\/span><\/p>\n Python sequences can be index in positive and negative numbers. For positive index, 0 is the 23) How you can convert a number to a string?<\/b><\/span><\/p>\n In order to convert a number into a string, use the inbuilt function str(). If you want a octal or 24) What is the difference between Xrange and range?<\/b><\/span><\/p>\n Xrange returns the xrange object while range returns the list, and uses the same memory and 25) What is module and package in Python?<\/b><\/span><\/p>\n In Python, module is the way to structure program. Each Python program file is a module, which The folder of Python program is a package of modules. A package can have modules or 26) Mention what are the rules for local and global variables in Python?<\/b><\/span><\/p>\n Local variables:<\/b> If a variable is assigned a new value anywhere within the function’s body, it’s Global variables:<\/b> Those variables that are only referenced inside a function are implicitly 27) How can you share global variables across modules?<\/b><\/span><\/p>\n To share global variables across modules within a single program, create a special module. 28) Explain how can you make a Python Script executable on Unix?<\/b><\/span><\/p>\n To make a Python Script executable on Unix, you need to do two things, <\/p>\n . <\/b><\/span>Script file’s mode must be executable and <\/p>\n . <\/b>the first line must begin with # ( #!\/usr\/local\/bin\/python)<\/p>\n 29) Explain how to delete a file in Python?<\/span><\/b><\/p>\n By using a command os.remove (filename) or os.unlink(filename)<\/p>\n 30) Explain how can you generate random numbers in Python?<\/b><\/span><\/p>\n To generate random numbers in Python, you need to import command as<\/p>\n import random <\/p>\n random.random() <\/p>\n This returns a random floating point number in the range [0,1)<\/p>\n","protected":false},"excerpt":{"rendered":" Top 30 Python Interview Questions & Answers 1) What is Python? 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\nmemory management. The benefits of pythons are that it is simple and easy, portable,
\nextensible, build-in data structure and it is an open source.<\/p>\n
\nmore readable. <\/p>\n
\nit into a file by using dump function, this process is called pickling. While the process of
\nretrieving original Python objects from the stored string representation is called unpickling.<\/p>\n
\ncode. It converts the source code that is written by the programmer into an intermediate
\nlanguage, which is again translated into machine language that has to be executed.<\/p>\n
\nstructures are located in a private heap. The programmer does not have an access to
\nthis private heap and interpreter takes care of this Python private heap.<\/p>\n
\nmanager. The core API gives access to some tools for the programmer to code.<\/p>\n
\nfrees the memory and makes it available to the heap space.<\/p>\n
\nabout the style and complexity of the bug. Pylint is another tool that verifies whether the module
\nmeets the coding standard.<\/p>\n
\nhashed for e.g as a key for dictionaries.<\/p>\n
\nreferences values are according to the functions; as a result you cannot change the value of the
\nreferences. However, you can change the objects if it is mutable.<\/p>\n
\niterable.<\/p>\n
\nknown as namespace. It is like a box where a variable name is mapped to the object placed.
\n Whenever the variable is searched out, this box will be searched, to get corresponding object.<\/p>\n
\nand then return them at runtime.<\/p>\n
\nstatement, where there should be a blank left and nothing has to be written there.<\/p>\n
\nautomation testing, shutdown code for tests, aggregation of tests into collections etc.<\/p>\n
\nknown as slicing.<\/p>\n
\nit yields expression in the function.<\/p>\n
\nYou cannot copy all objects but most of them.<\/p>\n
\nfirst index, 1 is the second index and so forth. For negative index, (-1) is the last index and (-2)
\nis the second last index and so forth.<\/p>\n
\nhexadecimal representation, use the inbuilt function oct() or hex().<\/p>\n
\nno matter what the range size is.<\/p>\n
\nimports other modules like objects and attributes.<\/p>\n
\nsubfolders.<\/p>\n
\nassumed to be local.<\/p>\n
\nglobal.<\/p>\n
\nImport the config module in all modules of your application. The module will be available as a
\nglobal variable across modules.<\/p>\n