Python Regular Expressions Set-I
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Questions and Answers

What does the function re.match do in Python?

  • None of the mentioned
  • Matches a pattern at the start of the string (correct)
  • Such a function does not exist
  • Matches a pattern at any position in the string

    • What does the following regular expression match: http[s]?://.+?

  • 'https://' followed by one or more characters
  • 'http://' or 'https://' followed by one or more characters (correct)
  • 'http://' or 'http[s]://' followed by one or more character
  • Exact match to 'http[s]?://.+'

    • Which protocol can be used to retrieve web pages using Python?

  • bs4
  • HTTP
  • GET
  • urllib (correct)

    • What is DOM in the context of web programming?

    <p>Document Object Model</p> Signup and view all the answers

    Which module in Python supports regular expressions?

    <p>re</p> Signup and view all the answers

    What does the function re.match do?

    <p>matches a pattern at the start of the string</p> Signup and view all the answers

    Which of the following creates a pattern object?

    <p>re.compile(str)</p> Signup and view all the answers

    The process of pickling in Python includes:

    <p>conversion of a Python object hierarchy into byte stream</p> Signup and view all the answers

    What is the purpose of the 'pickle' module in Python?

    <p>To serialize and deserialize objects</p> Signup and view all the answers

    Which Python command is used to serialize an object using the 'pickle' module?

    <p>pickle.dump</p> Signup and view all the answers

    What type of error does the 'pickle' module raise when encountering an unpicklable object?

    <p>pickle.PicklingError</p> Signup and view all the answers

    What is the function of 'getstate()' in Python's 'pickle' module?

    <p>It is called when pickling an object for serialization</p> Signup and view all the answers

    Study Notes

    Regular Expressions in Python

    • The re.match function in Python searches the string for a match against the regular expression, and returns a match object if the string matches the pattern.
    • The regular expression http[s]?://.+? matches a URL that starts with http or https, followed by ://, and then any characters (the .+? is a lazy match for any characters).

    Web Programming in Python

    • The http protocol can be used to retrieve web pages using Python.
    • DOM (Document Object Model) in the context of web programming represents a document as a tree of nodes, allowing programmers to interact with the document's structure and content.

    Python Modules

    • The re module in Python supports regular expressions.
    • The pickle module in Python is used for serialization and deserialization of Python objects.

    Pickling in Python

    • The process of pickling in Python includes serializing an object into a byte stream, and then deserializing it back into an object.
    • The purpose of the pickle module is to serialize Python objects into a byte stream, and then reconstruct them later.
    • The Python command pickle.dump() is used to serialize an object using the pickle module.
    • The pickle module raises a PicklingError when encountering an unpicklable object.
    • The __getstate__() function in Python's pickle module is used to customize the pickling process by returning a dictionary of the object's state.

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    Quiz Team

    Description

    Test your knowledge of Python regular expressions by choosing the correct alternatives and predicting the output of Python code snippets. This set covers concepts like re.search function and usage of re.match in Python.

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